Document 2yXR45JbOL5jY1bqN09n65gR

fr V it i FILE COPY DO i ( VC BRIEFING REPORT DRAFT rr DO NOT QUOTE OR CITE External Review Draft ENVIRONMENTAL ASPECTS OF VINYL/POLYVINYL CHLORIDE KtUJVtU DEC 311974 WHEELER, Jd notice TWs fa a T hat Kirill' t!1 \ rf at <t'f ft)*p t, ~f * i* tn t A tarry pnHcy. It i* cirru'a^td 'rrr.rrart on fta technical accuracy and pol'cy iTftHcationa. V U.SC ENVIRONMENTAL PROTECTION AGENCY NATIONAL ENVIRONMENTAL RESEARCH CENTER RESEARCH TRIANGLE PARK, NCfilH CAROLINA 27711 October Is; 1974 ) ucc 011647 4 PREFACE M f- _ This report was prepared by a Task Force convened under the direction of Dr. John F. Finklea, Director, National Environmental Research Center (NERC) in June, 1974. In a preliminary assessment of the environmental problems associated with vinyl chloride and polyvinyl chloride, an EPA Task Force under the direction of the Office of Toxic Substances deter mined that emissions of vinyl chloride monomer was primarily an air pollution problem. Accordingly, the Office of Air and Solid Waste was given the responsibility for an in-depth evaluation of the problem. This report was proposed as a part of this evaluation. The objective was to review and evaluate the current knowledge of vinyl chloride and polyvinyl chloride emissions into the environment as related to possible deleterous effects upon human health and welfare. The units of parts per million (ppm), in lieu of metric units, have been used in this report to be consistent with other agencies currently involved In the national assessment of the vinyl chloride problem. The following members served directly on or contributed to the NERC Task Force. James R. Smith, Chairman NERC/RTP Anthony V. Cflucci Gordon Ortman Kenneth Brldbord Paul E. Brubaker J. Bufallni David Coffin R. Boksleitner J.E. Davis D. Denny ` Jean French J.H.B. Garner OAqps Bruce Turner Choudari Konmlneni B. Lonneman F.P. Scaringelli Jo Cooper John Crenshaw Mike Jones NIEHS R. Drew ORD.-fflT R. McGaughy UCC 011648 DRAFT DO NO I DUO I E 00 C!T TABLE OF CONTENTS PREFACE ' 1. SUMMARY, AND CONCLUSIONS 1.1 SUMMARY............................... 1.2 CONCLUSIONS.......................... 2. INTRODUCTION.......................... -............................. 3 CHEMICAL AND PHYSICAL PROPERTIES.................. 3.1 Physical PROPERTIES......................................... 3.2 CHEMICAL PROPERTIES......................................... 4. MEASUREMENT TECHNIQUES..................................... 4.1 ENVIRONMENTAL AIR--......................................... 4.2 REFERENCES...................................................... -- 5. ENVIRONMENTAL APPRAISAL................................... 5.1 SOURCES................................................................... 5.2 OVERVIEW OF PROCESSES..................................... 5-3 CONCENTRATIONS-.................................................. 5.4 ESTIMATES OF AIR QUALITY CONCENTRATIONS 5.5 TRANSFORMATION, TRANSPORT, AND REMOVAL- 6. ENVIRONMENTAL EXPOSURE AND RECEPTOR RISK 7. UNDESIRABLE EFFECTS FROM VINYL CHLORIDE 7.1 ANIMALS..........-.................................................. 7.2 THRESHOLD LIMIT VALUES............................... 7.3 HUMAN EFFECTS.................................................. 7.4 ECOLOGY............................................................... 7.5 VINYL CHLORIDE IN PERSPECTIVE................ 8. CONTROL TECHNOLOGY AND REMEDIAL ACTIONS APPENDIX A............................................................ APPENDIX B............................................................ uco 011649 / DRAFT DO NOT QUOTE 00 CITE 1. SUMMARY AND CONCLUSIONS 1.1 SUMMARY This report represents^a review and evaluation of the available current scientific data relative to the health and welfare Implications of envlronI mental pollution resulting from the production and use of vinyl chloride and polyvinyl chloride. New Information about this compound has become available and Important new data may be forthcoming In the near future. Vinyl chloride monomer (VCM) was first synthesized In 1837. The vinyl chloride monomer Is a synthetic chemical derived from petrochemical feedstock and chlorine. Its principal use Is In the production of a wide variety of useful plastic materials such as floor tile, phonograph records, pipes and electrical Insulation, although It has also been used In other ways, for example, as an aerosol propellant. The pro duction of vlpyl chloride began In the United States In the 1930's, the first Important use was In the manufacture of synthetic rubber. Production x ft* levels Increased rapidly after World War II--the beginning of the Industrial chemical era which has produced over 20,000 new chemical, products, yinvl chloride production In the U.S. was less than 45 million kilograms (kg) In 1943 but exceeded 2.9 billion kg In 1973. The annual growth rate In *&1s Industry Is expected to exceed 10 percent per year thmunh the 1980 s. In the United States vinyl chloride monomer Is produced at 15 plants and polyvinyl chloride (PVC) Is produced at 37 plants. ./ UCC 011650 DRAFT DO NOT QUOTE Ci! CITE Approximately 1500 workers are engaged in the production of vinyl chloride, and approximately 5000 are engaged In the production of polyy^ vinyl chloride. The demand for products and components manufactured from polyvinyl chloride Is extensive due to Its widespread use, thus the Impact of control actions will be felt beyond the VCM/PVC Industry. Thousands of companies, large and small, and hundreds of thousands of workers are engaged In the manufacture of and/or use of plastic products made from PVC. Only a very limited amount of VCM emission data from Industrial sources Is available. VCM loss estimates of approximately 6 percent have been reported, based primarily on materiel balance studies. Losses to the ? outdoor atmospheres from Industrial sources may occur at a large number of points In the manufacturing processes and will vary depending upon the manufacturing facility. :Ov x Currently, emissions of vinyl chloride from VCM and PVC plants are estimated to exceed 90 million kg annually. It Is estimated that 90 percent of all vinyl chloride atmospheric emissions are believed to emanate from nnlyvlnyl chloride olantsi. Monomer plants emit less than 10 percent of the total. / Emissions of VCM from fabricating plants and from fabricated products may also occur, but at present there are no data to quantify what those emissions may be. The concentration of residual monomer In PVC powder that Is fabricated into final products Is an Important determinant o* ',rM -<"*ss1nns In both these cases, ugltlve emissions contribute a significant fraction to total VCM emissions, parti cularly in PVC plants, and these emissions are an important limiting factor In determining the degree of emissions control that can be achieved. ucc 011651 Technology may currently be available to reduce vinyl chloride emissions from VCM plants by as much as 90 percent and from PVC olants by as much as 75 percent. Control of emissions from PVC plants is a more difficult problem which may require complex process changes. Means of controlling emissions from PVC plants and .from fabrication processes are yet to be determined. Polyvinyl chloride plastics usually are not readily biodegradable. Incineration (without scrubbing) of polyvinyl chloride plastics results in the emission of hydrogen chloride gas, but not VCM. Experimental studies indicate that vegetational injury symptoms for ethylene and vinyl chloride are identical; however, no known information showing vegetational damage around VCM manufacturing or processing plants exists. Vinyl chloride is a chlorinated olefinlc hydrocarbon monomer which is a gas at ambient temperatures and atmospheric pressure. It is normally shipped and stored as a liquid under pressure. It is flanmable, explosive, and only slightly soluble in water. VCM is about two times heavier than air. Analysis of vinyl chloride usually reveals trace amounts ^o_f.x orga nic --\ --, impurities, such as acetylene, 1,3-butadiene, methyl chloride,(vniylidine^ f and vinyl acetate. Polyvinyl chloride contains residual entrapped VCM in the parts per million range. The entrapped concentration is dependent | upon the production process and can range from 0.1 to several (5-8) thousand ppm, which can be liberated during fabrication, particularly when heated. The production of VCM/PVC Involves the_use of a wide variety of chemicals other than VCM which also may contribute to adverse health effects under occupational circumstances. UCC 011652 / f/\ l\> I 1 ^ There are few data on exposure levels of vinyl chloride in ambient air. The work place peak exposures in the past may at times have ex ceeded thousands of ppm; however, the average concentration would have been less. Limited atmosDheric'V-inyl chloride concentration measurements have been made in the vicinity [0 to 8 kilometers (km)] of VCM/PVC pro duction sources. In over 90 percent of the cases the peak concentrations have been below 1 ppm;however, one peak value (qrab sample) of 33 ppm has been observed. A few twenty-four-hour average values of 1 to 3 ppm, at distances of 0.8 to 8 km from the source, have also been measured, probably in the downwind plume, although over 90 percent of 24-hour measurements were below 1 ppm. Because of the sampling and analytical procedures used, the accuracy of these measurements may be no better than + 100%. Available atmospheric VCM data have been obtained using a variety of sampling and analytical techniques with varying degrees of sensitivity and accuracy. Consequently, the data are not directly comparable. Standard sampling and analytical procedures have not been established and practiced. Continuous monitoring methods suitable for field use are not available. Measurement methodoloav Is adequate, but has not yet been applied to the problem of atmospheric and source sampling for VCM. The nature of VCM/PVC manufacturina facilities,particularly the older plants, is such that conventional source monitoring techniques may not be applicable-- due to the discontinuous nature of emissions. Using an atmosoherlc /. ucc 011653 / p;; DO NO! mu dispersion model, estimates of VCM concentration In a downwind glume --^ Indicate that hourly Integrated concentrations of 1 to 30 ppm might be expected depending upon atmospheric wind and stability conditions. The measured values and^the values predicted by the model are the same f order of magnitude. Only limited laboratory studies have been made regarding photo chemical reactions of VCM. Vinyl chloride does undergo atmospheric reactions in the presence of nitrogen oxides and solar radiation; although the reaction rate is slower than with other hydrocarbons known to be in ? the atmosphere. Reactions products of VCM photooxidation include CO, formaldehyde, formic acid, formyl chloride and hydrogen chloride. In addition, VC may indirectly contribute to the buildup of ozone. The extent to which VCM contributes to these other components in photochemical smog is not known. The estimated half-life of VCM in the atmosphere is about 6 hours. The principle route of human exposure to vinyl chloride is thought to be through air Inhalation, although exposure could occur from inaestion of food and water, and from skin contact. There is no evidence to indicate that vinyl chloride exists in normal drinking water, or in foods, except possibly in special cases involving leaching of VCM from wrapping and storage materials. Use of vinyl chloride as a propellant in aerosol products has also recently been discontinued so that this source of exposure, though significant in past years, is not anticipated to represent a problem in the future. Acute animal toxicity to VCM was first reported in 1938. Toxic mani festations in experimental animals and man included eye irritation, increased motor activity leading to tremor and loss of muscular ucc 011654 / DRAFT DO NOT I'Uoil ta Cilc coordination, and finally narcosis, and cardiac irregularities. Exposure J concentrations In these acute studies ranged up to 400,000 ppm for periods extending from 30 minutes to daily exposure of several hours. Short-term acute human experiments (Intermittent 5 minute exposures separated by 6 hours over a period of 3 days) with concentrations \~\ ranging up to 20,000 ppm produced acute toxic effects at levels above 8,000 ppm. Chronic toxicity effects due to VCM in experimental animals include cancer, damage to the liver, spleen, kidney, lungs, brain and nerve bundles. Some of the pathological lesions observed In these animal experiments were similar to those later observed in humans engaged in the production and handling of vinyl chloride. Our present knowledge of undesirable health effects associated with vinyl chloride exposure in man comes primarily from recent occupational observations, complemented by additional animal data. Between 1949 and 1966 an Increased incidence of excessive liver damane and acrosstool*'sis, a degenerative disease affecting bones and fingertips were reported among vinyl 0 chloride workers In Europe. Studies In Germany revealed evidence of liver pathology in an abnormally high percentage of PVC production workers with a history of employment ranging from 1.5 to 21 years, but exposure levels responsible for this damage are not known. Since early occupational health studies often reported acute toxic effects, similar to those found in the human experiments previously mentioned (dizziness, headaches, nausea, etc.), it can be assumed that peak exposure levels of several thousand ppm were experienced at times. Available air monitoring data in PVC plants during the period 1950- 1959 indicates that the highest time weighted average exposures in these facilities were in the range 120-385 ppm. Studies in Europe *6 ucc 011655 / DRAFT DO NOT CuOTE CI5 Cl it and the United States since 1966 tend to confirm the earlier findings In Europe. These studies Include observations of liver damage among workers ( not directly Involved In the actual production of PVC. The frequency and severity of liver pathology"among PVC workers has been related to the length of exposure; l.e. being most common In workers with an exposure history In excess of 10 years. In one study, the degree of.damage did not appear to decrease with Increasing Intervals of time between the last exposure and taking of biopsies. 1 To date 15 cases of liver angiosarcoma have been repprted among workers with a history of exposure to vinyl chloride in the United States and 10 such cases have been reported from Europe. Most, but not all, of these reported cases have been among workers involved directly in PVC production. Cases of liver angiosarcoma have been reported in 1 U.S. and 3 European workers exposed to VCM, but not directly Involved in PVC production. These cases suggest that exposure to vinyl chloride at lower levels than usually encountered In PVC production plants may be capable of causing liver angiosarcoma. Two community cases of liver angiosarcoma have also been ^ reported In persons whose residences were in the vicinity of Industrial VCM emission sources, which raises the question as to whether or not ambient air levels of VCM may, under certain circumstances, contribute to this disease. Additional studies are, however, necessary to confirm this possibility. Based upon the present reporting methods, angiosarcoma Is a rare form of. liver cancer in the for all practical purposes, general population, and/Is invariably fatal. The latent period for liver ' 7 ucc 011656 / angiosarcoma has been estimated at about 20 years, based upon medical records on occupational exposure cases. The levels and durations of exposure necessary to Induce liver angiosarcoma In the occupational or the general population living in the vicinity of emissions sources are not precisely known. Compared to the general population, the relative risk of liver angiosarcoma among workers exposed in the past to high levels of vinyl chloride is estimated at approximately 3,000. Such a relative risk represents a striking statistically significant difference (p <<0.01) in the frequency of liver angiosarcoma among those exposed to high levels of vinyl chloride compared to those in the general population not exposed to VC, or exposed to much lower levels. While the focus of attention has been on liver angiosarcoma, it should be noted that a number of industrial studies indicate that the risk of developing other cancers besides liver angiosarcoma, particularly lung and brain cancer, is also related to exposure to vinyl chloride. The multiple cancer risk associated with vinyl chloride also is supported by the available animal studies. Chronic toxic effects of VCM have been studied ih a variety of animal species. Angiosarcoma of the liver has been observed in rats, hamsters, and studies. mice exposed to vinyl chloride. Angiosarcoma was not observed in all animal / in two of these, rats and mice, liver angiosarcoma has been produced by exposures as low as 50 ppm. The frequency of liver angiosarcoma in experi mental animals appears to be dose-dependent above 50 ppm, but the shape of the dose-response curve below 50 ppm is not known. Duration of exposure has been shown to affect the tumor response in animals. Other damage, / * if ucc 011657 / . DRAFT DO NUT QUOTE OR CITE Including tumors of the lung, spleen.and kidneys In animals exposed to vinyl chloride, has been observed V"M/PVC workers are exposed to a variety of chemicals which may be carcinogens and/or liver toxins In addition to VCM. Such a complex exposure pattern makes It difficult to draw final conclusions regarding the specific role played by vinyl chloride In the development of liver cancer. However, the results of animal experiments demonstrating liver angiosarcoma from exposure to VCM In 3 species, coupled with occupational data Implies that vinyl chloride is a causal factor In the development of liver angiosarcoma. Although actual VCM exposure levels responsible for liver angiosarcoma and/or other cancers In man are not precisely known, limited measurements around VCM/PVC production facilities Indicate that contiguous populations are being exposed to low levels of vinyl chloride, which may Impose a health risk. The presence or importance of chemical co-factors besides vinyl chloride in the etiology of liver angiosarcoma Is not well defined, though other chemicals thorotrast and besides VCfl; l.e./arsenlcals have been associated with liver angiosarcoma In man. Health Implications relating to PVC dust particles containing well residual VCM have not been/studied. Data In animals and man for the lower end, less than 50 )pr., of th# \j VCM dose response curve are not available. Attempts to extrapolate animal T\ j ' dose response curves to define a presumed Mno-effect" level are fraught -7 ucc 011658 * *`1- *: < , i DO NCI i/'.'oit U" with problems which impact upon the state-of-the art in cancer research........I <1 tlie availability of resources required to conduct long time chronic stulies. Similarly It is difficult to extrapolate data in experimental animals directly to man who may be more or less sensitive than animals to given chei> /, structures. These problems reflect important gaps in our knowledge concerning environmentally related cancers. The mechanism for producing liver angiosarcoma by the inhalation of VC has been postulated but has not been confirmed. It is also not known whether the mechanism can be activated by intermittent peak exposures or whether frequentor essentially continuous,exposure to low concentrations is sufficient to cause cancers to develop. 1.2 CONCLUSIONS Precise data that Indicate the degree to which the general population Is exposed to vinyl chloride, and Its consequent effects, are not available. However, available data supports the following tentative conclusions: 1. Vinyl chloride In the atmosphere in the vicinity of emission sources is a potential health hf*7arf< -- 2. Occupational cases of angiosarcoma have been observed amonq PVC production workers predominantly with long-term exposure (greater than 20 years) to VCH at unknown, but suspected hfgh.concentratlons. However, cases of liver angiosarcoma have been reported among workers f exposed to VCH but not directly Involved In PVC production, raising the question of effects at lower levels of exposure. 3. Observations among workers and In experimental animals indicate that there Is a multiple cancer risk from exposure to vinyl chloride. /J ucc 011659 / and 4. The mechanism and dose-response relationships between vinyl chloride/ at community exposure levels are not known S. Persons living in the iirmediate vicinity of VCM/PVC plants have been exposed an unknown number of times to 24-hour average concentrations ' , of VCM of at least 1 ppm with occasional peak exposures of 30 ppm, however, over 90* of the observations have been less than 1 ppm. 6. Available monitoring data indicate that exposure to VCM around VCM/PVC plants is a local problem confined to within about an 8 km radius. Data in the vicinity of PVC product fabricating plants and other sources are not available. 7. Interim methodology is available for monitoring VCM in the atmosphere, but a standard monitoring system has not been developed. 8. Air inhalation is the primary route of human exposure to VCM. 9. VCM is a primary pollutant, but is atmospherically active and hence a precusor for other pollutants. Little is known about transforma tion, transport and removal processes. The half-life in sunlight is about 6 hours. 10. VCM in drinking water or food presently does not appear to be a problem. 11. There are no known natural sources of VCM. 12. The emissions data identifying specific point sources in PVC and VCM plants is based on calculationsand estimates and is not sufficiently accurate to serve as the basis for the formulation of a quantitative emissions control strategy. 13. The practicality and effectiveness of carbon sorption systems, surveilienee-maintenance programs, and deep stripping of the polymer UCC 011660 remain to be demonstrated as comnerclally visible control techniques. 14. There are no known studies of damage to vegetation In areas surrounding VCM/PVC plants. v ucc 011661 . ... 2. J INTRODUCTION r, V-. v. * 00 i:0; QuOit Oa CITE Historically, national and international commerce; has established markets for new products rarely with due consideration being given to the environmental consequences of the manufacture, use, and-disposal of the new products. Consequently, air, water, soil and biota have been contaminated with a wide variety of natural and snythetic chemical compounds that may threaten public health and welfare. The contributory role of a number of chemicals in the production of cancer and other chronic degenerative disease is well known. In the absence of appro priate pre-market testing, assessment of environmental health hazards * for many chemical compounds often depends upon retrospective analyses after these products have attained broad multi-media distribution. Establishing prudent standards of environmental quality depends upon availability of a broad integrated data base that is sufficiently quantitative to permit appropriate risk and benefit assessments to be made. Until recently, the principal environmental concerns associated with the plastic industry has been waste-water effluents from industrial facilities and the solid waste problems associated with accumulation and disposal of various plastic materials. UCC 011662 / DWFT 00 NOT QUOTE OR C!TE In 1971 the release of pbthalate plasticizers from flexible plastic material not only aroused public health concern but served to ' elicldate a mechanism of transporting potentially hazardous material In a wide-spread fashion. More recent attention has focused upon serious occupational health hazards associated with exposure to vinyl chloride. "Hie basis for this concern Is evidence of vinyl chloride carcinogenicity in experimental animals and man. The nredomlnate comnercial Importance of vinyl chloride lies in the manufacture of polyvinyl chloride resins which are subsequently manufactured into a large -"I number of useful plastic products. Vinyl chloride may be disseminated on a broad scale as an unreacted monomer entrapped in / finished products such as polyvinyl polymers ana cu-polymers similarj to that of the phthalate plasticizers. During the past thirty years, vinyl chloride production has Increased from less than 45 million kg In 1943 to more than 2.4 billion kg In 1973. Estimated loss from industrial facilities (both monomer and polymer production) have been placed at over 90 million kg In 1973. The primary purpose of this report is to provide an interpretive and where possible, quantitative summary of available biomedical effects of vinyl chloride. In this regard, attention is given to gaps In the existing data base. 1 UCC 011663 Emphasis , .has been placed upon recent health effects developments, efforts have been made to review and place into perspective the older literature as well. ucc 011664 / 3. CHEMICAL AND PHYSICAL PROPERTIES \j I I _ 3.1 Physical Properties Vinyl chloride (VC) Is a chlorooleflnlc hydrocarbon with a density of twice that of air having the structural formula shown below and a molecular weight of 52.5. HH Since VC bolls at -13.37C, It Is a gas at normal atmospheric tem perature and pressure. It melts at -160C, and therefore Is a solid only at very low temperatures. Vinyl chloride Is highly flammable having a flash point of -108F. The explosive limits are from 4 to22 percent VC In air by volume. The presence of a chlorine atom in the ethylene molecule changes the dipole moment from 0 to 1.45 debye units. The corresponding saturated hydrocarbon, cloroethane (ethylene chloride) has a dloole moment of 2.05. Slnce^yyl chloride can be manufactured starting with ethyle.ie or ethylene chloride, some of the physical 'K properties are changed from the parent compounds by the presence of chlorine and the double bond. These properties and the phenomenon of resonance reduce the reactivity of VCM. VCM Is soluble In organic solvents, but sparingly soluble In pure water. The quantity of the VCM that dissolves in water will depend on the partial pressure of the gas above the solution. VCM reacts minimally with pure 3- ' UCC 011665 DRAFT DO N'T QUOTE OR CITE water. If the partial pressure of the gas above the water Is reduced VCM will escape Into the gas phase. Therefore, water that contains VCM would release,the gas to the ambient,air or chemical reactions occur with water impurities which might tend to inhibit escape of vinyl chloride. Certain salts do have the ability to combine with VCM; soluble silver, and copper salts Increase the solubility of VCM In HgO by forming complexes, for example. besides the previously mentioned salts, olefins will also complex with FeClg. Pt Cl2, IrClg, 2 and a host of other sa^ts- Hence, the residence time availability of VCM In water could be affected by the presence of certain salts. The principal physical characteristics of vinyl chloride are given in Table 3.1. 2-6 3.2 CHEMICAL PROPERTIES The halogen atom attached to the carbon to carbon double bond is generally inert. When forced to react, HC1 is extracted from VC with the resulting formation of acetylene. Similarly, the hydrogen atom attached to double bonded carbon atoms are highly stable In substitution reactions. The order of reactivity of hydrogen atom is allyllc >3 >2 >1 >CH^ > vinylic. The Importance of vinyl chloride lies in Its ability to polymerize readily In the presence of ultraviolet light or peroxides. The product Is a highly useful plastic containing the basic structure (CH2 - CC! H)R. UCC 011666 / DO NOT QUOTE OS CITE The most important reactions of the olefinic hydrocarbons are related to additions of various compounds to the double bond, c.g., hydrogen peroxide, halogens, haloncids, halohydrins, oxides of nitrogen, sulfuric acid and ozone. Only a few, namely, hydrogen peroxide, Oxides of nitrogen, sulfuric acid, and of course ozone, should be of some importance in ambient air. The ease of formation of free radicals of importance in photochemical activity is allyl >5* >2 >1* > CHj > vinyl. However, the stability of the free radical Is In the reverse order. ucc 011667 Table 3.1. PHYSICAL CHARACTERISTICS OF VINYL CHLORIDE5 . Formula /Molecular weight Vapor pressure 21.1C Specific volume 21.1C Bolling point 1 atm Freezing point 1 atm Specific gravity, gas 15C., 1 atm (air 1) Density, liquid - 20C Critical temperature Critical pressure Critical density Latent heat of vaporization b.p Latent heat of fusion m.p Specific heat Liquid 20C Gas 25C., 1 atm., Cp Viscosity, liquid -2QC Flammable limits In air Autoignition temperature Dielectric constant 17.2C Surface tension -20C Refractive Index, n"^ Solubility In water 25C, 1 atm ' #' CHgCHCl 62.50 2 34 ps ig (2.4 kg/cm gauge) 6.2 cu ft/lb (387.0 ral/g) 7.0F (-13.9C) -255.5F (-159.7aC) 2.15 0.9834 317.1F (158.4C) 774.7 ps la (52.7 atm.) (54.4 kg/cnrabsolute) 0.370 g/ml 79.84 cal/g 18.14 cal/g 0.38 ca1/(g) (C) 0.205 cal/(g)(C) 0.278 centistoke (0.2734 centlpoise) 4.0-22.0 percent (by volume) 881.6F (472C) 6.26 22.27 dynes/cm 1.4046 0.11 g 100 g water VCM is soluble In alcohol, very soluble In ether and carbon tetrachloride. Synonyms: cloroetliene, chloroethylene Conversion factors at 25C and 760 mn Hg. 1 ppm * 2,56 mg/nr3 1 mg/liter * 391 ppm UCC 011668 REFERENCES Wi y j'j : L Ui 1. Braker, W. and A. L. Mossman. Matheson Gas Data Book, Fifth Edition. East Rutherford, N. J., Matheson Gas Products, 1971. p. 561. 2. Morrison, R. T. and R. N. Boyd. Organic Chemistry, Second Edition. Boston, Allyn and Bacon Inc., 1970. 3. Fleser, L. F. and M. Fleser. Organic Chemistry, Boston, D. C. Heath and Co., 1944. 4. Karrer, 0. Organic Chemistry, New York, Elseler Publishing Co., 1947. 5. Porter, C. W. and Stewart, Organic Chemistry. New York, Ginn and Co., 1943. 6. Wheland, G. W. Advanced Organic Chemistry, Chapman and Hall Ltd., 1948. ucc 011669 / DO NOT draft quo^orc,Te Table 4.1 possible interferences with vinyl chloride analysis .* < _ .. ucc 011670 / 4. MEASUREMENT TECHNIQUES 4*1. ENVIRONMENTAL AIR In selecting methods suitable for measuring VCM in ambient air, two factors must be considered. The method employed must be capable of measuring In the part per million to the part per billion range, and, because emissions are discontinuous, the method must be capable of responding to high concentration peaks as well as low level backgrounds. 4.1.1 Spectrophotometry To design or describe a useful measurement technique or analytical method for a particular purpose requires that three major criteria be satisfied: sensitivity, accuracy and specifity. In addition practicality and economics are Important considerations in the development of new analytical methods. As a general rule, it is most desirable to measure a pollutant or chemical specie directly in the matrix or phase--gas, liquid or solid--In which the material is generally encountered. This rule pre cludes any loss or transformation of the analyte to a non-detectable form. Whenever possible. In.the following descriptions of analytical techniques, the above criteria will be addressed. VCM absorbs infra red (IR) radiation In the gas phase. The absorption bands at 941 or 917 cm"^ have been commonly used to quantify VC. However, the method Is not entirely specific for VCM as interfering substances (Table 4.1) are encountered In ambient airJ Multiband measurement and data processing techniques are available to correct for these interferences, but additional instrumentation is required. The Fourier transformation system Is an excellent example of a refinement in this technique. The cost, however, of this type of system would.be prohibitive for routine / ucc 011671 maf i CO HO O'lcrt +* T i:; monitoring. Infrared analyzers are not sufficiently sensitive for trace quantities of VCM in air since effective optical paths of 20 meters are required to achieve a lower limit of detection of 1 ppm. Accuracies of 10 percent are attainable when properly calibrated with standard qas mixture. Although the technique is adaptable to continuous monitoring. It Is ImpractlcaT'as a multipoint detector0f the type generally required to characterize a problem area. Economics dictate this technique for use as a research tool or as a laboratory instrument. Air samples, either instantaneous or integrated, can be collected, concentrated if necessary, and returned to a central laboratory for analyses by IR. 4.1.2 Gas Chromatography Gas chromatography (GC) is an analytical technique that separates a complex mixture into its component parts by partitioning the chemical material between a gas and a liquid or solid. The technique is highly popular because of its versatility in solving analytical problems. A wide variety of materials and conditions are available that can be used to achieve separations effectively and inexpensively, even 2-15 *or closely related compounds. A list of column materials that have been used to separate vinyl chloride and related compounds is shown in Table 4.2. This by no means is a complete list and there are other systems that can be designed. It is difficult to select the best column material from the available literature, because quantitative data on column efficiencies and height equivalent to a theoretical plate are not generally UCC 011672 Table 4.2 COLUMN MATERIALS AND LIQUID SUBSTRATES SEPARATING VINYL CHLORIDE Column materials and liquid substrates Porapak, Q Silicone oil DC 550 Silver nitrate/ethylene glycol 30* silicone oil and polyethylene glycol Dlsodecyl phthalate/carbowax Carbowax 4000 25* 0-CgH4 (C02Bu)2 15 to 15* silicon rubber SE-30 Silicone grease Porapak, -S Poly (methyl phenyl slloxane) Trlcresyl phosphate 30* dloctyl sebacate Carbowax 1500 or carbopack A References Forrls (1960) .12 Levadle (1960) .18 Smith B. (1962) .17 Vyakhirev (1962) .2 Hannon (1963) .19 Newman (1963) .16 Martur (1966) .5 Hlnshaw (1966) .6 Esposito (1967) .7 Koenig (1967) Popova (1967) .10 .10 Vlasov (1970) .14 Zalinyan (1972) .15 Brown D. Region IV .23 Interim procedure t- ucc 011673 im/'ir i DO NOT QUOTE 03 CiTE provided, nor are the objectives of the reported method always similar to ours. Therefore, laboratory evaluation is required to ascertain the best column material that effectively separates VCM from all possible Interferences that may be encountered in ambient air. It is particularly Important that~VCH is separated from hydrocarbons and (01 Freons Alternatively, more specific detectors must be used in combination with GC. Detectors that are used in combination with GC columns are also varied. Highly selective and highly sensitive detectors are available which will detect quantities of material down to 10-12 grams. Completely automated GC are commercially available for environmental monitoring. On some of these Instruments all that needs to be changed are the column materials and operational parameters. However, with rare exceptions, measurements are not made continuously but are made by taking instan taneous samples at short periodic Intervals. 4.1.2.1 Detectdrs--The flame Ionization detector (FID) Is a general purpose detector which responds to most organic compounds, has a wide linear range of several orders of magnitude, and sensitivity down to parts per billion. The response to a chemical compound generally varies with the number of carbon atoms. However, certain carbon atoms have reduced or no response when the carbon atom Is attached to atoms other than hydrogeni e.g.. Cl, 0,S. The detector Is Insensitive to almost all organic gases and compounds. The minimum detectable concentration for VCM using a 10 ml sample of gas Is 0.01 ppm. When coupled to a GC column to achieve separation, the FID has been the detector of choice because of Its sensitivity and minimal cost for the analysis of complex 0 Trademark - E.T. duPont de Nemours & Co., Inc. 7 ucc 011674 r- . / L J v U'UJ(Uic or cue organic mixtures. The combination of QC-FID has been used under field conditions, but power requirements and the need for hydrogen gas reduce the practicality of the instruments for routine monitoring. " The thermal conductivity detection (TC) Is mentioned only for historical purposes. The detector-measures changes In heat capacity of the carrier gas, usually helium or hydrogen, when materials elute from the column. The sensitivity is low when compared to other available detectors. It Is not suitable for trace analysis. In addition, TC responds to water vapor; this causes problems In Identifying and measuring compounds of Interest. A third group of detectors fall under the general classification of D.C. Ion chambers. These Include argon Ionization, helium ionization, micro-cross section detectors and, most Important of all, electron capture detectors. The arqon detector consists of 2 or 3 parallel, electrodes and a radioactive source, usually Sr90 , which excites the argon carrier gas. When chemical compounds elute from the column they are ionized by the excited argon. Under a voltage gradient up to 1,000 V these ions produce an Increase In current flow across the plates or electrodes which Is proportional to the concentration of the eluting material. The sensitivity Is foody but it Is non-specific and temperamental. < The design of the helium detector Is similar to the argon detector, except that helium Is used as the carrier gas. Voltage gradients as high as 2,000 V can be applied across the plates. Radioactive hydrogen, tritium, is frequently used as the excitation source. This detector Is also temperamental, highly sensitive and non-specific, but is usually recom mended for traces of Inorganic gases to be detected with gas-solid ucc 011675 chromatography. pr'rr r'AFi r - .... />, i;y i- .'*! r ' ' T l.\.< - - The electron capture (EC) detector Is of similar design as the other DC-ion chambers. Nitrogen or argon is used as the carrier gas and tritium or N1 63 as the radioactive sources. Low voltages 5 to 25 volts are applied across the plates usually in a pulsating mode to eliminate polarization of the electrodes. The detector is specific and highly sensitive to halogenated materials and other materials that absorb electrons. It has a smaller dynamic range and is more temperamental than the FID. Sensitivities for VCM have been reported to be less than that with the FID because of the presence of,a single chlorine atom in the molecule. 4,24 More recent data indicates sensitivities tabulated24 In Table 4.3. ? Table 4.3 SENSITIVITY OF SELECTED DETECTOR USED IN GAS CHROMOTOGRAPHY TC Arqon D Vinyl chloride 2 x 10`6 g 1.9 x 10`9g Trichloroethylene 2.2 x 10"6g 1.0 x 10`8g FID 2.2 x 10-9 g 8.5 x 10-9 g EC 2.3 x 10'9 g 2.0 x 10_11g The GC-EC has the advantage of requiring only one gas cylinder of nitrogen, and, because of Its specificity, complete resolution of VCM by the GC column is no longer mandatory. Battery operated GC-EC instruments have been manufactured commercially. The micro coulometer Is a highly sensitive and electrochemical detector of the chloride Ion. The specificity of this detector Is increased when used with gas chromatography. Chlorinated hydrocarbons, such as VCM are pyrolyzed as they elute from the column to form gaseous HCI which reacts -7 ucc 011676 / nn DRAFT 00 N0T quote OR cite regenerates Ag until the electrical balance is restored. The detector will also respond to any substance which precipitates Ag. However, depending on column and pyrolysis conditions, these potential interferences can be eliminated. With electrochemical efficiency of close to 100 percent, the coulombs'generated to restore the balance is proportional to the quantity of Cl' in accordance with Faraday's law. The detector is highly accurate because the coulomb is a primary standard, and hence standard reference materials are not absolutely essential. The sensitivity of the detector for VCM is of the order of a few nanograms. Power requirements make this system impractical for field instrument use, but It is excellent in the laboratory technique. Another electrochemical detector is the conductivity device 28,29 developed by Coulson for use with gas chromatography. The conductivity detector measures water soluble ions or gases that produce soluble ions when they react with water. The effluent material is either oxidized or reduced in a small furnace prior to reaching the detector. Depending on the mode of operation, the detector response can be restricted to HC1, SO2 or SO3. High sensitivity is attainable because of the solubility of these gases in water and the high mobility of the hydrogen Ion produced. Sensitivity of the order of a few nanograms is possible. The ultimate sensitivity depends on the geometry or the cell constant. More recently the conductivity cell has been designed by Hall to yield higher sensitivities 30 than the Coulson detector. Again, specific detectors reduce the demand on the column to resolve compounds with elution times close to VCM. Power requirements reduce the practicality of this detector under field / conditions. nrrr D3 n:; q-ot: c:< :;;e The Bellsteln test Is a classical flame test for detecting halogens in the presence of copper. This test Is the principle for a flame photo- netrlc detector that has Keen use*! "5 a 0*5 chromatoqraDhic detector. It measures the characteristic spectrum..produced by halogenated substances with a photo- multipier tube. The sensitivity of this detector has been enhanced 31 by use of iridium metal. It may be useful as a continuous monitor for gaseous halogenated substances without gas chromatography. By use of a filter to remove Inorganic halogens, this measuring technique would give an Index of the total quantity of halogenated materials in a given area. However, to achieve specificity for VCM a GC column would be required. Practicality for field use is equivalent to other flame detectors. Chemiluminescence detectors are used in continuous monitors \ that measure the quantity and type of light that is produced by reacting certain compounds with ozone - the determination of ozone by reacting with ethylene or the determination of NO by reacting with ozone Recently the monitor has been adopted by EPA scientists to measure vcm. / f7 However, to obtain specificity, a gas chronatographlc column is required. Current evaluation of the monitor Indicates a sensitivity of a few parts per billion Is achievable. The alkali flame Ionization detector and stacked thermionic detectors have also been used as GC detectors to measure halogenated compounds. The mass spec trometry when connected to GC column is particularly useful In Identify! g an unknown compound and for unequivocal confirmation of VCM. All of these detectors have sensitivities within one or two orders of magnitude UCC 011678 DRAFT DO fJOl QUOTE O.T Cl EE of each other. The necessity of one or more gas cylinders and power requirements limit their utility in the field instrument. Some techniques are more selective than others, some are too expen sive for field application and some require more extensive evaluation for the purpose of measuring YCM. 4.1.3 Other Methods of Analysis Coulometry has been used to measure olefinic hydrocarbon by reaction with electrogenerated Brg. This technique is not useful for measuring VCM in ambient air because of the long reaction time required for the bromination of olefins. In addition, reducing substances such as S0 would interfere by consuming bromine. Oxidant would cause a negative 22,23 interference. Wet chemical methods have also been developed based on the bromination of VCM*. then titrating excess bromine. Tfe sensitivity is only 0.1 mq. Olefins, aromatic compounds that readily add ^o-iino and and reducinq aqents interfere with this wet chemical method. Vinyl chloride in air has been analyzed colorimetrically by 29 collection on activated carbon. The VCM was extracted and oxidized to formaldehyde. The formaldehyde was determined in the usual manner by reacting with chromotropic acid., however, ethylene and methanol Interfere. Sensitivity is only a few micrograms. PQ 2^ Polaroqraphy * has been used to measure VCM by bromination at the dropping mercury electrode. When this procedure was applied to volatile VCM from plastics, it gave higher result than the analysis of total chloride. Hence interfering volatile materials are present. Sensitivity for VCM was olv 70 ug/ml. UCC 011679 / 4.1.4 Sampling and laboratory Analyses DRAFT DO NOT QUOTE OR CITE The most Inexpensive approach to monitoring VCM would be to collect samples In a suitable manner and return them to a central laboratory for analysis. Using this approach, samples could be collected through out a suspected problem area with a minimum of power, a minimum of equipment, and with unskilled personnel. Grab samples are collected, as described In the Interim procedure 23 In Tedlar bags or stainless steel calisters. Varying degrees of instability from 0 to 10 percent per day have been reported when VCM In air was stored in Tedlar bags. It is possible leaky bags are responsible for losses. However, VCM in pure air appears to be stable. In polluted air, particularly in the presence of ozone, reactions are expected to continue. Direct photo excitation of VCM are not expected to occur because solar radiation below 290 nm does not reach the lower atmosphere. Hence, this solar energy Is not absorbed by VCM In ambient air. However, In the presence of nitrogen dioxide which absorbs solar radiation about 2900 nm, secondary reactions Involving ozone (produced by the photolysis of N02) and VCM occur. It may be possible to spike the air sample with a free radical or ozone scavenger to stabilize the VCM In the sample. Tedlar bags used for sampling create a storage and handling problem. Wall losses and permeability of the VCM through the walls of the plastic bag do not appear to be a problem with Tedlar at concentrations in the range of 10 ppm. ucc 011680 / Evacuated stainless steel canisters have the advantages of being more rugged, and more easily stored and transported than Tedlar bags. These canisters need only a silicone septum through which a needle can be inserted to evacuate the system to a low pressure. The needle is"withdrawn and the septum seals itself maintaining a vacuum until a sample is ready to be taken. At the sampling site, a needle is again inserted and polluted air allowed to fill the canister. The needle is withdrawn and the septum seals itself again. At the laboratory, an aliquot of the sample is removed with a gas tight syringe and injected directly into a gas chromatograph or other measuring device. The above procedure yields short term concentration and does not yield a total dosage It appears necessary - particularly because of the discontinuous nature of the emissions that produce pockets of hiqh concentration of VCM-- that some accurate measure of the total or average dosage over a prescribed period be obtained. 4.1.5 Liquid Scrubbers Very little information is available concerning the use of liquid scrubbers for the collection of VCM. The physical properties of VCM are such that it is not easily trapped by liquid unless some complexation reactions can be produced. Certain salts have been reported to complex VCM, but these salts have not been thoroughly investigated for this purpose. In addition, liquid scrubbers for monitoring air pollutants, introduce collection, handling and stability problems that render the technique impractical. UCC 011681 4.1.6 Solid Scrubbers Solid scrubbers arc more easily handled. transported and have fewer collection problems. Activated charcoal has been extrcmely^uscful for the collection of gases and vapors including VCM. The capacity of charcoal for VCMis limited. Hence, problems have been reported resulting from the use of small tubes and large sampling volumes. It is imperative that all newly purchased charcoal be reactivated under nitrogen to maintain its absorption capacity and to remove impurties tnac may interfere in the analyses. Charcoal was selected as the collection medium in the interim procedure in order to to obtain time weighted averages. The use of multiple sections was specified to ascertain the quantity of charcoal required under field conditions. It Is not yet known how the procedure will respond under field conditions and relative humidities close to 100 percent to determine the quantity of charcoal required to collect VCM under the most adverse conditions. Other solid scrubbers may be more suitable for collection of VCM. 3 Hollis reported long retention times of low molecular weight hydrocarbons and halogcnatcd hydrocarbons on porous polyaromatic V3C2. polymer beads. Williams and Urnstend determined a number of haloqenated hydrocarbons by concentrating the sample on Parapak Q & S. ucc 011682 / po*rr DO N"T TMl,ui 0R f,'TE The materials were thermally desorbed at 100C fr analysis. They used the micro coulomctcr with the silver cell to determine VCM at the 10 parts per billion level. 25 Lonneman used carbowax under erogenic conditions to concentrate the sample and analyze concentrations of 100 parts per trillion by gas chromatography. More recently, Bella^successfully concentrated VCM froin aqueous solution by adsorbing on carbonsicvc B. Quantitative recoveries were obtained from aqueous solution containing from 5 ng to 5 |ig of VCM. All solid scrubbers should^be evaluated under sim ulated field conditions. Permeation devices are available commerically which will generate low levels of VCM in air and the resulting mixture diluted with humid air. In this manner, collection and ... ' ` y rfipionrins can be more definitively established. The stability of VCM on storage 1n tne presence of reactive pollutants in the atmosphere Is not known. Some Investigators have reported that VC might be polymerizing- on these scrubbers. It has been 27 demonstrated by Lajos and Paduly that hydroqulnone improved recoveries of VCM from charcoal without reducing Its adsorption capacity. 4.1.7 Sample Preparation Grab samples present no problems :since aliquots are injected directly into a gas chromatograph, if the range of interest is greater than 0.02 ppm. Air samples can be concentrated as previously described, to detect levels of 0.2 ppb* if a sufficient sample is avail^le. ^ood recoveries from charcoal hive been reported by Brown by extracting with CS^. This is an UCC 011683 / to m\. i)uuk i-* cirr. excellant solvent for gas chromatography when using the FID This detector gives no response to CS under the usual operating condition and solvent interferences are eliminated. KeenmanJ however, observed that appreciable quantities of VCM evaporated Into the head space above the liquid when CS2 was used as the extractant for VCM. Total recovery of VCM in both the liquid and the gas phase was only 80X. When VCM was extracted with tetrahydrofuran (THF), he obtained a recovery of 88 percent with less diffusing into the head space than was evident with CS^, 4.1.8 Automated Monitoring Completely automated monitoring instruments, which arc commercially available, can be easily modified to measure vinyl chloride. For example, the carbon monoxide - methane analyzer, which uses a precoiumn, a ^as chromatographic column, and flame ionization detector may be used as a vinyl chloride instrument by simply changing the column packing material and operational parameters. The precolumn removes most of the hioher molecular hydrocarbons and maintains the inteqrity of the main column. Using these types of instruments 5 to 10 samples can bo taken per hour during a 24-hour day. Portable gas chromatographs that arc less expensive than those described ahove ar* commercially available for monitnrinn VCM, hut an attendant. Both FID and PCD are available with these instruments with * a reported sensitivity of 0.1 ppm VCM. The interim procedure has been very useful in obtaining pre liminary data and defining the magnitude of the problem, however. UCC 011684 well defined studies should be undertaken to eliminate sources of errors and refine the procedures prior to standardization. uce 011685 1 4.2 REFERENCES ,,,,.. DO NOT QUOTE OB CITE ! Keenan, R. R. Private Communication. G. 0. Clayton Assoc. Southfield, Mich.1*174. 2. Vyakhirev, D.A. Z. S. Smolyan, L. E. Reshetnikova, N. D. Demina, M. I. Vlasova, and A. A. Karnishin. Analysis of Vinyl Chloride by Gas-Liquid Chromatography`s--_Tr, Pa. Khim, i Khim. Tekhnol. 4_: 490-497, 1962. 3. Hollis, O.L and W. V. Hayes. Gas-Liquid Chromatographic Analysis of Chlorinated Hydrocarbons with Capillary Columns and Ionization Detectors. Anal. Chem. 34:1223-1226, 1962. 4. Clemons, C.A. and A. P. Altshuller.Responses of Electron Capture Detector to Halogenated Substances Ahal. Chem. 38_ (1): 133-136, 1966. 5. Martur, V.G. $. A. Antipova, and V. S. Kozlova. Analysis of Mixtures of Fluoro and Chloro Derivatives of Elhane and Ethylene on the KhL-3 Laboratory Chromatography. Ukr. Khim. Zh. 32(4):391-392, 1966. 6. Hlndshaw, L.D. Gas-Chromatographic Determination of Chlorinated Hydrocarbons In 1,2-dichloroethane. J. Gas. Chromatog. 4(8): 300-302, 1966. 7. Esposito, G.G. and M. H. Swann. Identification of Aerosol Propellants in Paint Products by Gas Chromatography. J. Paint Technol. 39(509):338-340, 1967. 8. Koenig, H. Separation, Detection, and Quantitative Determination of Aerosol Propellants by Gas Chromatography. Fresenius Z. Anal. Chem. 232.(6): 427-432, 1967. 9. Balandina, L.A. and A. I. Subbotln. Chromatographic Analysis of Products of the High-temperature Chlorination of Ethylene-. Zavod. Lab. 34(2): 151.1963 10. Popova, T. P., Kevyagina, K.I. Kevyagina and M.A. Mamedov. Gas-chroma tographic Analysis of a Vinyl Chloride Mixture: Aserb. Khim. Zh. No. 5, 116-120, 1967 ucc 011686 / DRAFT DO NOT (,'OOii: Cl? CITE 11. Maltese, P,, A. Mori, and S. Panizzi. Gas-chromatograph1c Determination of Vinyl Chloride In Hydrochloric Acid. Chlm. Ind. (Milan) 50(6):667-668, 1968. 12. Foris, A., J.G. Lehman. Gas Chromatographic Separation of Halocarbons on Porapak Q Porous Polymer Beads. Separ. Scl. (3): 225-241, 1960. 13. Karabanov, N.T., L.V. Isalcheva. Chromatographic Analysis of Vinyl Chloride. Gasov. Khromategr. No. 12, 82-87, 1970. 14. Vlasov, S.M., G.N. Bodyagin. Gas Chromatographic Analysis of Trichloroethylene. Tr. Khim. Khim. Tekhnol. 1:161-162, 1970. 15. Zallnyan, V.P., N.B. Znamenskaya. Chromatographic Analysis of v Gas Mixtures In Vinyl Chloride Production. Khim. Prom. Tsvet. Metal. No. 45, 24-30, 1971. 16. Newman, M.S. et al. J. Org. Chem. 28:1851, 1963. 17. Smith, B. Acta Chem. Scand. 1'6:351 , 1962. 18. Levadle, B. Amer. Ind. Hyg. Ass. J. 21:20, 1960. 19. Hannon, C.I. et al. J. Gas Chromatog. 1:27, 1963. 20. Ryabov, A.V., and G.D. Panova. Application of the Polarographic Method In Analysis of Unsaturated Organic Compounds. Doklady Akad. Ilauk.(S.S.S.R.), 99:547-549, 1954. 21. Meshkova, O.V., V.M. Dmitrieva, V.D. Bezuglyi. Polarographic Analysis of Waste Waters from Poly-(v1nyl chloride) Production. Khim. Prom. (Moscow). 47(4): 271-273, 1971. 22. Tsendrovskaya, V.A., K.I. Stankevich, I.S. Reislg. Selection of a Method for Determining Volatile Substances Separated from Some Plastics. Prlmen. Polim. Mater. Izdelli Nikh. No. 1, 418-425, 1969. TJCC 011687 / DRAFT CO NOT C'JOIt cn CITE 23. Brown, D. EAP Region IV, Athens, Ga., 1974. Personal Communication with QAEML, NERC, RTP, M.C. 24. Boettner, E.A. and F.C. Dallos. Capture Detection of Chlorine and Lead Substituted Compounds. J. Gas Chromatog. 3^: 190, 1965. 25. Lonneman, W.A. Measurements of Vinyl Chloride from Aerosol Sprays. EPA-NERC, Research Triangle Park, N.C., Unpublished, Apr., 1974. 26. Bellar, T. National Institute of Occupational Health, Cincinnati, Ohio. Personal Communication with B.W. Gay, CPL, NERC, Research Triangle Park, II.C. 37. Lajos and Raduly - Chemical Abstracts. 76:366901, 1972. 28. Coulson, D.M. Colormetrlc Determination of Vinyl Chloride in Air. J. Gas Chromatog. 4:285, 1966. 29. Gronsberg, E.S. Khim. Prom 7^:30-31, 1966. 30. Hall, R.C. A Highly Sensitive and Selective Mlcroelectrolytic Conductivity Detector for Gas Chromatography. J. Gas Chromatog. 12(3) 1974. 31. Bowman, M.C. and M.J. Beroza. J. Gas Chromatog. 9(44), 1971. 32. Williams, F.W. and M.E. Umstead. Determination of Trace Contaminants in Air by Concentration on Porous Polymer Beada. Anal. Chem. 40:2232, 1968. 33. O'Keeffe, A.E. and G.C. Ortman. Primary Standards for Trace Gas Analysis. Anal. Chem. 38(6):760-763, 1966. 1 ucc 011688 1 / 5.1 SOURCES 5. ENVIRONMENTAL APPRAISAL Current mpnomer processes are of four types: 1. acetylene plus 'hydrogen chloride; 2. direct chlorination of ethylene and dehydrochlorination; 3. balanced direct and oxychlorination of ethylene and dehydrochlori nation; 4. oxychloriantion using oxygen Current polymer processes are categorized as: suspension, emulsion, bulk, and solution. Thus eight basic processes are discussed. This review is limited to existing commercial processes in the United States. There are two general methods for the production of vinyl chloride monomer. These are the acetylene hydrogen chloride reaction: lie; CH + lie t ii2c = CIIC1 an| t lie* thermal tk'hyiirochlui iunt ion of 1 .S-dicUloroethnno: ciai, - cn,/:i --> ii2c t;uci * nci Vinyl chloride monomer (VCM) plants are integrated with an ethylene dichloride production unit in the second procedure. The overall processes differ primarily in the manner in which the ethylene dichloride is produced. >. -i UCC 011689 Nine producers operate a balanced plant in which ethylene is chlorinated by a mixture of hydrogen chloride (HC1) and air to produce ethylene dichloride. Part of the IICI used for this process is in the form of recycled products from the thermal dehydrochlorination of ethylene / dichloride as shown above. Three producers use an integrated process in which the ethylene dichloride is produced by the direct chlorination of ethylene. Hydrogen chloride is recovered from the dehydrochlorination step, but is not re cycled into the process. One producer use the balanced oxychlorination process with the exception that oxygen is used for the oxychlorination reaction sequence. Two companies use acetylene as the starting material. Polyvinyl chloride (PVC) is produced at thirty-seven sites at a total yearly rate of approximately 2.4 billion kg. There are four processes used to manufacture PVC: 1. suspension polymerization (78 percent of total production); 2. emulsion polymerization (12 percent of total, production); 3. bulk polymerization (6 percent of total production); and 4. solution (4 percent of total production). Emissions of gaseous vinyl chloride monomer (VCM) are known to occur at both VCM and PVC resin plants. This VCM is distributed into the atmosphere surrounding the emissions source in patterns that depend on the amount of VCM released, the nature of the plant area from which it is released, and meteorological conditions. VCM air concentrations which may occur as a result of such releases are of interest. UCC 011690 DRAFT DO MOT Q::..Ut OiT Cl'f Data accumulated for this study show that annual production capacities are 2.42 billion kg of VCM and 2.15 billion kg of PVC resin (Table 5.1). Manufacturers operated at full capacity in 1974. On the basis of the analysis of the VCM emission data so far supplied to EPA by VCM and PVC producers, total VCM escaping to the atmosphere is on the order of 95 million kg per year. However, approximately 90 percent of the total VCM emitted comes from PVC polymer production facilities. This is shown in Table 5.1. Table 5.1. U.S. VINYL CHLORIDE MONOMER AND POLYMER PRODUCTION AND EMISSIONS (1973) Plant type VCM PVC Production Kq X 106/yr 2432 2159 VCM Emitted Kq X 106/yr 6-7 65-86 VCM Emitted Percent of production 0.2 - 0.4 3-4 It is also Important to note that while monomer plants emit less VCM per fcq of product than polymer plants, this may partially be offset by the tendency for monomer plants to have larger pro duction capacities than polymer plants. The net result Is that the absolute VCM emissions levels from polymer plants are usually in the range of 2 to 5 times those of monomer plants. i / "7 ucc 011691 Two additional features of the industry are significant in terms of potential VCM concentration levels in the atmosphere near plants. VCM plants are clustered primarily in areas along the Texas and Louisiana Gulf coast* and pvc plants tend to be located close to/or even adjacent to the VCM production site. This "clustering" of plants is greatest on the Gulf coast in the Pasadena-Dee*r Park, Texas region and in the Baton Rouge, Louis iana area. VCM monomer producing companies are listed in Table 5.2.1.Included in this table are the companies and their geographical locations, population figures for adjacent communities and calculated VCM emissions / levels. PVC polymer producers are similarly listed in Table 5 2.2.Table 5.2.3 shows the location of geographical clusters of VCM and PVC plants. -* /- ucc 011692 5.Z/ OVERVIEW OF PROCESSES The following tabulation of producers of vinyl chloride monomer Indicates published production capacity and vinyl chlotide emissions by process and location. (Table 5.2.1 through 5.2.5) v . . . . . . . . . . . .kV ,,r, Table 5.2.1 *: >nomi:r pi,ant i data * o * py DO iwf QUOTE OR c 1TE Or;;* viv Allied Chcnical American Chco. Continental Oil Dow Chemical * Ethyl Corp. M B.F. Goodrich Konothem, tnc. Cl ty ?..v hJ n;i 1 .11 1 ,.! ` --T* *"............. I'.iluu Rongi** La. 165,963 c Product ion r.. i. itv Kn 1 ss i nJ .7 kfixlO /yr J. kgxlQ6/yr I1 i 136 0.4 Type* Ft"'. , - b d; Long Beach. Ca. 358,633 " 77 0.2 B Charier., |,.i Freeport, Tex. 77,998 11,99 7 1 Plaqucnine, [,a. Oyster Cruel., Tc; . 7,739 c f Baton Rouge, La. Pasadena, Tex. Calvert City, Ky, 165,963 c 89.277 *' 31,627 J 273 82 155 364 123 68 455 0.8 i B 0.2 DC 0.5 DC 1.1 B 0.4 B 0.2 DC 1 1.4 B Celunar, l.a. 7.739 136 0.4 Ak P.P.G. Industries l..ikc Charles, La. H Cuayanllla, P.K. Shell Chemical 1* Peer Park, Tex. Narco, La. Tcnncco Chen. rasadona, Tux 77.998 -- 12,773 h -- 89,277 h 136 261 398 318 114 0.4 0.8 1.2 0.9 0.4 B - B B A T0TAJ.S ' 1,096,984 , 1 3096 9.3 \ (a) 1970 Census data <b) Extrapolate.] fijyaies Base.! oa cstlr./<L>.d atr.ispherlc c.-tission loss of 0.3 per cent of VCM produced it. E-jiutiT pi. r.cs <e) Baron Rouge Parrish (County) - 302,331 (nCl (d) Balanced (!') - combination of direct ch lor i tint iot/ and oxvclilorlnation process in which the hyt'ree.-n chloride produced in cracking is recycled to the caychlorination process. <e) Los Anj;c*lfS t-.unty - 7,032,075 * (O Brazoria county ~ 10^,312 (c) IMaqiur-iru. S'irris'-i (Goti.uy) - 23,225 (hi if.irrts County - l,?.!],912 (i) Diicct Lhloi ::e.ition (in) (O Pt'j'iilAMofi k < t lAj is for ` Ky. r -j. t ucc 011693 Table 5.2.2.PVC POLYMER PLAKT VCM EMISSIONS DATA. 00 Qm or CITE c c-h c ! Plastics Division Air Products 6 Chem., Inc. American Chem. Corp. (Joint Venture-Altlantic Rich field Co. 5 Stauffer Chem. Co.) Borden Chem. division Borden, Inc. Conoco Plastics Division Continental Oil Co. Diamond Shamrock Chemica^ Co. (Subsidiary Plastics Divi) Diamond Shamrock Corp. ( (Industrial Chemical Div.) Ethyl Corp. Chem./Plastics Division The Firestone Tire 5 Rubber Co. Chemical/Plastics Division The General Tire & Rubber Co. B\F. Goodrick Chemical Co. The B.F; Goodrich Co. i- ' Location Calvert City, Ky. Pensacola, Fla. Long Beach, Ca. IlliopoLis, III. Lcc;ninster, Mass. Aberdeen, Miss. Oklahoma City, Okla. Delaware City, Dela. Deer Park, Tex. Baton Rouge, La. Perryvllle, Md. Pottstown, Pa. Ash tabula, Ohio Long Reach, Ca. llenty. 111. Louisville, Ky. Avon Lake , Chio PeJric.-\tov::i, .v.J. CiLv ropulation a 31,627 cl 59.507 358,633 E 1.122 32,933 6,157 366,481 b 2 IP4 12,773 - 165,963 1 2,091 25,355 24,313 358,633 2,6i0 3 361,472 12,261 .ypc or Suspension Suspension VCM PVC capacity emissions kg x 106/vr s. 2.2 23 0.9 57 2.3 Suspension 6 Emulsion Suspension 6 Emulsion Suspension 6 Emulsion f 129r 100 36 113f 5.2f 4.0 1.5 4.5f Suspension & Emulsion * Suspension, Emulsion & Solution 32 59 64 15 - Suspension, Emulsion, Bulk 2v & Solution 19 o-77 37 125 37 19 o 3.3 CD CD 7.9 2-5 >CD CD 6-8 CD --1 m --n --\ ^ 2.3 _ 2.3 ~ l 5.0 rr 1 2.3 2.4 011695 DRAFT T?ble 5.2.2 (Continued) -------------1JV. nut ycu-M-c- >m Irl 1 L---------------------------------- r-ir">;inv Location PCTVCJ ,:ityt .1 on a Type o[ n roc'-'-s h'- iical Division The Goodvear Tire 4 Rubber Co. Great American Chemical Corp. Plaqueinlnc, La. Kiagra Falls, N.Y. Fitchburg, Mass. 7,739 k 85,615 43,343 Suspension, Emu Is ion 6 Dull: 35 Sun.jnsjK i oil Keysor-Century Corp. Saugus, Ca. ----- e Sus.pen:;: on Monsanto Polymers 6 PetroChemicals Company Monsanto Company National Starch F, Chemical Corp. Hooker Chemical Corp. (Subsidiary Ruco Div.) Occidental Petroleum^Corp. Thompson Plastics Co. Div. 01in Corp. Pantasoto Co. Springfield, Mass. Mcrcdosia, 111. Burlington, N.J. lllcktsviJle, N.Y. Assonot, Hass, Passate, N.J. Point Pleasant, W.Va. 163,905 1,178 11,991 1 48,075 -- 55,124 6,122 Suspension 6 hi.mluirin Emulsion Suspension & Bulk 70 Suspension Emulsion Robintech, Inc. Plastics Division Stauffer Chemical Co. Tenneco Plastics Division Tcnneco Chemicals, Inc. Painsvilie, Ohio Delaware City, Dela. ' Burlington, N.J. Fleminp.ton, N..T. Pasadena, Texas 16,536 2,024 11,991 1 T.917 89,277 Suspension Suspor.s ion Suspension & Emulsion Chemicals 6 Plastics Div. Union Carbide Corp. Texas City, Tex. So. Charleston, W.Va. 38,903 16,333 Snspension 6 Solution 50 V'CM PVC C'oacity e..'.u;y:ras ke X 10^/vr ke X 106/ 45 1.8 45 1.8 18 0.7 16 0.6 68 2.7 5 0.2 82 3.3 5 0.2 68 2.7 12f -- cS 2.2f 113 & 4.5 73 <3 2.9 E q75 rr 3.o 27 0 i.i 136 'c' 5.4 f7*i 54 3.6 2.2 i1 1 ucc 011696 I'abie s. i.z continued FVfUjKJLirS f Total for two plants ^Oklahoma County - 526,805 ^ilarris County - 1,741,912 V.aton ltou^c Parrish (County) - 302,031 ^Uonry County - 53,217 k Plaquemines Parrish (County) - 25,225 *Burlinf;ton County - 323,132 \ i Connany Uniroyal Chemicals, Inc. Uniroyal, Inc. u: inn c.O". structios Cortclntead Ccrp. Georgia Pacific Shintucn ki Table 5.2.2 continued Location Painsvilie, Ohio City aPopulation 16,536 DMFT Type of b?*re' cc.-.s &Suspension f.r ulsiou C!> CITE vr;: ?VC Capacity e.i-tlonn c kg X 106/yr kg X 106/yr \ 14 2.5 Sub total 3,156 86.3 ,n' s Lake Charles, La. Plaquemine, La. Oyster Creek, Tax. 77,976 7,739 11,997 (i:nV:r.c.:n) " If Sub total TOTAL 90 90 / 110 // 290 / 2,446 4 4 5 13 99 DRAFT rr DO NOT QU01EOft CITE ucc 011697 Footnotes a1970 Census Data _ Office Air Quality Programs' computer file. k'l'lic statement on type of process is a preliminary one. Numbers in parenthesis indicate estimated production by that process in millions of pounds per year. ci\:-;t cupola ted figures in millions of kg per year (industry total 100 million kg/yrj based on estimated emission of 4.0 percent VCM during polymer production and recovery. ^Population given is for Paducah, Ky. fiLoa Angeles County - 7,032,075 & NOT Sf^T Table 5.?.3 CLUSTERS 01- VINYL CfLORIOO EMISSIONS ___<-or,,p. I.v Locat I (Ml \1 li oil CIk:.. ical s low Ha Lon Rouge, La. lMaquomine, la. '.thyl Corp. Baton Rouge, La. I thyl Corp. (Industrial Chora. Jiv.) Eaton Rouge, La. Georgia Pacific Plaqueraine, I.a. (under construction) I'lie Goodyear Tire 5* Rubber Co. (Gluiiiii a I Div.) Plaqucmine, La. lonoobt in, 1 no . Gcisntnr, La. C,ity . a _pojnilat ion n>ac i tv _ ... .m.issi.ous ,, kg X It/'/yyrf. kg X l()(,/yr Type _p.ro* ;l," 105.963 ,_7,739 165.963 165,963 136 0.4 154 O.S 122 0.4 82 3.3 IS d DC B S us pens i'i. f 7,739 7,739 91 45 3.6 1.8 Unknown Suspens i " 7,739 130 0.4 A. k Area omissions Continental Oil Lake Charles, La. '.P.G. Industries Lake diaries. La. Shell Chemical Narco, La. Certaintccd Corn, Lake Charles, La. (under cons true Linn) (rea emissions 77,998 77,998 77,998 10.4 272 0.8 136 0.4 38 0.9 91 3.6 5.7 B B B (unknown) diamond Shamrock dorp.j Diamond Shamrock C'aem. Co. (Subsidiary 1 ast ies Di v. ) .`thyl Corp. Door Park, Tex. Pasadena, Tex. 12,773 8 113 9.5 Suspeiis Lea & Emulsion 89,277 68 0.2 DC 5-- UCC 011698 Company / Table 5.2.3 (CONTINUED) Location City r_p_oIp__u_la_ tion. * Capacity X ll/'/yr CITE . ~U I.M1 SliiUUS -- !'> pi kg X I()/yr procos Shell Chemical Tviiucco Clieni. Onion Carbide Corp., ChemicaLs & Plastics Div. Area omissions Deer Park, Tex. Pasadena, Tex. Texas City, Tex. 12,773 8 "89,277 8 38,908 * 397 113 91 1.2 0.4 3.6 9.9 is A J" SllSpel. Dow Chemical Dow Shintech Freeport, Tex. Oyster Creek, Tex. Oyster Creek, Tex. 11,997 6 11,997 c 11,997 82 363 113 0.2 DC 1.1 B 4.5 Unknir, Area emissions ---- b .y (a) 1970 Census data (b) Extrapolated figures based on estimated atmospheric emission loss of 0.3 per cenL of VCM produced in monomer plants Extrapolated figures in millions of kg per year (industry total 100 million kg/yr Yr-i) based on estimated emission of 4.0 percent VCM during polymer production and recovery. (c) Baton Rouge Parrish (County) - 302,031 (d) Balanced (B) - combination of direct chlorinatJon and oxyclilorination process in which the hydrogen chloride produced in cracking is recycled to the oxychlorinati. . process. (e) Brar.oriu County - 108,312 (Q Plaquem ine Parrish (County) - 25,225 (g) Harris County - 1,741,912 (1>) Direct l i: I or inat i.'U (DC) (i) Acetyl, ne (A) __ ... ucc 011699 t / REFERENCES DRAFT BO NOT Quart 00 CITE 1. Bureau of Census data, Monitoring and Analysis Division, OAQPS computer files, 1970. /\ 2. Carpenter, B.ll. Vinyl Chloride^ An Assessment of Emissions, Control Tcdinitpjos and Cost.Research Triangle Institute Report for CSL, NCRC, RTl\ July, 1974. 3. Personal Communications between Industry representatives responding to OAQPS Section 114 letters to liPA personnel, May 1974 . tt i: UCC 011700 / 5.3 CONCENTRATIONS DR'.FT DO NOT .' U iU' ! '>' " CiTF. A paucity of data exists concerning the concentration of vinyl chloride in ambient air. In view of the potential health hazard associated with VCM, a preliminary field study was initiated to obtain more extensive and reliableda.tain the area of Industrial emission sources. The task of obtaining these data for air and water was assigned to the EPA Regional Offices. Interim procedures were established by EPA to insure comparability of the data. The initial data from these surveys will be reviewed in this section. Generally, it would appear that the Regions had varying degrees of resources and expertise in the area of air monitoring. In addition, the Interim procedure was not followed religiously in some cases, making comparisons of data between regions difficult. Levels for residential areas are usually expressed in parts per million (ppm) VCM, the concentration of VCM occurring in residential areas not not known with certainty at the present time but appear to be below 1 ppm - 90 percent of the time based upon the limited data presently available. 5.3.1 Air Most of the available data are from Instantaneous samples. Because of the discontinuous nature of the chemical process and emissions, the values were expected to, and in fact did, range widely. Values were as high as 33 and 3.4 ppm at distances of 0.3 to 3 miles respectively from emission sources. 5.3.1.1 Plant I 5.3.1.1.1 Grab samples--Summary data from the samples are tabulated in Table 3.3.1 The distance from the center of the plant to the sites is shown in the second column. Samples taken at site q 5- - I ucc 011701 Siit.p A B C D E F G H I J K L M N 0 P T U V M X Y Z Table/5.3,.1 CONCENTRATION OF VCM IN GRAB SAMPLES TAKEN AT PLANT Pistanrp km 0.2 0.3 0.1 0.2 ' 0.2 0.3 0.1 0.2 0.4 0.6 0.4 0.6 O.S 0.8 0. S 0.8 0.7 1.1 1.0 1.6 1.2 1.9 3.0 9.8 0.6 1.0 0.6 1.0 U. 7 1.1 0.5 0.8 0.1 0.2 00 00 0.1 0.2 0.2 0.3 00 0.2 0.3 Plant I - Grab Samples Nn. nf Samples Maximum ppm 17 6.0 16 0.30 9 0.22 9 0.9 11 0.6 9 0.24 810 12 0.40 87 0.24 864S6 0.32 12 0.24 13 2.6 1 0.16 1 5.7 1- ppm 0.52 0.06 0.06 0 15 0.14 U.U9 0.03 0.03 0.05 0.03 0.06 0.03 0.03 0.03 ' 0.03 0.11 0.03 0.22 0.03 1.48 0.17 6.15 0.03 Values corrected to standard temperature of 25C. frequency of VCM measured concentrations above 1 ppm. PBPLb- 2 0 0 0 0 0 0 0 0 0 0 0 0 0 O 0 0 0 0 2 0 1 0 . -n" ; ucc 011702 1 A through P were collected at two hour intervals with Tedlar (R) bags or syringes. The remaining sampling sites were those where detectable odors existed. Columns 3, 4 and 5 list the number of samples collected and analyzed, the maximum concentration of VCM found and the average at each site. The'Tast column was included to show the frequency that the concentration of VC exceeded 1 ppm. Over 90 percent of the values obtained were below minimum detectable values, 0.06 ppm. Figure 5.3.1 is a histogram of the observed data above the detectable level. In calculating the mean values, below detectable concentrations were arbitrorily given values of 0.03 ppm, one-half the minimum detectable level. Excluding the random samples, the individual values range from below detectable to 6 ppm. 5.3.1.1.2 Twenty four hour samples-Table 5.3.2 shows the average values .<f VCM in a 24-hour period that were collected on charcoal scrubbers. All data shown in the Table were corrected to ambient air standard conditions of 25C and 1 atmosphere. On May 10, the average value at site A exceeded 1 ppm. The report indicates, however, that although site A was 0.2 mile from the center of the plant, it may actually have been closer to the major source of PVC emissions. 5.3.1.2 Plant IV--At the present time only the data from the initial study and summary data are available. Table 5.3.3 shows the result of the data collected in March. Only three values exceeded 1 ppm, the highest was 2.2 ppm. The frequency.distribution of these values is shown in Figure 5.3.2. The sunmary of data collected in May around this plant are tabulated in Table 5.3.4. One ucc oino3 DRAFT FD NOT C!JOT[ OR CITC Table ^,1.2 CONCENTRATION OF VCM MEASURED IN INTEGRATED SAMPLES COLLECTED BY LHAKCOAL AbSORBER AT PlANT I, ppm ucc 011704 / Dir,FT c:quote oa cite Tible 5.3.3. CONCENTRATIONS OF VCM IN GRAB SAMPLES TAKEN AT PLANT IV IN MARCH 1974 UCC 011705 lUDic / iun or n.n in tiHAU bAMPLfc COLLECTED AT PLANT II IN MAY 1974 . i"' f' ` T ............c Site A B C D E H I L N P Q R > T U V Distance, kftt * 0 0.6 0.6 0.6 0.8 0.5 1.3 1.3 1.0 0.6 0.8 0.5 0.6 1.0 1.0 0.2 Number nf Samples 6 21 ''"-21 19 2 3 2 2 1 8 12 83 i 3 3 1 Maximum, nnm 1.7 5.6 5.8 2.8 0.10 1.2 1.6 BD BD 0.08 1.7 33.0 1.2 0.57 BD BD Mean , pp' 0.33 1.6 0.71 0.34 0.0? 0.50 X.00 BD BD 0.06 0.34 3.15 i* i0 0.21 BD BD 1 6 ucc 011706 x Frequency, percent liVHQ o Coo Figure t.3.i. Histogram showing frequency distribution of VCM grab samples concentrations at Plant I. Concentration VC, ppm m V: 3 oO 5.J.C3 28 : ; 32 j: 28 l. i :' i..: r x 11:....: 29 -i 20 i s ca3Ot" 16 at-t 12 --^ II :i E. i f.: :: : 4 : fl-ci 0 1--L f~L Figure 5.3.2. ' Histogram showing frequency Distribution of VCM Grab Sample Concentration for Plant IV (X 0.33,w0.40). r\ T3 -1 .a > r 'i pnT tr. r* ra ki r: ^ [i ?; f. l; r- v, rv n t to !fi r> r- rn jn r: -- t tl tq S. fcj 3 } --L c oO CO L> ! AM c: HOT QUOTL CS CME Instantaneous value of 33 ppm was observed at a distance of 0.5 km from the plant, and one mean value at site B exceeded 1 ppm. The data from the 24-hour Integrated samples Indicated the highest value to be 0.55 ppm (Table 5.3.b. 5.2.1.3 Plant VI--Here agairv^only summary data are available. Table 5.3.6 ana M$ure &.J.J. (.show the observed values at various distances from the plant, and the frequency distribution of these data. Only three values exceeded 1 ppm. The range of concentration at the property line was from below detectable levels to 7.8 ppm. 5.2.1.4 Plant IX--The most complete report was provided by Region IX which was prepared in cooperation with the National Field Investigating Center - Denver. However, the data (Table 5.3.7) proviaec were from samples on charcoal and are 10 minute averages instead of instantaneous samples; and hence this data is not comparable with the preceding. Under these conditions, values as high as 3.4 ppm were found at a distance of 4.8 km from the plant. Only 12 of the 180 determinations exceeded the 1 ppm level. The overall mean value calculated was 0.24 + 0.44 ppm. 5.3.2 Sunmary Since a great deal of latitude was excercised in implementing the prescribed procedures, it is difficult to compare the data from different plants. Based upon the available data, peak values as high as 33 ppm might be expected in the vicinity of VCM emission sources. All values obtained are expected to be biased negatively. 1 S <7 UCC 011709 DRW'/ 1JHAI- f R CITE 00 KOI QUOTE OR CITE NOT Table 5.3.5. CONCENTRATION OF VCM IN 24-HOUR AVERAGE SAMPLES Site MSD '' NFL SOP DPT CP Distance, km 0.6 D;e 0.3 0.2 1.0 VCM, P 0.16 0.07 0.55 0.10 0.01 5 /; ucc 011710 DRAFT DO NOT QUOTE OR CITE Table 5.3.6. CONCENTRATION OF VCM IN GRAB SAMPLES TAKEK AT PLANT VI, ppm 4.0 o.on.: o. on i o.ooo 0.00 2 aBelow detection. UCC 011711 UfiG JUM-U-i aIwJVt>w'GU TABLE 5-3-7PLANT IX - Integrated - 10 Hirute Average as Charcoal Samples 'a Station Number Run number 70 7; 72 73 t * 75 75 77 7.i 73 83 Aver15c II 2.4 0.05 0.53 t* ro 0.10 0.23 0.05 0.C3 0.10 0.C4 0.07 0.03 ,0.C3 0.12 io.53 12 1.8 0.15 0.C5 0.29 0.11 0.15 0.43 0.04 0.19 0.24 0.10 0.11 0.24 3.18 3.43 13 2.4 0.24 0.C4 0,05 0.03 0.16 0.C3 0.02 0.29 0.03 0.85 0.05 0.C6 0.16 0.85 14 4.5 0.23 0. Co 0.C4 0.04 0.04 0.05 0.02 0.11 C. 32 0.18 0.03 0.25 0.12 0.32 Distance from source, km 15 16 17 4.3 5.0 5.0 0.25 0.25 ; 0.06 0.31 0.03 0.14 1; <0.05 0.08 . 0.33 0.06 0.12!1 0.10 1 |1 0.20 0.13 0.29 0.45 i 0.21 0.16 ,3.4. 0.05 j 0.06 _LL 1.6 0.03 ----r 3.1 ' 1 ri i 0.05 i 0.40 1 0.10 1 0.03 0.04 0.16 0.06 _2Q_l 1.1* 1.4* 0.8 ! X i.d 1.0 ! 2.1 r1 0.11 ; 1 0.02 1 i 0.08 ' i 0.37 ;i 2.1 0.11 1 0.05 1 0.04 ; 0.26 0.03 11 1 0.21 ! 0.02; 0.05 \ 0.C5 j 1 0-11 : 0.C5 ; 0.03 r r> * 0.02 ; C.03 I 1.0 ; 0.10 /; 0.34 i i o.;s !1 o.ci 0.0J I 0.11 { 1.2 ; fU* . , J 0.05 0.07 i -03 0.25 ! 0.C5 1 0.C3 0.06 0.22 *1.1 0.15 0.07 ! 0.43* 0.55 0.04 j 0.53 0 98 0.16 1 0.36 0.45 : 0.07 0.04 0. C 5 | 0.15 0.03 1.4 ! 0.69 0.26. i 0.17 0.07 | 0.03 1.2 0.02 0.08 0.02 |0.10 0.31 0-12 0.03 0.04 0.33 0.05 0.05 1.7 ! [ 0.02 1 0.02 1 | 0.06 1 0.08 } 0.24 0.03 j 0.G4 ! 1.0 i 0.03 1 0.07 ,o.e4 . 0.50 i 0.03 . 0.:4 > 0.03 i1 1 0.C2 ! 0.05 ] 0.05 1 Q.C3 C.07 *0.15 Il.l 0.33 0.28 0.25 10.53 ! 10.26 ! 0.36 ,0.14 |0.30 0.15 '0.33 C.12 1.2 1.4 3.4 2.7 I1*7 ' 2.1 10.45 il.l 10.50 '1.3 :.4B n 0I 0 1 1 1 1 .2 ; 0 2 0 c C O __ L J___ S3.CEO ri I CJ.S3 IV.B | 2,2 tzd.a i i .a . n *7JB . :t a.cs I .B \ S. o --i is =*5 Figure 5.4.5. Histogram of Frequency Distribution of VCM Grab Sample Concentrations at Plant VI. (X 0.5, r- 0.40) 011713 Di<M-1 / DO NOT QUO II. 0.: T r[ Grab samples are expected to lose quantities of VCM due to continuing reaction in the sampling container, wall loses, leaks, etc. Indication of VCM losses in these containers range from 0 to 10 percent per day. Losses of VCM while using charcoal are expected to be larger than in the containers. Collection efficiency and recoveries have not been definitively established. Preliminary data indicate recoveries of 71 to 76 percent when extraction by CSg is used to recover the VCM from charcoal. For 7 data points in which samples were collected in parallel and analyzed by two different laboratories, the values disagreed markedly. The relative standard deviation about the mean ranged from 5 to 140 percent. UCC 011714 DO NO- nL'r.v* '! fC Table 5.3.8. CONCENTRATION OF VCM MEASURED IN INTEGRATED 24-HOUR SAMPLES COLLECTED BY CHARCOAL ABSORBER AT PLANT IX, ppm Distance, km Clate 5/7/74 5/8/74 5/9/74 1.1 0.08a 0.07a 0.10a 1.3 0.08 0.08 0.05 3.1 -- 0.06 0.05 4.3 -- 0.06 0.05 4.5 0.27 0.65 0.27 5.3 0.07 0.04 0.05 al2-Hour Samples ucc 011715 DRAFT DO NOT QUOTE OR CITE 5.4 tbYlMAftb OF AIR QUALITY CONCENTRATIONS Estimates of vinyl chloride concentrations downwind of two plant sites were made using available emission estimates and reasonable meteorological conditions. The estimates were made using Gaussian dispersion techniques given in EPA's Workbook of Atmospheric Dispersion 1 Estimates. Concentration estimates are for 1-hour averaging times. Considering possible errors in emissions and dispersion uncertainties, the estimates may be expected to be within a factor of 3 or 4 of concentrations that would be measured under the same meteorological conditions at the same receptors with accurate sampling equipment. Table 5.14 shows the results of the estimates for four different emission conditions. Wind speed was held constant at 2 m/sec for all calculations. Since * concentration 1$ inversely proportional to wind speed, a higher wind speed would decrease the estimates; a lower wind speed would Increase the concentrations estimates. Wind speeds lower than 2 m/sec occur fairly often, on the order of 3 to 15 percent of the time; at most locations Three different atmospheric stabilities were considered. D, or neutral, stability occurs during day or night when cloudy skies prevail. This stability also occurs during the transition from unstable daytime conditions to stable nightime conditions and vice versa. E, slightly stable, and F, moderately stable, both occur at night with clear skies and light winds. These three meteorological conditions can be expected to occur during quite a number of hours In a given year. ucc 011716 \)\\>\ oc MMUf\TI (Mjn TL **\ * , CITE Receptor locations in these model calculations were placed at positions downwind of the approximate center of the sources and off the plant property. For plant A, a computation was made considering the emissions from 5 point sources of varying"heights and from one area source. These sources are all located within 200 meters of each other. From the top portion of Table 5.4.1, it is seen that the predicted maximum hourly concentrations do not differ greatly for the three stabilities, and are the highest, 4 ppm, for F stability (moderately stable). Maximum 24-hour concentrations would be much lower. Concentrations resulting from this plant were also estimated when a reactor is aborted and over 2270 kg of VCM is vented to the atmosphere in about 10 minutes. Venting such as this would occur approximately 20 times each year in a PVC plant. Other emissions were assumed to remain the same as in the above calculation. Under these conditions a maximum hourly concentration of 29 ppm was predicted to occur under D stability at 400 meters. Since the other sources contribute less than 3 ppm at this point, the vented release contributes about 26 ppm at this point. Since the release occurs over only a 10 minute neriod, a much higher concentration with instantaneous peaks 5 to 10 times this concentration, 130-260 ppm, might be expected, based on these calculations, to occur at this receptor as the pollutant cloud passes. Concentrations at least 5 times higher, 133 ppm, might occur over a 6 to 10 minute averaging time at this receptor according to these estimates. Beyond 5.0 km the impact of a spill would be minimal. For both the spill and non-spill situations, the populations most affected would be those residing within about 2 km of the plant. UCC 011717 Table 5.4.1. CALCULATED 1-HOUR AVERAGE CONCENTRATIONS OF VINYL CHLORIDE AT SELECTED DOWNWIND DISTANCES FROM A PLANT WITH MULTIPLE'EMISSION SOURCES Distance from plant, km Stability jclassc No spill With spill1 Concentration, pprftb Stability c.lassd * No spill With spill1 Stability class6 ^ No spill With spill -j U-- Of. f> o > f 0.25 0.4 0.5 0.8 1.0 2.0 3.0 5.0 3.5 18.2 3.8 3.8 4.0 4.0 2.9 29.3 3.4 4.4 3.9 3.9 2.6 28.2 3.2 6.1 3.7 4.0 1.7 19.4 2.5 10.9 3.2 7.1 1.4 14.9 2.1 11.8 3.0 9.5 0.6 6.0 1.1 8.2 1.9 11.8 j 0.4 3.4 0.7 5.4 1.3 9.3 / 1 0.2 1.6 0.3 3.0 0.8 5.9 i Emission conditions: Source Emission type rate,g/sec Point Point Point Point Point Area9* Spill1 18.9 0.63 6.3 8.8 0.5 44.1* 3783.3t Height of emission, m 22.9 15.2 7.6 30.5 38.1 6^ 15.2 "All calculations assume 2.0 m/sec windspeed. cNeutral conditions ^Slightly stable. eModerately stable. ^Spill of 2270 kg of vinyl chloride released in 10 minutes at a height of 15.2 meters at 338K (65QC). ^Emissions from a building 110 by 170 m through vents and windows about 6 m from the ground. o coo oo oo o --I oo 2 o3 zo 2 *--"nI / rTViX'\ do no r Q'dO'i <. ** 1; CITE Table 5.4.2. CALCULATED 1-HOUR AVERAGE CONCENTRATIONS OF VCM AT SELECTED DOWNWIND DISTANCES FROM A PLANTS WITH MULTIPLE EMISSION SOURCES uiseance ^ Stability U- downwind Average . Peak (Kn) emissions0 emissions Concentration Stability E Average . Peak emissions0 emissions Stability F Averaqe . Peak emissions0 emissions 0.2 0.3 0.4 0.5 0.8 1.0 2.0 3.0 4.0 5.0 10.0 15.0 20.0 2.2 1.8 1.6 1.4 1.0 0.8 0.4 0.3 0.2 0.1 <0.1 <0.1 <0.1 2.8 2.4 2.2 2.1 1.7 1.5 0.8 0.5 0.3 0.3 0.1 <0.1 <0.1 2.8 2.5 2.2 1.9 1.5 1.3 0.7 0.5 0.3 0.3 0.1 <0.1 <0.1 3.3 3.0 2.7 2.4 2.1 2.0 1.3 0.9 0.7 0.5 0.2 0.2 <0.1 3.1 3.6 3.1 3.7 2.9 3.5 2.7 3.2 2.2 2.7 2.0 2.4 1.2 1.9 0.9 1 .5 0.7 1.3 0.5 1 .0 0.2 0.5 0.2 0.3 0.1 0.2 aAll calculations assume 2.0 m/sec wind speed ^Average emissions: Point source -- 24.0 g/sec. at 33.5 m. Area source 1 -- 21.4 g/sec from 150 by 150 meter building. Assume emission at 6m. Area source 2 -- 14.4 g/sec. from 180 by 15 meter building. Assume emission at 6m. cPeak emissions: Point source -- 90.5 g/sec. at 33.5m. Area source 1 -- Same as under average emissions. Area source 2 -- Same as under average emissions plus a 2 minute spill of 24,000g. (2000g/sec). *1 ucc 011719 For Plant B, one point source and two area sources were considered under two dtfferenct conditions, average emissions and peak emissions. Three emission sources are assumed located within 300 meters of each other In this calculation. In this case the maximum concentrations are not increased greatly by^n Increase of a factor of three in the emissions from the elevated point and/or by a 2 minute spill from the area source. However, note that the concentrations are nearly doubled at greater distances downwind. For Plant B the maximal concentration, 3.7 ppm, is almost the same as that from Plant A under normal conditions, 4 ppm. </- r ucc 011720 / f REFERENCES 1. Turner, D.B. Workbook of Atmospheric Dispersion Estimates. EPA, Research Triangle Park, N.C. Publ. No. AP-26, 84p, 1970. 1 J\ S- 4/- 4> UCC 011721 Hi {' I DQwoTQwrr: 5.5 TRANSFORMATION, TRANSPORT, AND REMOVAL No results on the reactions and rates of disappearance of vinyl chloride from the ambient atmosphere are available at present. Limited laboratory studies orv the stability and persistence of vinyl chloride In air have, however, been completed. In addition measurements recently reported on vinyl chloride in water and sludge indicate that vinyl chloride dumped Into aqueous media are probably lost to the air relatively rapidly. Vinyl chloride vapor concentrations In containers of various materials appear to be essentially constant over periods of many days. The peak absorption of vinyl chloride in the ultraviolet region is very far below the solar cutoff around 290 nm so VCM would not undergo reaction in sunlight In the absence of other reactive chemical species. When Irradiated with simulated solar radiation in the presence of nitrogen oxides (nitric oxide and nitrogen dioxide), vinyl chloride In the parts per million concentration range does react to form a variety of products. The available results indicate a rate of reaction of about 8 to 10 percent per hour for vinyl chloride. The reaction products Identified Include ozone, nitrogen dioxide, carbon monoxide, formaldehyde, formic acid, formyl chloride and hydrogen chloride. Several of these products are very Irritating. r{ ucc 011722 / DO NOT QUOTE t'F. Although vinyl chloride would disappear significantly in traveling over longer distances, the conversions anticipated within a few kilometers downwind of vinyl chloride emission sources would be small. No mechanism is presently known for-removal of vinyl chloride from the air during the nighttime hours. Biological sinks such as micro biological removal in soil may be of significance in depletion of vinyl chloride over long time periods, but such sinks would not be expected to be important In terms of urban scale transport of vinyl chloride. Thus, for a first approximation, vinyl chloride in the immediate vicinity of vinyl chloride emission sources can be considered a stable pollutant. The usual meteorological dispersion equations could thus be applied to approximate concentrations in the vicinity of emission sources. Because of strong radiation Inversions at night during the fall and winter build-up of vinyl chloride from emission sources might be of particular concern during such periods. The noxious gases which are products of vinyl chloride reactions (and cosslbly also from other chlorinated chemicals In industrial 7 f production) should not be ignored. In areas with large Industrial activities Involving large volume production of these \ chemicals, such products may contribute appreciably to eye, nose, throat and lung irritation, particularly on sunny days. t' *> ucc 011723 U'\nr i DO NOT QUOTE Oft CITE 6. ENVIRONMENTAL EXPOSURE AND RECEPTOR RISK Human exposure to vinyl chloride may occur from air inhalation, from consumption of food, from Intake of water containing vinyl .chloride, and from skin contact. The data available suggest that the airborne exposure route In generaT'represents the greatest source of vinyl chloride Intake for the population. The highest exposures to vinyl chloride occur in occupational situations where the vinyl chloride is manufactured and where the vinyl chloride monomer, a gas at room tem perature and atmospheric pressure, is converted to a polymer. Workers Involved In the polymerization process and In the fabrication of PVC into end products may be exposed not only to vinyl chloride In the gaseous phase but may also Inhale PVC dusts containing entrapped vinyl chloride monomer. In this regard PVC particles containing vinyl chloride may be deposited in tissues.1 To date there is not adequate Informatior on general or occupational population exposure to PVC particles in the air. Peak exposures to vinyl chloride In occupational situations may at times in the past have exceeded 1,000 ppia as for example during reactor cleaning operations,2 although the highest time weighted average exposures 4a were probably in the 250-500 ppm range/'* The threshold limit value for set at vinyl chloride was at one time/500 ppm based upon its narcotic properties. After reports of liver damage due to vinyl chloride at exposures below 500 ppm were available the TLV was reduced to a 200 ppm time weighted average exposure for a forty-hour work week, with a 500 ppm ceiling for C- i ucc 011724 peak exposures.5,6 DRAFT UO NOT QUOTE CT Cl fE When it became evident from animal studies that vinyl chloride produced angiosarcoma of the liver at exposures as low as 250 ppm, and when cases of liver angiosarcoma were reported from workers in PVC production plants, an emergency ceiling TLV of 50 ppm was established and a recommendatidn-toset a permanent standard at a no detectable limit based upon an analytical procedure capable of detecting vinyl chloride at concentrations of 1 ppm was made by the Department of Labor.6 That reconmendatlon has recently been modified and a permanent standard promulgated which calls for a maximum 8-hour worker exposure to vinyl chloride of 1 ppm with peak 15 minute exposures not to exceed 5 ppm. Since establishment of the 50 ppm emergency standard additional animal studies have shown vinyl chloride to be a carcinogen in experimental animals at 50 ppm exposure levels.6'^ These data are reviewed more fully in the following sections. Among the general population not Involved directly in VC/PVC manu facture and product fabrication, the greatest sources of vinyl chloride exposure are estimated to be or to have been from aerosol products containing vinyl chloride propellants and from atmospheric emissions in the vicinity of industrial sources. Studies on vinyl chloride aerosols used in home O situations indicate that peak exposures in excess of 100 ppm can occur. Time weighted average air exposures to vinyl chloride in aerosol products would, of course, depend upon the frequency and conditions under which these products were used. To date over 100 aerosol products have been identified which either contained or currently contain vinyl chloride. For populations residing in the vicinity of Industrial sources pre liminary date, described earlier, show peak exposure of 33 ppm and 24-hour samples as high as 1-2 ppm. Over 90% of samples, both peak and Q 24-hour measurements, were below 1 ppm. it should be noted that the (~ ucc 011725 1 / risk to health may be related to the exposure pattern to vinyl chloride', l.e. intermittent peaks, a 40-hour exposure each work week cr a continuous low level exposure. Vinyl chloride concentrations of 2-3 ppm and at times higher have been recorded from manufacturing plant effluents, although it is unlikely that such contamination would persist in water downstream which might be used for drinking purposes, due to the tendency for vinyl g chloride to escape from water into the air. Water contamination with vinyl chloride from PVC piping may be a problem although available data do not Indicate this to be the case. To date, there is no indication that drinking water contains detectable levels of vinyl g chloride. Food, either beverages or solids packaged in PVC containers, may contain vinyl chloride as a result of leaching, but the ful extent of such a potential problem Is at present unknown. A World Health Organization Report tentatively estimates that human intake of vinyl chloride, based upon a limited range of food is on the order of 1 ug per person per day. For the general population, it is impossible to quantitate the relative importance of various vinyl chloride exposure sources on an individual basis based upon current data. However, if tne assumptions regarding levels of contamination are correct, tne relative Importance of these sources can be estimated. This estimate and the assumptions In these calculations are shown in Table 6.1.1.Conclusions drawn from this analysis are, of course, dependent upon the assumptions which are made. These estimates assume equal absorption of vinyl chloride from food and water in the gastrointesti nal tract compared to vinyl chloride absorbed by the lungs from the air. UCC 011726 / DRAFT rr 00 NOT QUOTE OR CITE Table 6.1.1 RELATIVE IMPORTANCE OF VINYL CHLORIDE SOURCES FOR THE GENERAL ADULT POPULATION (mg VCM) Food^ 0.002 Water2 Air3 3.0 Total 3.002 lAssume 2 Kg ingested daily containing an average of 0.001 ppm VCH by weight resulting in an intake of 2 ug/day. A World Health Organization Report estimates the levels of vinyl chloride In food may be on the order of 1 microgram per person, per day, based upon tentative calculations from a limited range of foods. 1 ^Assume 2 liters ingested daily containing no detectable levels of VCM. To date there is no indication that drinking water contains detectable levels of vinyl chloride. ^Assume inhalation of 20 m3 per day containing 0.05 ppm vinyl chloride by volume. ,h ucc 011727 DRAFT 00 MOT QUOTE Of! CM This may or may not be true. Based upon these calculations. It Is evident that the airborne source. In general, can be considered the most important route of exposure to this substance among the population. Specification of the risk to health among the general population associated with the given airborne-exposure to vinyl chloride Is ex tremely difficult in large part due to the lack of Information regarding responses to vinyl chloride at ambient dose levels In both animals and man. Further, the data available, regarding adverse effects attributable to vinyl chloride in man do not include adequate measures of exposure which may have been responsible for such damage. 1 In considering the risk to human health from vinyl chloride exposure in the population. It Is Important to keep in mind that angiosarcoma of the liver, though an invariably fatal disease, is not necessarily the most significant health effect associated with vinyl chloride. Other cancers may also be Involved and non-malignant damage to the liver may affect a far greater proportion of the exposed population than those who develop angiosarcoma. To date angiosarcoma of the liver has been con sidered an extremely rare disease among the general population. In a survey by the American Cancer Society only one case of angiosarcoma ucc 011728 / :T/ rlj>n.v*. fV*> * ' i: O' I'lTP of the liver was recorded among 78,000 deaths. 12 However, the possi bility that the frequency of this disorder has been greatly under estimated must be considered. Shown in Table 6.1.2 are the results of several studies examining the frequency of liver angiosarcoma among workers exposed to vinyl chloride. Table 6.1.2 FREQUENCY OF LIVER ANGIOSARCOMA AMONG DECEASED VINYL CHLORIDE WORKER^13-1 Number of Deaths a13 b14 c15 d16 Total 161 24 20 109 314 Reported Frequency of Liver Angiosarcoma Number Percent 5 3.1 3 12.5 -_6_ 5,5 14 4.5 While it is likely that these reported cases of liver angiosarcoma occurred among workers exposed to levels of vinyl chloride many times greater than that normally found in the ambient air, it is also noteworthy that compared to the general population (1 case in 78,000) the relative risk of developing liver angiosarcoma among those exposed individuals by combining all these data is estimated to be approximately 3,000 times greater. Such a relative risk represents a striking UCC 011729 / DRAFT cc not quo if o" art statistically significant difference (p << 0.01) in the frequency of liver angiosarcoma among those exposed to high levels of vinyl chloride compared to those in the general population exposed to much lower levels. In attempting to assess trends in incidence of liver angiosarcoma among the population, it is important to recognize that other chemicals besides vinyl chloride may be contributing to such a phenomenon. Included in such a list would be materials with similar chemical structures to vinyl chloride as well as arsenicals and thorotrast, both of which have already ,. (17-18) been associated with angiosarcoma of the liver. UCC 011730 rt / 6.1 REFERENCES 1. Volkheimer, G. Hematogenous Dissemination of Ingested PVC Microparticles. Paper presended at the Working Group on Toxicity of Vinyl Chloride-Polyvinyl Chloride, the New York Academy of Sciences, New York City. May 10-11, 1974. 2. Rowe, V.K. Experience in Industrial Exposure Control. Paper presented at the Working Group Toxicity of Vinyl Chloride-Polyvinyl Chloride, The New York Academy of Sciences, .New York, May 10-11 ,1974. 3. Daniel, Roger L., Dow Chemical Company Testimony presented at Public Hearing - Proposed Standard for Occupational Exposure to Vinyl Chloride, U.S. Department of Labor, Washington, D.C., June 25, 1974. 4. Demehl, Carl V., Associate Medical Director, Union Carbide Corpora tion. Testimony presented at Public Hearing - Proposed Standard for Occupational Exposure to Vinyl Chloride, U.S. Department of Labor, Washington, D.C., June 25, 1974. 5. Key, M. Introductory Remarks. Presented at the Working Group Toxicity of Vinyl Chloride - Polyvinyl Chloride, The Hew York Academy of Sciences, New York City, May 10-11, 1974. 6. Federal Register. Vol 39, #92, May 10, 1974. pp. 16896-16900. 7. Maltoni, C. and G. Lefemine. Carcinogenicity Bio-Assays of Vinyl Chloride: Current Results. Paper presented at the Working Group Toxicity of Vinyl Chloride - Polyvinyl Chloride, the New York Academy of Sciences, New York City, May 10-11, 1974. /, i UCC 011731 *rr L'i-./u r c: rw: quote or cite 8. Gay, 3., W. Lonneman, K. Bridbord and J. Horan. Exposure to Vinyl Chloride In Aerosol Products, jsper presented at the Working Group, Toxicity of Vinyl Chlordie - Polyvinyl Chloride, The Jew York Academy of Sciences, Hew-Tork City, May 10-11, 1974. 9. EPA Urges Prompt Steps by Chemical Industry to Reduce Vinyl Chloride Air Emissions. Environmental News, EPA, Washington, D.C., June 11, 1974. 10. Wagoner, Joseph, NIOSH. Testimony before United States Senate, August 21, 1974. 11. Report of a Working Group on Vinyl Chloride, World Health Organization. IARC IntemJ. Js&lyilcal. Report Uo. 74/005, Lyon, June 24-25, 1374.,, 12. Selikoff, Dr. I.J. Testimony Presented at Public Hearing - Proposed Standard for Occupational Exposure to Vinyl Chlordie, U.S. Department of Labor, Washington, D.C., June 25, 1974. 13. Menson, Richard R., John M. Peters and Maurice N. Johnson. Proportional Mortality Among Vinyl Chloride Workers. Lancet, pp. 397-398, August 17, 1974. 14. Nicholson, William J., E. Cuylor Hammond, Herbert Seldman and Irving J. Selikoff. Mortality Experience of a Cohort of Vinyl Chloride Workers. Paper presented at Working Group on Toxicity of Vinyl Chloride - Polyvinyl Chloride. New York Academy of Sciences, New York City, May 10-11, 1974. 15. Holder, Ben. The Dow Chemical Company Testimony Presented at Public Hearing--Proposed Standard for Occupational Exposure to Vinyl Chloride. U. S. Department of Labor, Washington, D.C. June 25,1974. 1 UCC 011732 DRAFT I\ T I nj rI QUOTE OS CITE 16. Wagoner, Joseph K. National Institute of Occupational Safety and , Health Statement Presented before the Subcommittee on the Environment Cnmmerro ii <; Sonat.p. Washington, D.C., August 21, 197* 17. deSilvo Horta, J., J.D. Abbott, L. Cayolla da Mutta, and M.L. Roriz. Malignancy and Other Late Effects Following Administration of Thorotrast. Lancet 2:201-250, 1965. 18 Regelso, W., V. Him, J. Ospina, and J.F. Holland. Hemangioendothelial sarcoma of Liver from Chronic Arsenic Intoxication by Fowler's Solution. Cancer, 21:514-522, 1968. 1 ucc 011733 / / rnr r ;v . DO 7.1 TOXICOLOGY 7.1.1 Introduction The effects associateii'Wtth vinyl chloride exposure include narcosis associated with acute exposure, and liver and low grade kidney damage similar to that associated with other halogenated aliphatic hydrocarbons. Acroosteolysis has also been observed among workers exposed to vinyl chloride. This disorder is characterized by degeneration of bones in the fingers and has been associated primarily with direct contact with polymerized material (PVC) and high levels of gaseous monomeric vinyl chloride. 1 This response Is unique among the occupational hazards resulting from exposure to the aliphatic chlorohydrocarbons. The recent discovery that vinyl chloride induces carcinogenic changes in experi mental animals and the appearance of liver angiosarcoma among PVC workers also appears to be a response to vinyl chloride exposure. 2-7 Although there has been no systematic quanitative assessment of the toxicity of the many halogenated hydrocarbons, vinyl chloride has until recently been considered one of the least toxic of the aliphatic chlorohydrocarbon chemicals. *** Carcinogenic activity of vinyl chloride has been confirmed in several species of experimental animals and associated with both acute and chronic low level exposure when the experimental period was sufficient in time to permit tumors to appear.^" The appearance of hepatic angio sarcoma, malignant lesion in the liver of experimental animals,and the discovery that this equally rare lesion in man is associated UCC 011734 / 00 HOT QUOTE OR CITE with occupational exposure to vinyl chloride circumstances has served to underscore the predictive value of experimental toxicology. Questions have also been raised regarding the safety of'Other chemicals structurally related to vinyl chloride that traditionally have been considered of low order O toxicity. A literature review of the toxicology of vinyl chloride 9 has recently been presented by Marsteller et al, 1974. A summary of this information is presented in Appendix B. Since vinyl chloride is now a recognized chemical carcinogen that has been detected in the ambient air near monomer and polymer production facilities in the United States, its presence in the environment represents a potential public health hazard. 7.1.2 Acute Effects The early experimental toxicology of vinyl chloride was limited to acute exposures. These early studies employed a variety of experimental animals and were limited to very short exposure periods. The results of these studies have been reviewed by von Oettingen,11 10 fit al* g and more recently by Marsteller et al. Mastromatteo In general, these investigations suggested vinyl chloride was of low order acute toxicity, anesthetic in action, and had little capacity to cause injury to the liver or kidneys* The duration of tnese exposures ranged Trom minutes to hours. These observations led to consideration of vinyl chloride for use as a general anesthetic?. The anesthetic effects were often accompanied by UCC 011735 cardiac irregularities with some suggestion of cardiac sensitization. The effective narcotic level in mice exposed to vinyl chloride for one minute ranged from 86,000 to 123,000 ppm. Approximately 170,000 ppm was required to induce narcosis in dogs and rabbits over the same exposure period. Cardiac irregularities were observed in electrocardio grams of dogs exposed to 100,000 ppm for less than 4 hours. In addition, the observation of other side-effects suggested further systemic disturbances associated with acute exposure. Guinea pigs exposed to 5,000 ppm of vinyl chloride for a 30 t0 60 minute period displayed pulmonary edema and hyperemia (excess blood) in the kidneys and liver on autopsy? 11 Although all pathological parameters appeared normal in rats exposed to vinyl chloride levels up to 100,000 ppm over a thirteen day period, advanced lymphocytic hyperplasia Vi of the spleen was observed.. At lower exposure concentrations and extended exposure periods (50,000 ppm; 19 days). Increased liver size was observed . , , ,, , ,12 examinations in these experimental animals (Sherman rats). Pathological / revealed con- jestion at the cellular level in the liver of these experimental animals; however, parasitic cysts were also observed in the liver of these I animals which confounds ` conclusions regarding acute effects an<* systemic damage associated specifically with vinyl chloride exposure. Although the results available suggest only marignal systemic effects, there are some indications that vinyl chloride is not simply absorbed and exchanged in the lungs but distributed throughout the body with pathological alterations observed in the liver Sidneys and spleen. Therefore, effects such as pulmonary edema, tracheal irritation, hyperemia of the ucc 011736 / DRAFT ' CO ?;07 QUOTE OR CITE liver and kidneys, cardiac arrhythmia and hyperplastic chanaes in t.hp spleen and liver may be subtle side effects of acute vinyl chloride exposure that suggests functional interaction In various organs and , systems of the body. A summary of these and other experiments are presented in Appendix B. - 7-1*3 Chronic Inhalation Toxicology While investigations of short duration with high exposures are useful in determining lethality and gross toxicity, chronic effects associated with continuous or repetitive exposure to lower levels of vinyl chloride are more important in evaluating possible environmental hazards. Several Investigations designed to assess chronic effects associated with repetitive exposures to vinyl chloride began in the 13 early sixty's. Torkelson, Oyen and Rowe reported results of studies using several species of animals (dogs, Guinea pigs, rats and rabbits) exposed to levels of vinyl chloride ranging from 50 to 500 ppm. The results of these studies noted that all species of experimental animals exposed to vinyl chloride at 500 ppm administered daily 7 hours/day over a four and a half month period, were normal with respect to appearance, growth and mortality. While several blood parameters (serum enzymes) used to monitor functional disturbances of the liver were found to be within normal limits, there was an Increase in liver size observed in male rats that was not apparent in female animals. In addition, central lobular degeneration of the liver and renal tubular damage in the kidneys was apparent upon microscopic examination of the various tissues excised 1 UCC 011737 DRAFT / on ::: r q-sjote or cite from animals sacrificed at the end of the experimental period. Since considerable liver damage is required to alter serum enzyme levels used to monitor liver function,' histopathologic changes such as those observed in these studies may be an important parameter in evaluating beginning liver damage which might not be detected by serum enzymes. Similar effects were observed in the liver of male rabbits exposed to 200 ppm of vinyl daily chloride administered for 7 hours / over a six month period wlth necrosis ana periportal cellular infiltration in the liver was not observed in the females. This observation suggests a sexual difference in the response of male and female rabbits to vinyl chloride and alludes to a possible hormonal influence. Other experiments sugqests 17-19 that carcinogenic agents may modulate the activity of steroidal hormones . While the liver of male and female rats remained increased In size at this dose level (200 ppm), no apparent microscopic- pathology was observed.There were no apparent kidney disturbances noted among the various animals exposed to this dose level (200 ppm). Increased liver size was sustained even when exposure was reduced to 100 ppm for 2 hours daily over the 6 month period of the experiment. However, it is important to note that ucc 011738 DRAFT OC K'T QUOTE OR CITE liver to boay weignt ratios wore nor. statistically different from controls at these lower dose levels. A further reduction in exposure to 50 ppm for 7 hours per day for 5 Havs ner week administered over a 6 -month period produced no evidence of liver size abnormalities 111 ' or microscopic appearance in these experimental animals. Despite the lack of statistical' significant, these toxicologists placed sufficient weight on their observations of subtle liver damage observed in several animal species to recommend adjustments in the established industrial standards for permissible exposure to vinyl chloride as early as 1961. The experimental protocols used in this investigation were limited to a six month period and did not reserve treated animals for longevity studies. It conceivable that carcinogenicity of vinyl chloride would have been known nearly fifteen years ago had the effects of longevity been studied in these early studies. (2,20,21 1 . . ., Attempts by Viola et al.- to develop an animal model to investigate the pathogenesis of acroosteolysis revealed convincing evidence of systemic toxic effects in a wide variety of organ systems. These subacute studies provide a more complete description of systemic effects associated with exposure to high concentrations of vinyl chloride monomer extended over a twelve month period. While attention is focused upon the liver of these experimental animals (Rats, Wistar strain) pathology was noted in the kidneys, arteries, skin, bones, brain,and nerves. A fibrosclerotic ucc 011739 / DRAFT DO t.'OT QUOTE OR CITE reaction appears to be a conmon denominator In the biologically Qiversr tissues of these various organs. A fibrotic lesion in the liver appears to be important in evaluating the pre-cancer state of liver angiosarcoma.^) These observations provided evidence of the permeation of vinyl chloride throughout the body and suggested interference with membrane structure (e.g. lipid peroxidation) with a compensatory repair response (endothelial proliferation). Carbon tetrachloride also produces a peroxidative degradation of structural lipids particularly in the There have been other published reports in the Russian and European literature that provide evidence of alterations in cardiac function, and hypertension,/increased adrenalin and neural activity in the brain of several animal species subjected to low chronic exposure levels of vinyl chloride (Appendix B). These experiments suggest the possibility of cardiac disturbances and behaviorial changes in man exposed to ,, 25 vinyl ,,nt'er occimational circumstances. uCC 011740 DRAFT CO r:CT QUOTE OR CITE A summary of chronic systemic effects from inhalation of vinyl chloride observed in experimental animals include: Alteration in liver function. There may be sexual differences / in nature of the response of the liver of male and female animals. A fibrosclerotic reaction in necrotic areas of the liver with evidence of a hepatic regenerative process has been noted. Therefore, vinyl chloride may be considered a chemical hepatotoxin. Disturbances observed in the circulatory system include irregularities in cardiac function, endothelial fibrosis in arteries and alteration circulating white blood cell levels. Hypertension has also been observed and may be related to Induced adrenalin activity similar to other aliphatic chlorohydrocarbons. a Exposure concentrations, duration of exposure and frequency of exposure appears to be important aspects that determine the nature and severity of toxic response. 1-i-i UCC 011741 DRAFT DO KCT Q'JOTt OR CITE The significance of the evidence from chronic studies appear \ to have been underra teds ioeejnany of these experiments have not been repeated on a large scale until recent discovery of carcinogenic activity. Although attempts were made to establish a dose-response relationship, there has been little or no data available to per mit quantitative analysis of the systemic response to vinyl chloride exposure. Qualitatively, it is important to recognize the significance of repetitive exposures and exposure durations that permit observations of time-dependent response phenomena. 2-5,12,13 ucc 011742 1. 7.1.4 Carcinogenicity- of Vinyl Chloride nr: aft , *.;,'t C3 r:Xr * uu There have been three investigations that deal with the carcinogenicity of vinyl chloride, Viola et al 2 Maltoni and Lefemine,^a and Keplinger et al 5 The first evidence of carcinogenic effects associated with exposure to 2,21 vinyl chloride was reported by Viola et al-"* These investigations involved twenty-five Wistar (AR/IRE) albino male rats (150 am body weight) exposed to 30,000 ppm of VCM for 4 hours a day, 5 days a week for 12 months. The tumors observed under these subacute exposure conditions are presented in Table 7.1 Although these experiments apparently were not specifically designed for Investigating carcinogenicity, there was sufficient evidence of a tumorogenic response to warrant further Investigation. Particular attention focused upon the following aspects of tumorogenicity of vinyl chloride in Wistar rats subjected to subacute exposure conditions: Tumor multiplicity with neoplastic lesions observed in several tissues. * The presence of Zymbal gland tumors. These sebaceous glands located in the ear of rodents are particularly responsive to other chemical carcinogens (e.g. acetyl-aminofluorine: AAF, polynuclear aromatic hydrocarbons: PNA such as 9,10-dimethyl1,2 benzanthracene; urethan; 4 amino-stibenes, benzidine). ^ UCC 011743 7 DRAFT CO c; QUOTE OR CITE \ S.ince the majority of tumors observed were epidermoid carcinomas of the skin, these investigators concluded that the cutaneous system (skin) was the system most susceptable to the oncogenic effects of ^ 'X vinyl chloride (Tables 7.T4_4nd 7,1.2) It is important to note, however, the absence of liver angiosarcoma in these animals subjected to high levels of vinyl chloride monomer for nearly half of their life-span. Therefore, a more comprehensive, quantitative and systematic series of investigations were initiated in Europe and the United States to confirm the carcinogenicity of vinyl chloride with particular emphasis placed upon the dose-response relationships in several studies of experimental animals. --\ / ucc 011744 draft r.OT QUOTE OR CITE Tables 7.1.1 TYPES OF TUMORS OBSERVED IN MALE WISTAR a RATS EXPOSED TO 30,000 ppm OF VINYL CHLORIDE Wistar Rats number t 2,3 4 S 4 6 7 8 14 16.17 21 22 23 24 25 26 Tumors Skin l.ungs Bones Mucoepidermoid carcinoma Epidermoid caicinoinj, kentinizing type Epidermoid carcinoma. kera tinizing type Papilloma, keratotic type Epidermoid carcinoma ' Epidermoid carcinoma . Mucoepidermoid carcinoma % Epidermoid carcinoroj . Epidermoid carcinoma , Epidermoid carcinoma Epidermoid aremoma Epidermoid cau inoma Epidermoid carcinoma EpiJerni'iid carcinonu Fptdcmund carcinoma Adenoucanthoma No tumor Adenocarcinoma No tumor No rumor No tumor No tumor . No tumor Adenocarcinoma No tumor Adenocarcinoma No tumor Mucus-producing adenocarcinoma (alveolar cell carcinoma?) * No tumor SqujnuMi\ cell . carcinoma Osteochondroma No tumor No tumor Osteochondroma Osteochondroma No tumor / O.teochondroma No tumor No tumor No tumor Osleocliondioma No tumor No tumor No tumor No tumor aInhalation exposures were conducted 4 hours/day, 5 days/week over a 12 month period From Viola. P.L. et al.2 7 UCC 011745 DRAFT DO NOT QUOTE OR CITE Table 7.1.2 TUMOR INCIDENCE IN MALE WISTAR RATS EXPOSED TTT VINYL CHLORIDE * Vinyl chloride ppm 30,000 Controls Total Animals 26 25 Skin 17 -- Tumors Lung Bones 65 -- -- Total 25 0 a Inhalation of 30,000 ppm vinyl chloride, 4 hours/davx 5 davs/week over 12 months* From Viola, P.L. et ai.(2) ucc Oil 746 / DRAFT DO MOT QUOTE OR CITE In Europe, additional investigations began in late 1971 under the auspecies of Maltoni and Lefemine.4 A series of 14 correlated and integrated experiments were designed to elucidate the relationship -of vinyl chloride carcinogenicity to route of administration, exposure concentration, length o`f exposure, species response variation and age dependent effects. The basic design of these studies placed particular emphasis upon controlled exposure conditions and a compilation of a tumor ' incidence profile from observations over the entire life span of the experimental animals in response to inhalation of vinyl chloride of high purity (99.99percent). The preliminary results of this initial study have been reported (Table 7.T.3. The percentage of Sprague-Dawley rats with various types of tumors observed following cessation of vinyl chloride exposure at various dose levels is presented in Figure /. 1 -- The information available from these early studies indicate that vinyl chloride carcinogenicity is dose-dependent. Total tumor incidence appears to decrease with decreasing concentrations of vinyl chloride and was also observed to be dependent upon duration of exposure as well as concentration. Liver angiosarcoma and nephro blastoma of the kidneys of these Sprague-Dawley rats do not appear to be as concentration-dependent as the generalized tumorogenic response (Figure 7.1.1). These investigators suggest that liver angio sarcoma and nephroblastoma may be more dependent upon duration of exposure than upon the concentration of vinyl chloride administered. The basis for this suggestion stems from the observation that UCC 011747 / r p * rr JPNvA VI i** T4 - Wf | !TE Table 7.1.3 VINYL CHLORIDE CARCINOGENICITY IN SPRAGUE-OAWLEY 4 RATS. PRELIMINARY RESULTS FROM MALTONI AND LEFEMINE Preliminary Results After 131 Weeks Exposure: 4 hours/day, 5 days/week Over a Twelve-Month Period * (iroii|B( and tiratmeht \miilitbt SjM'Uglll* lViwU-\ iats) Survi Tui al vor* \hima)s with tumours Z\mlal gland* WpInoMa*rai rinmicL-H* 1o|||;|X* No. No. ,\ii;;Hw;ii<i.ma!- OtlM*rt\| and,of To- l.ivei* t Hln*r nitt* Nile till No. No. No. NV- I VA `JTitW ppm no a VO 10,1X10 |>|I||| 0M 1:1 3 0 5* 27 111 vcr OMNI ppm 72 5 3 ue l` 21 IV VO '-`.'>00 ppm 74 . 2 0 ft :v I# 21 V VO Ann ppm 07 VI VO 2A0 ppm 07 i 3 3 7 V 1* IS *1 2 2# 2* 11 VII vo ;>o ppi/ 04 - \ ill N<* tiealm-tit OK i -- Total A77 A 23 20 39 K 10 00 " MHaMa.M* I*, limn. * .Mf'ljpfa*** to liver Jitiil #r to long and * Met aid aM* to lung. 4 \hgi*afrutiia in aulH'UtaneniiN film wing angioma. * Two inlrii-ftlNlttmtiinl tiiigioMiriitiims (1 nmliguoib* to *|)lt<eh ami I to ovary); 1 uM-ifying angio- vii iiHUA of n*rk, f Oik* pulmonary nitgntoirenma; 1 angHwarnmiA of titerti*. * One mtrn-alHlnmiiinl angioMtiruuiia (near to .<tpU*fti); 1 intrnlliorarir unifying anginsaniimiL `Two Z\ml>;d gland adrimman; I neurilemmoma of tin* ear; 1 mammary canitioum; I <ysto- udehoeaniiionia of uvAry, * Sdwmm* gland eareitininn of ?>km. * Zymlml gland adenoma, * Minimal deviation hepatoma. M)ne ZmhIiuI gland adenoma; 1 salivary gland rareiiioma. Total No. of tumour*. *7 li ucc 011748 Figure 7.1.1 DRAFT DO NOT QUOTE OR CITE The Concentration Deoendency of Selected Neoplasia In Sprague-Dawley Rats.a 40 -- - 3* ------ -- -* _LL 1 i i. i PERCENT TUMOR INCIDENCE er o f tumor bearing anlma 1 number o f animals In ea sure group) U\ 't & . . - u K4e5+iaooJj o<axU. ---- 1 -- ~r I ; fi- cr i i\L ^ --- -- - - -- ... - -- i I i j ! 1 -- -- i, 9 1 i 1 11 1 i -- I- - - -7 -- --* - -- - - --- r- (Q_ - -. - -- -- - L | ni |A +i 1 J.J1 _ .(Q i--r "T U# M ;l- l ~r l*/i j i s 2U ' i ft- t. y \ 11 4~r |.'7_U _l\ -j-S 'T ! H - i i -i :i i 1i * r n* '^1" ~r 1 * i 1m A 0 i--il --T _L i 0-- - -- ---- ----- - r\ \ m-.i i i 1 NET? Ij :C XM - | JJ_L ' \ | r\rr ( * - 1 i tX <o 1 8 q i -- i \ 10 Log-Concentration 4 a Derived from Maltoni C. and Lefemlne, G., 1974. The Incidence of neoplasia determined at 131 weeks following the onset of exposure. Animals were exposed to various concentrations of vinyl chloride for 4 hours per day, 5 days per week over a 52 week period. Control animals were void of tumors. 6 ucc 011749 / 't v l. all of the tumors observed under reduced exposure conditions were carcinomas of the Zymbal gland. There were no angiosarcomas or nephroblastoma in the liver and kidneys observed under reduced durations y of exposure to high levels of vinyl chloride. However, information is available only at the higher'exposure levels of vinyl chloride (10,000 and 6,000 ppm). There have been five distinct types of tumors observed in the investigations of Maltoni and Lefemine. 4 Angiosarcoma, narti- cularly In the liver of mice and rats were found. This tumor type was also observed in the subcutaneous tissue of offspring from vinyl chloride exposed pregnane rats. Zymbal gland carcinomas and.renal nephroblastomas in rats as well as mammary carcinomas in mice as a consequence of metastases from pulmonary adenomas were also observed. It is important to note that Zymbal gland carcinomas, nephroblastomas and liver angiosarcoma were never observed to occur spontaneously in the 4 strain of Sprague-Dawley rats used In these studies. Selected early conclusions reported by Maltoni and Lefemine from their preliminary studies are as follows; (note that parenthetical material has been added for clarity.): "Vinyl chloride is oncogenic (carcinogenic) under the experimental conditions employed. It induces, in rats, carcinomas of the Zymbal glands (sebaceous glands of^e skin located in the ear), nephroblastomas ( kidneys) and angiosarcomas in the.liver and other sites; in mice, liver angiosarcomas, pulmonary adenomas (in the lungs) and mammary carcinomas ( breast)." ? uec 011750 *"A direct relationship exists between dose (concentration) and length of treatment (exposure duration) and the neoplastic response (carcinogenicity)." *"Blood vessel ectasis and endothelial hyperplasia, associated or not with-cellular atypia, are often observed in the liver and in other organs and tissues in treated animals, with or without angiosarcomas. Therefore, the effect of vinyl chloride on blood vessels and endothel lal should be considered systemic." The American investigation ' began after the onset of the European studies and were designed to compliment the work of Maltoni and Lefemine. * While the experimental design differs to some extent from those of Maltoni and Lefemine, the early results'from investigations conducted by Kepllnger et al, 5 confirm the capacity of vinyl chloride to Induce hepatic angiosarcoma in mice at an exposure level of 50 ppm. Angiosarcoma was also identified in the liver of male rats *r and hamsters exposed to 2500 ppm and one female rat exposed to 200 ppm.J Further more tumors at other sites of the body were also observed in mice and include those identified in lungs, mammary glands and skin. There fore, additional evidence of multifocal carcinogenicity of vinyl chloride is consistent with that of Viola et al. 2 and Maltoni and Lefemine. 4 It is Important to note the appearance of liver angiosarcoma in a third species of experimental animals exposed to gaseous vinyl chloride; the Golden Syrian hamster. There have been no tumors observed in control animals at this time. Although there has been a high mortality rate among experimental animals in these studies, it is Important to note UCC 011751 / 00 W QuoU 0R cnt that angiosarcoma of the liver has been observed in mice exposed to 50 ppm of vinyl chloride following periods of exposure of only 6 months duration. This tends to confirm the observations of Maltoni and Lefemine in rats at this exposure level, an<t helps to clarify v sorog^questions raised regarding whether liver angiosarcoma occurs within the life span of experimental animals. In the Maltoni experiments, liver angiosarcoma was observed at 50 ppm only after 130 weeks of observation, suggesting that at dosages below 50 ppm, effects might not occur within the lifetime of rats. The American studies would suggest that,at least in mice, this is not so. The preliminary results from the American and European investigations provide convincing evidence that vinyl chloride Is an active chemical carcinogen. It has been shown to induce tumors in various organs in three species of animals at exposure concentrations down to 50 ppm. Angiosarcoma has also been observed in three species of animals; Sprague-Oawley rats, Syrian golden hamsters and mice. Angiosarcoma of the liver has also been observed in rats and mice in two research laboratories at 50 ppm exposure concentrations. It is noteworthy that Wlstar strain rats display a multiple carcinogenic response following inhalation of vinyl chloride with tumors appearing in several different organs (bone, kidneys and skin), but this strain af ra_ts is apparently refractory in the development - / of liver angiosarcoma. Furthermore, recent evidence suggests that the oncogenic response in the liver of experimental animals is not restricted to angiosarcoma since hepatomas have also been observed as well. 26 ucc 011752 DRAFT 00 NOT QUOTE OR CITE 45 While two laboratories'are investigating the dose-response relationships of vinyl chloride carcinogenicity, only the studies of Maltoni and Lefemine are sufficiently advanced to provide information in this regard*^However, the published data available are preliminary, largely qualitative in nature and of limited value for statistical analysis and risk assessments (Appendix A). Specific attention is drawn to the presentation of tumor incidence and the absence of data regarding the precise number of animals bearing more than one tumor type ( Tablet-3 ). Although total tumor incidence appears to be more dependent upon exposure concentration, this dependency is not readily apparent regarding liver angiosarcoma and is absent regarding nephroblastoma of the kidneys(Figure 7.1).Liver angiosarcoma and nephroblastoma appear to be more dependent upon exposure duration 4 than exposure concentration. It is important to recall the preliminary nature of the data available and the nature of carcinogenicity. Cancer is self replicating and largely irreversible depending upon the type and size of tumor development. Liver angiosarcoma in man is largely an incurable,fatal disease. Therefore, exposure tp vinyl chloride at any concentration for any period of time may not be without risk. Another important consideration from the early results of Maltoni and Lefemine is the possibility of transplacental carcinogenicity. Further attention is also drawn to the recent evidence of vinyl chloride mutagenicity thatreauires biotransformation (metabolic activation) by liver detoxification enzymes before effects are observed ucc 011753 / DRAFT Done: quote cr cite In bacterial test systems. While somatic mutations may provide a basis for carcinogenicity in the immediate generation, dominant germinal mutations could be express'ed-~as^an Increase in spontaneous abortions. In this regard, preliminary evidence suggests an elevated incidence of spontaneous abortions among the families of polyvinyl chloride workers.- These considerations underline the need to further evaluate the effects of vinyl chloride upon reproductive compentency including fertility, fecundity, and pre-peri-natal toxicology and transplacental carcinogenicity including possible transmission of this hazardous material from the workplace to the home. i -1 ucc 011754 / DRAFT EC f:'C7 QUOTE OR CITE 7.1.5 Absorption, Distribution, Metabolism, and Excretion In the review of aliphatic chlorinated hydrocarbons by von Oettingen, 11 levels of vinyl chloride were determined in the blood of cats subjected to acute exposure conditions, f^e^ppendix B also). Exposure to 100,000 ppm for less than 4 hours produced vinyl chloride concentrations of 15 to 17 mg percent ^ 'mg/100 mg blood) in these animals. Respiratory and cardiac arrest were observed as blood levels of vinyl chloride reached 27 to 30 mg per cent and exceeded 40 mg percent respectively. Approximately, 82 percent of the nhaled VC was eliminated immediately from the lungs in these experiments. 20 The observation of Viola et. al. in Wistar rats exposed to 10,000 ppm for 60 minutes tends to support conclusions regarding the lungs as the principle excretory route of vinyl chloride. The con centration of vinyl chloride decreases rapidly in expired air, blood, urine, brain, liver and kidneys during the first hour followiing exposure in those experiments. There was essentially no detectable levels of vinyl chloride in these animals at 3 hours following exposure. Analysis of the distribution of vinyl chloride among the formed elements and the fluid media of the blood indicates that red blood cells appeared to have a greater affinity for vinyl chloride than serum. Although these observations are limited in scope and detail, they provide qualitative evidence that vinyl chloride is absorbed, distributed throughout the body.and eliminated by the pulmonary and urinary excretory routes. It would appear from these early studies that vinyl chloride was not metabolized,was excreted essentially unchanged and tended to support conclusions regarding its low order of toxicity. UCO 011755 -t DRAFT DO KCT QUITE OR CITE However, with the evidence of the more recent studies on carcinogenicity, investigations regarding the metabolism and pharmacodynamics of vinyl chloride under controlled conditions have 2y,3U been undertaken by Hefner et-al^ Preliminary results of this investigation indicate that vinyl chloride monomer apparently metabolized to polar metabolites that are excreted primarily in the urine of animals subjected to an initial 50 ppm exposure level. There appears to be very little excreted in the expired air as unaltered vinyl chloride at this exposure concentration. The early conclusions drawn from these investigations by Hefner et al. are as follows: *There appears to be a metabolic threshold for metabolism of vinyl chloride. Spraque-Dawle.v rats exposed to vinyl chloride below 100 ppm appear to metabolize vinyl chloride fairly readily. Exposure to vinyl chloride levels in excess of 200 ppm reduces metabolism considerably. This also suggests that the metabolic pathway available at levels of vinyl chloride below 100 ppm can be saturated. UCC 011756 DRAFT D3 NOT QUOTE OR CITE *V1ny1 chloride appears to be metabolized via alcohol dehydrogenase since it can be inhibited by pyrazole (1,2 Dvrazole ethanol. It is important to note that the metabolism of vinyl chloride did not appear to be inhibited by SkF-525-A that is used to block the activity of some microsomal enzymes. Microsomal enzymes are important in steroid metabolism and detoxification of foreign chemical compounds (xenobiotics). While these are preliminary conclusions, it is important to recall the appearance of hepatic angiosarcoma in two species of experimental animals at 50 ppm exposure level (rats, mice) which would argue against a metabolic carcinogenic threshold at 50 ppm and higher exposure levels. The evidence presented in these studies suggests alternative metabolic pathways for vinyl chloride resulting in metabolites of perhaps differing toxicity. However, the saturation of the presumably safer pathway by ethenoJ,(and,conceivably bv other substances as well, i.e. drugs) argues that the "distinction" between pathways may not be well defined and that under certain conditions even relatively low exposures might be shunted through the more toxic pathway. Furthejfaore due to genetic variability, some individuals may i UCC 011757 rU'-i. f' I-- metabolize vinyl chloride predominantly through the more toxic pathways. In this regard, it would be premature to conclude, based upon current evidence, that an acceptable exposure to vinyl chloride can be defined in terms of alternative metabolic pathways. Vinyl chloride has been found to be excreted as --hydroxycysteine, suggesting metabolic transformation via an expoxide intermediate. The elimination of xenobiotics by the formation of epoxide, followed by conjugation with thiol containing compounds is found in the metabolism of a number of carcinogenic compounds, as will be discussed below. Since vinyl chloride has is a rather simple chemical structure with lirited capacity for metabolism by complex pathways, it appears to be a good model compound for use in studies on the mechanism of chemical carcinogenesis. P. L. Grover, P. Sims and their co-workers have tested a number of carcinogens for ^n vivo and |n vitro formation of epoxides, which have been shown to be alkylating agents of nucleic acids and proteins. They have presented evidence for formation of epoxides for a number of carcinogens including pyrene,3^ benzo[a]Dyrene ^ phenanthrene, 33 ben2[a]anthracene35 and dibenz[a,h]anthracene. Epoxides of polycyclic hydrocarbons have been shown to be mptagenic to T^ bacterioohage, to bacteria,-37 to Drosophila sp3. a and to mammalian cells. 39 They also produce malignant transformations of cells in culture. ^ ucc 011758 / DRAFT DO HOT QUOIE 03 CITE Another possible mechanism of cancer induction by chemicals is via decreased protection against the -deleterious effects of free radicals. Non-protein thiols are known to afford protection against free radicals. However, these thiol containing compounds can be reduced by the formation of mercapturic acid conjugates of epoxides from reaction with glutathione. Hefner et.al: also reported a decrease in serum non-protein thiol compounds after exposure of rats to vinyl chloride. This can be related to the dangers of multiple exposure to compounds related to vinyl chloride in the same manner as for the epoxide mechanism. Indeed, this mechanism is only a variation of the epoxide mechanism, however, in this case free radicals are the final cause of damage, whereas in the epoxide mechanism, reaction of epoxide with DNA or protein is the deleterious step. A large literature also deals with the formation of mercapturic acid derivatives of epoxides from reactions wicn giutatnione. a review of postulated mechanisms of carcinogenicity of vinyl chloride and structurally related compounds has been presented by van Duuren. a UCC 011759 drmt _c r QUOTE. CS Cut Du It would be Ideal to suppose that a screening procedure for car cinogenic chemicals could be developed on the basis of analysis of , tissue from experimentally exposed animals for epoxides or mercapturic acid derivatives. The concentration of these materials found at various exposure levels could theoretically be used as a risk index. However, discrepancies in the relationship of these derivatives to carcinogenesis preclude any such simplistic approach. The data herein alluded too does, however, Indicate that such an approach may be possible in the future if research pertinent to the basic mechanisms of chemical (41/2) carcinogenesis is supported. This research should optimistically result In answers that would allow evaluation of the carcinogenic hazard of a large number of existing environmental pollutants as well as analysis of new synthetic chemical compounds prior to their ubiquitous distribution in the environment. 7 ucc 011760 / 7.1.o Aaaitional Toxicological Concerns AT -* ^ are 7.1.6.1 Toxicity of Polyvinyl Chloride The free radical content and the level of residual vinyl chloride monomer of PVC resins and plastic end products could affect their toxicity including potential for carcinogenic activity. Volkeimer43 reported particles of polyvinyl chloride up to 70 microns in diameter transported and deposited throughout the tissues of experimental animals. The combination of these two observations along with the possibility for population exposure to polyvinyl chloride such as perhaps through erosion of PVC pipe and the wide use of flexible plastic materials containing leachable materials indicate the necessity for further study In this area. 7.1.6.2 Toxicity of Pyrolytic Products of PVC Another potential problem area related to vinyl chloride is the composition and toxicity of products produced by incineration of PVC. Again this is a potentially widespread opportunity for general population exposure to other hazardous materials. Disposal of PVC by incineration is a common practice, however, little data is available on the toxicology of pyrolytic products. i -1 - UCC 011761 7.2 THRESHOLD LIMIT VALUES Although occupational health studies began In 1930, there were essentially no reports of possible systemic effects or serious health adversities associated with polyvinyl chloride production and/or exposure to vinyl chloride monomer (VCM) until 1949. Chronic "epithelial" hepatitis was diagnosed in Russian resin fabricators (9) engaged in processing polyvinyl chloride resins. The possible etiological agents listed included primary ingredients used for polymerization, compounds released from the resin during processing and plastisizers. It is noteworthy that the possibility of potential health hazards from exposure to residual materials released from polymer resins was suggested more than twenty five years ago. In the absence of chronic investigations during this period, the low acute toxicity and the apparent lack of evidence of adverse health effects from previous occupational experience,a threshold limit value of 500 ppm (1300 mg/m ) time-weighted average was established in 1959 by the American conference of Governmental and Industrial Hygienists (ACGIH) as the industrial hygiene standard for vinyl chloride in the United States. The non governmental standard was apparently based solely upon fire and explosive hazards that are possible at a minimal level of nercent (?f,000 DDm) by weight of vinyl chloride in air. UCC 011762 DRAFT s: r::: quote or cite The results of acute toxicity studies, which wore the order of the day in the early years of vinyl chloride and polyvinyl chloride production, provided evidence of pulmonary congestion (edema) with damage noted in the liver, kidneys-and tracheal epithelium concomitent with narcotic effects "associated with high exposure levels of short duration. Advancements in toxicological protocols and the state-of-the-art of biomedical research along with the evidence of organ or damage and svsteric effects observed under acute exposure conditions led to tre chronic Jow level 1 inhalation studies of Torkelson. Oven and "owe in ig^l. *' Pased on observations in several species of experi mental ani'-als that included evidence of liver and kidney pathology at the f-resnold limit value ;50C ppr' and the absence of these effects at 50 rt" Vi low tug 6 r-ontns of investigation, these authors recommended the a cringe in industrial hygiene standard. Those recommendations made in 19cl succested limiting occupational vinyl chloride exposures to less tnan ICC opr with a tire-weighted average not to exceed 50 ppm in air of tne P'.C wgrkrocr environment. The subacjte studies of Lester, Greenberg and AdaiW 29ed the authors to conclusions that were essentially contradictory to those of Torkelson, C.er.ar- , despite increased liver weight and slight liver stooafolcd. observed in their experimental animals. On the oas-'s o" t'r5c arc ct^er observations at higher dosages i ste-'eo o.er s-:rter exoosure reriods, these authors recommended existiro 500 opr threshold limit value. UCC 011763 w- iV . ;.j : c ' ' rfTp The Committee on the Threshold Limit Values of'the"American Conference of Governmental and Industrial Hygienists (ACGIH) considered the evidence presented In these two conflicting reports and chose to change the industrial hygiene standard for vinyl chloride from a 500 / - (TWA) yppm maximum time-weighted average/value to a 500 ppm celling level for Industrial exposure. Along with growth and expansion In production and use of polyvinyl chloride resins* the workforce ^is industry increased accordingly. In time a unique occupational health problem appeared Involving those workers engaged In cleaning polymer reactor vessels. Vinyl chloride disease or acroosteolysis was first reported In g 1966. ` This disease involved a progressive skeletal deterioration of the fingers accompanied by Interference In peripheral nerve response and diminished blood circulation (Raynaud - like syndrome). While other reports have appeared in subsequent years, occupational acroosteolysis In PVC reactor cleaners has been well documented by large scale epidemiological studies conducted between 1969 and 1972. * Since this adversity was apparently restricted to those Individuals exposed to exceptionally high levels of gaseous vinyl chloride and the response with PVC resins associated more with direct dermal contacts It appeared that the processing of PVC resins did not Involve a health hazard of sufficient severity to warrant adjustment of the Industrial hygiene standard. Furthermore, available standard textbooks and review articles have stressed the of safety / polymer processing and noted only a minimal risk of narcosis associated with inhalation of vinyl chloride vapors. 47-50 4 ucc 011764 DRAFT 00 NOT QUOTE GR CITE Important studies regarding occupational exposure to vinyl chloride that were Influential In adjusting permissible exposure levels were those of 44 and Kramer and Mutchler*. Baretta, Steward and Mutchler46 These Investigations Involved determining levels of vinyl chloride In the air of the work area and correlating them with results of a systematic multiphasic screening of employees using a variety of clinical parameters. The mean concentration of vinyl chloride In the work-place air In these studies was found to be 160 ppm with a range of 30 to 170 ppm. Vinylldlne chloride was noted as a co-contaminant at a level of 5 ppm. While no difference was observed In blood pressure, hemoglobin levels, electrocardio grams nor was there evidence of morphological anomalies (acroosteolysls), there was adequate Indication of some7 degree of liver damage among PVC employees at TWA exposures of 300 ppm. These observations led the investigator to conclude that there was a definite risk of liver damage at vinyl chloride levels of 300 ppm time-weighted average (in the presence of 5 ppm of vinylldlne chloride).4j4 *>-*- ucc 011765 / draft quote or cite The second adjustment of the industrial hygiene standard to a TWA . of 200 ppm was apparently Influenced by evidence of human liver dysfunction and the availability of monitotn9jteta regarding levels of vinyl chloride in air of at least one PVC production facility. 44,46 Although Torkelson et al. had reported slight liver damage in experimental animals exposed to 200 ppm of vinyl chloride in 1961, 13< these observations were apparently not fully considered until a decade later. Oue to the increasing incidence and concern regarding acroosteolysis, experimental studies had been undertaken to develop an animal model for elucidating the pathogenesis of this and other adverse effects observed in humans exposed to high levels of vinyl chloride by Viola 2 20 ^ et al. in 1970 and 1971. * In the course of these acute studies carcinoaenic effects were observed and 7-2 -S ucc 011766 DRAFT DO NOT QUOTE OR CITE presented in 1970 with a later full detailed publication of the observations in 1971. Although deficiencies In experimental design were noted with regard to those suitable for cardnogen1c investigations, there was sufficient evidence presented that warranted further study. Subsequent Investigations were Initiated In Europe and in the United States using 4,5 lower exposure levels and purer compounds. Preliminary results from these efforts confirmed the carcinogenicity of vinyl chloride in several species of experimental animals, a dose-response dependency of tumor Incidence was observed, and positive effects detected at exposure levels down to 250 ppm. 3 * 4 While carcinogenic effects of vinyl chloride were noted at dosages close to permissible Industrial exposure levels (TLV: 200 ppm), there was equal concern regarding the type of tumors Identified and not observed 2 at hlqher exposure levels In the earlier studies of Viola et al. in Due Due to the history of liver dysfunction in PVC employees and in chronic experimental animals observed earlier particular concern was 3,4 aroused by the appearance of liver angiosarcoma In experimental animals- Increasing Interest In vinyl chloride followed the findings that 4 employees at this a.PVC plant had died of either liver angiosarcoma, a rare form of human liver cancer, or other liver cancers of unknown types from 1968 to 1973 A fifth Individual died in late 1973 of cirrhosis of ni ucc 011767 the livejr'. Investigation of the exposure history of these individuals revealed that the deceased employees had an average exposure of 19 years to vinyl chloride and ten years to vinylidene chloride. These workers had been engaged in operations where vinyl chloride concentrations may have greatly exceeded the 1972 Threshold Limit Value (200 ppm). In view of these considerations and results from on-going toxicological studies, government officials pursuant to the statuatorv reouirements nf t^e .cupational safety and haalth legislation of 1970 promulgated an emergency standard for industrial exposure at 50 ppm in early 1974 as efforts to determine the bl scope of the occupational problem were accelerated. Results of the American and European toxicology studies soon revealed the induction of liver angiosarcoma and other tumors at a 50 ppm exposure level of vinyl chloride.3" Industrial epidemiological investigations identified additional cases of liver angiosarcoma among American and European PVC workers. An occupational standard of 1.0 ppm (or detectable levels) was then proposed by the Occupational Safety and Health Agency, U. S. Department of Labor as an industrial exposure standard C? for vinyl chloride in American industrial facilities. Subsequently, a permanent 1 ppm time-weighted average occupational standard (8 hours per day; 5 days per week) with a peak 5 minute excursion not to exceed 5 ppm has been promulgated. Angiosarcoma of the liver is an extremely rare tumor in the general population of the United States. The incidence of angiosarcoma among employees involved in the manufacture of monomeric vinvl rhlnn'He and polyvinyl chloride resins substantially exceeds the estimated national incidence level. During the course of retrospective analysis of various tumor registries, several community cases of liver angiosarcoma were discovered. Although the general public has been exDose' -1 ucc 011768 DRAFT DO HOT QUOTE OR CITE to vinyl chloride thorugh other exposure routes (e.g. aerosol sprays), particular concern has been expressed regarding community cases of liver angiosarcoma among those with residence situated near VC/PVC production plants and resin fabricating facilities. Questions have been raised regarding exposure of the more than 700,000 workers employed in fabricating PVC resins containing residual monomeric vinyl chloride as well as the degree of conmunity exposure surrounding these plants. It is noteworthy that the first reported occupational health problems associated with polymer processing involved workers engaged (ol in fabricating resins into plastic products. ' Vinyl chloride has been detected in the ambient air near vinyl chloride and polyvinyl chloride production sites. The appearance of liver angiosarcoma in experimental animals serves to underscore the predict^ value of well designed and executed ioxicological studies in identifying potential health hazards to man. While it is always a curiosity to ponder speculations on a retrospective basis, had adequate studies been performed at an earlier date, the problems exposure associated with vinyl chloride/may well have been identified before human cases of liver angiosarcoma among PVC workers had occurred. ucc 011769 REFERENCES DRAFT 00 NOT QUOTE OR CITE 1. Dinman, B.D., W.A. Cook, W.M. Whitehouse, H.J. Magnuson, and Th. Ditcheck. Occupational Acroosteolysls I. An Epidemiological Study. Arch. Environ. Hlth. 22:61* 1971. 2. Viola, P.L., A. Bigottl, and A. Caputo. Oncogenic Response of Rat Skin, Lungs and Bones to Vinyl Chloride. Cancer. Res. 31^:516-522, 1971. 3. Mai torn', C. Occupational Carcinogenesis, in: Proceedings of the Second International Symposium on Cancer Detecter and Prevention, International Congress Series No. 322. Excerpta Medica, Amsterdam (ISBN 9021902281) April 9-12, 1973. 4. Maltonl, C. and G. Lefemlne. Carcinogenicity Bioassays of Vinyl Chloride. I. Research Plan and Early Results. Environ. Res. 7:387-405, 1974. 5. Keplinger, M.L., J.W. Goode, O.E. Gordon, and J.C. Calendra. Experimental Studies with Vinyl Chloride, (presented to the Working Group in the Toxicity of Vinyl Chloride-Polyvinyl Chloride, New York Academy of Sciences, May 10-11, 1974). 6. Creech, J.L., Jr. and M.N. Johnson. Angiosarcoma of the Liver in the Manufacture of Polyvinyl Chloride. J. Occup. Med. 16^150-151, 1974. 7. Tabershaw, I.R. and W.R. Gaffey. Mortality Study of Workers in the Manufacture of Vinyl Chlordle and its Polymas. J. Occup. Med. ^6:509-516, 1974. 8. Van Duuren, D.L. On the Possible Mechanism of Carcinogenic Action of Vinyl Chloride, (presented to the Working Group on the Toxicity of Vinyl Chloride - Polyvinyl Chloride, New York Academy of Sciences, New York, N.Y., May 10-11, 1974). l-` ! ucc 011770 Dn/i pt UM/.f- J lr/wi I III I fV-'lTi' 'rr(*i 8a. Irish, O.D. Halogenated Hydrocarbons: I Allpratic. In: industrial Hygiene and Toxicology, Patty, F.A. (ed.), Interscience Publishers, John Wiley and Sons, New York, N.Y. 4 edition, Vol. II, p. 1241-1332. ' 19*7. 9* Marsteller, H.J., W.K. lelbach, R. Muller, and P. Gedigk. Unusual Splenomegalic Liver Disease as Evidenced by Peritoneosocpy and Guided Liver biopsy Among Polyvinyl Chloride Production Workers, (presented to the Working Group on the Toxicity of Vinyl Chloride- . Polyvinyl Chloride, Mew York Academy of Sciences, New York, N.Y., May 10-11, 1974). 10. Mastromatteo, E., A.M. Fisher, H. Christie and H. Danziger. Acute Inhalation Toxicity of Vinyl Chloride to Laboratory Animals. J. Amer. Indust. Hyg. Assoc. 21^:394-397, 1960. 11 Von Oettingen, W.F. The Halogenated Hydrocarbons, their Toxicity and Potential Dangers. Public Health Service Publication, No. 414, U.S. Department of Health, Education and Welfare, U.S. Government Printing Office, Washington, D.C., 1955. 12. Lester, D., L.A. Greenberg, and W.R. Adams. Effects of Single and Repeated Exposures of Humans and Rats to Vinyl Chloride. Am. Ind. Hyg. Assoc. J. 24:265-275, 1963. 7- : UCC 011771 / DRAFT DO NOT QUOTE OR CITE Torkelson, T.R., F. Oyen, and V.K. Rowe. The Toxicity of Vinyl Chloride as Determined by Repeated Exposure to Laboratory Animals. Am. Ind. Hyg. J. 22:354-361, 1961. 14. Cornish, H.H. Problems Posed^by Observations of Serum Enzymes Changes In Toxicology. CRC. Crlt. Rev. Toxicol. l_:l-32, 1971. 15. Grice, H.C. M.L. Barth, H.H. Cornish, G.V. Foster, and R.H. Gray. Correlation Between Serum Enzymes, Isoenzymes Patterns and Histologic cally Detectable Organ Damage. Food Cosmet. Toxicol. 9:847-885, 1971. 16. Grice, H.C. The Changing Role of Pathology in Modern Safety Evaluation. CRC Crlt. Rev. Toxicol. T_: 119-1529 1972. 17. Williams, D.J. and B.R. Rabin. Disruption by Carcinogen of the Harmone Dependent Association of Membrances with Polysomes. Nature, 232:102-105, 1971. 18. Roobol, A. and B.R. Rabin. The Binding of Polysomes to Smooth Membranes of Rat Liver by Steroid Hormones and Extracts from Either Rough Endoplasmic Reticulum or from Polysomes of the Opposite Sex. F.E.B.S. Letters, 14:165-169, 1971. 19. Pitot, H.C. Endoplasmic Reticulum and Phenotypic Variability in Normal and Neoplastic Liver. Arch. Pathol. 87:212-222, 1969. 20* Viola, P.L. Pathology of Vinyl Chloride. Sixteenth International Congress of Occupational Health, Tokyo, Japan, Abstr. No. 38, 1969. 21. Viola, P.L. Carcinogenic Effect of Vinyl Chloride. The Tenth International Cancer Congress, Houston, Texas, Abstr. Vol 29, 1970. q. 2 - ! ucc 011772 ' "'R CITE 22. Popper, H. Alterations of Liver and Spleen Among Workers Exposed to Vinyl Chloride (presented to the Working Group on the Toxicity of Vinyl Chloride - Polyvinyl Chloride, New York Academy of Sciences, New York, N.Y., May 10-11, 1974. 23. Rad, K.$. and R.D. RecknageY:'Early Onset of Lipoperoxidation in Rat Liver after Carbon Tetrachloride Administration. Exptl. Mol. Pathol. 9:271-278, 1968. M. Bendettl, A., M. Ferrall, E. Chiell, and M. Comparti. .A Study of the Relationship Between Carbon Tetrachloride Induced Lipid Peroxidation and Liver Damage in Rats Pretreated with Vitamin E. Chem. Biol. Interaction. 9:117-134, 1974. *S. \Munson, R.R., J.M. Peters, and M.N. Johnson. Proportional Mortality \ Among Vinyl Chloride Workers. Lancet, 397-398, 1974. 2fi. Maltoni, C. A Comnunlcation sent to the Proceedings on the Proposed Permanent Standards for Occupational Exposure to Vinyl Chloride. Occupational Safety and Health Administration, U.S. Department of Labor, Washington, D.C., June 25, 1974. ,, Rawing, V. Johansson. K. Ramel. and'V. Wachtmeister. Mutagenicity of vinvl Chloride after Metabolic Activation. Ambio, 1974, (in press). I - * ucc 011773 28. Sellkoff, I. J. 45RAET 00 NOT QUOTE OR CITE Personal Communication, Mount Sinai School of Medicine at the City University of New York. Testimony before the Sub-Committee on the Environment of the U. S. Senate commerce / Committee, August 21, 1974. Hefner, R.E., Jr., P.6. Watanabe, and P.J. Gering. Preliminary Studies of the Fate of Inhaled Vinyl chloride Monomer (VCM) in Rats (presented by P.J. Gering to the Working Group on the Toxicity of Vinyl Chloride-Polyvinyl chloride. New York Academy of Sciences, New York, N.Y., May 10-11, 1974.). 3(T. Gering, P.J. Toxicology Research Laboratory, Health and Environmental Research, Dow Chemical Co., Midland, Mich. Personal Comnunication, 1974. Grover, P.L. and P. Sims. Interactions of the K-Region Epoxides of Phenanthrene and Dlbenz J.a,h] Anthracene with Nucleic Acid and Histone, Biochem, Pharmacol. 19.: 2251-2259, 1970. 32. Grover, P.L. and P. Sims. Enzyme-Catalysed Reactions of Polycyclic Hydrocarbons and Deoxyribonucleic Acid and Proteins In Vitro. Biochem J. 1T0j_ 159-160, November 1968. 33., Grover, P.L., J.A. Forrester, and P. Sims. Reactivity of the K-Region Epoxides of Some Polycyclic Hydrocarbons Towards the Nucleic Acids and Proteins of BHK 21 Cells. Biochem. Pharmacol. 20:1297-1302, June 1971. 34. Kurokl, T., E. Huberman, H. Marquardt, J.K. Sleklrk, C. Heldelberger, P.L. Grover, and P. Sims. Binding of K-Region Epoxides and Other Deri vatives of Benz [aj Anthracene and Diznez [a,h] Anthracene to DNA, RNA, and Proteins of Transformable Cells. Chem. - Biol. Interactions 4:389-397, 1971/1972. 7- 7 '/3 ucc 011774 Pf?,*FT DO iV'T r.rr / *. `I-..|7 C- ITE 35. Grover, P.L., A. Herver, and P. Sims. Formation of K-Reglon Epoxides as Microsomal Metabolites of Pyrene and Benzo [a] Pyrene. Biochem. Pharmacol. 21:2713-2726, November 1972. 36. Grover, P.L., A Herver, and P. Sims: Epoxides as Microsomal Metabolites of Polycyclic Hydrocarbons. *FEBS Letters 8:76-80, January 1971. 37. Cookson, M.J., P. Sims, and P.L. Grover. Mutagenicity of Epoxides of Polycyclic Hydrocarbons Correlated with Carcinogenicity of Parent Hydrocarbons. Nature, N.B. 234:186-187, December 8, 1971. 38. Ames, B.N., P. Sims, and P.L. Grover. Epoxides of Carcinogenic Polycyclic Hydrocarbons are Framshift Mutagens. Science 176:47-49, April 7, 1972. 39- Fahmy, O.G. and M.J. Fahmy. Genetic Properties of Substituted Derivatives of NqMethyl-4-Aminoazobenzene in Relation to Azo-dye Carcinogenesis, Int. J. Cancer.10:194-206. July 1972. 40. Huberman, E., L. Asplras, C. Heidelberger, P.L. Grover, and P. Sims. Mutagenicity of Mammalian Cells of Epoxides and Other Derivatives of Polycyclic Hydrocarbons. Proc. Natl. Acad. Sci. 68:3195-3199, December 1971. 41. Von Duuren, B.L. Carcinogenic Epoxides, Lactones and Halo-ethers and Their Mode of Action in: Biological Effects of Alkylating Agents. Ann. New York Acad. Sci. 163:633-651, 1969. 42. Stoltz, D.R., L.A. Poirier, C.C. Irving, H.F. Stich, J.H. Weisburger and H.C. Grice. Evaluation of Short-term tests for Carcinogenicity. Tox. Applied Pharm. 29:157-180, 1974. 43. Volkheimer, G. Hematogeneous Dissemination of Ingested PVC Micro particles, (presented to the Working Group on the Toxicity of Vinyl Chloride - Polyvinyl Chloride, the New York Academy of Sciences, New York, N.Y., May 10-11, 1974). 7-7-/V UCC 011775 / Kramer, C.G. and J.E. Mutchler. The Correlation of Cl * rri cal and Environmental Measurements for Workers Exposed to Vinyl Chloride. Am. Ind. Hyg. Assoc. J. 33*19, 1972. -Threshold Limit Values for Chemical Substances and Physical Agents in the Workroom Environment with Intended Changes for 1972. America Conference of Governmenta'T^and Industrial Hygienists, 1972. Baretta, E.D., R.D. Stewardt, and J.E. Mutchler. Monitoring Exposures to Vinyl Chloride Vapor: Breath Analysis and Continuous Air Sampling. Am. Ind. Hyg. Assoc. J. 30_t537 1964. Wilson, R.H and W.E. McCormick. Plastics, the Toxicity of Snythetic Resins. A.M.A, Idrst. Health. 21_:536, 1960. Zapp, J.A., Jr. Toxic and Health Effects of Plastic and Resins. Arch. Environ. Health. 4:125, 1962. Malten, K.E. and Zlelhuis. Industrial Toxicology and Dermatology in the Production and Processing of Plastics. Elsevier Publishing Co., New York, N.Y., 1964. International Labour Office; Encyclopedia of Occupational Health and Safety. Vol. II, p- 1467, 1922, Geneva, Swtiz. Emergency Temporary Standard for Occupational Exposure to Vinyl Chloride. Occupational Safety and Health Administration, U.S. Department of Labor, Fed. Reg. 39. 12342, April 5, 1974. Proposed Standard: Vinyl Chloride. Occupational Satety and Health Administration, U.S. Department of Labor. Federal Reg. 39. 16896, May 10, 1974. I ICC 011776 7.3 HUMAN EFFECTS n ".*\.*-rr*?r co i;ot quote or csr,- To date most of our knowledge of undesirable effects associated with vinyl chloride exposure in man comes from occupational situations. These effects include an increased risk of`cancer at multiple organ sites includ ing anqiosarcnnwof the liver, an almost invariably fatal form of liver cancer. Liver angiosarcoma is extremely rare among the general population, but has been observed among workers with exposure to vinyl chloride. It is recognized that angiosarcoma observed today in workers exposed to vinyl chloride was generally, though not exclusively, the result of very high occupational exposures received many yeara ago. The latent period for angiosarcoma of the liver has been estimated at between 15-20 years following onset of exposure although 12 Individual cases may occur after shorter or longer latent periods. ' This long latent period suggests that the full impact from past vinyl chloride exposure among workers may not be realized until many years from now since the greatest number of workers have had onset of exposure in the last decade. For example, of the 25 known occupationally reported cases of live angiosarcoma, information as to date of diagnosis or death, where available, indicates that only 2 of 22 cases died prior to 1965 and that 14 of 22 cases had died or were diagnosed in 1970 or later. Accordingly estimates of cancer risk from vinyl chloride based upon data available today may well understate the magnitude of this problem. In this regard, increased awareness and improved diagnostic procedures may in part also contribute to future increases in reported cases of liver angiosarcoma. To date surveys have uncovered 15 cases of occupationally reported liver angiosarcoma in this country.2 Of these cases. 14 have been among workers in PVC polymerization plants and one case involved an accountant employed at V; / ucc 011777 / a vinyl cloth plant. DRAFT DO NUT U'JOTF. CR CITE At least 13 of these cases have been comflrmed as angiosarcoma of the liver by pathologists at the National Cancer Institute.3 In addition to these 15 U.S. cases, 10 occupational cases of liver angiosarcoma have been reported from European countries, 7 among workers in the PVC polymerization industry amT^among non-polymerization workers. A summary of these reported occupational liver angiosarcoma cases is shown in Tables 7.3.1 and 7.3.2. As indicated In these tables, the latent period from onset of initial exposure to age at diagnosis or death in all known instances is 10 years or greater. Similarly the years of exposure among these individuals preceding development of clinical disease Is with one exception also in excess of 10 years. This one exception may, however, be Important and involves a case In which there was an established occupational exposure history of only 4 years' duration. This case suggests that disease may, in certain instances, develop after relatively brief durations of occupational exposure to vinyl chloride or, alternatively, that other factors besides vinyl chloride may have been Involved. These cases represent all currently known occupationally reported liver angiosarcomas* A reported case of liver angiosarcoma in an employee at an electrical insulation plant in Connecticut upon re-examination by pathologists at the National Cancer Institute, was not considered to be liver angiosarcoma. 4 * 5 * 6 With respect to the general population, at one time there were believed to be 3 reported cases of liver angiosarcoma among individuals who had resided in the vicinity of industrial vinyl chloride emission sources. A review of these cases by pathologists at the National Cancer Institute has confirmed the diagnosis of liver angiosarcoma in two of the three instances. One 7J 2- - ucc 011778 DO NOT QUCTt OR Cl It Table 7.3.1 LIVER ANGIOSARCOMA CASES AMONG VC POLYMERIZATION WORKERS2 Case No. Country Date oC_ Years after Death First Exposure 1 West Germany 1969 11 2 United States Alive 12 3 United States 1971 14 4 West Germany 1971 14 5 United States 1968 15 . 6 United States 1961 15 7 United States 1968 17 8 United States 1969 18 9 Sweden 1970 19 10 United States 1969 20 11 United States 1964 20 12 United States 1973 22 13 Norway 1972 22 14 United States 1970 23 15 United States 1968 24 16 United Kingdom 1972 26 17 United States 1973 28 18 United States Alive 29 19 United States 1974 30 20 Czechoslovakia Awaiting Details 21 Czechoslovakia Awaiting Details Years of Exposure 11 12 13 14 15 15 17 4 18 15 18 16 21 23 18 20 28 17 30 Age at Diaqnosi: 39 45 37 40 44 41 54 41 43 50 52 51 56 60 45 71 59 43 52 7J -3- ucc 011779 Table 7.3.2 DRAFT CO ' (J'J'jTC OR CITE LIVER ANGIOSARCOMA CASES AMONG NON-VC POLYMERIZATION WORKERS2 Country Date of Years after Death First Exposure United States 1973 -- West Germany 14 United Kingdom 1970 Sweden 1972 24 27 Years of Exposure -- 11 23 . Age at Diagnosis Notes 47 Accountant at vinyl cloth plant 43 Filled pesti cide cans with VC propellant 55 Vinyl cloth plant 61 VC monomer production plant 7 3 -4- UCC 011780 / case of a woman in Buffalo, New York that was originally believed to be liver angiosarcoma 7 has now been redlagnosed as an anaplastic carcinoma rather than a sarcoma. The two other cases.^rom Connecticut, represent gQQ confirmed angiosarcomas * ' but these cases are not identical in all respects to the pathology which has been observed among PVC polymerization workers. 3 * 9 ' 10 The implications of-these dissimilarities between community and occupational cases are not fully understood. Angiosarcomas of the liver resulting at lower exposure doses may not be charac terized by all the pathologic findings seen in the PVC workers who in general were exposed to high doses of vinyl chloride. On the other hand, the possibility must also be considered that these two Connecticut community cases were un related to vinyl chloride exposures. The fact that Connecticut has one of the finest tumor registries in this country may be important since other states with less adequate followup procedures would not be able to readily identify suspect community cases of liver angiosarcoma. Further the clustering of these 2 community cases and the above mentioned accountant around VCM emission sources in Connecticut raises the possibility of a causal relationship. ut these community cases, one was a 73-year old man who had lived his entire life within 2 miles of an electrical products factory which pro cessed electrical insulation made of PVC. The other was an 83-year old woman, a housewife and retired cook, who resided for 35 years within h mile of the vinyl products plant at which the above-mentioned accountant was employed.^ It should also be noted that both community cases lived in excess of 70 years. In contrast, over half of the 25 reported occupational cases mostly at high levels were of exposure/either diagnosed or had died at ages 50 years or younger and only one case lived in excess of 70 years. These community cases may reflect an increase in 9 latent period at low levels of exposure as has been suggested in animals studies. As a result of the reported cases of liver angiosarcoma among vinyl chloride workers, a number of studies have been conducted examining the mortality experience of these workers and contrasting this experience with that observed in the general population. UCC 011781 / Tabershaw/Cooper Associates conducted a mortality study of workers In the vinyl chloride industry.^*11 objectives of this study were threefold: (1) To contrast the mortality experience of individuals employed in vinyl chloride plants with that of the general population; (2) To examine mortality patterns among vinyl chloride workers in relation to estimated occupational exposure; and (3) To compare mortality patterns among vinyl chloride workers with those for otner occupational groups. The study population was composed of 8,384 individuals from 33 domestic plants with at least one year of occupational exposure to vinyl chloride.including retired and terminated as well as currently employed workers. The vital status of these workers was ascertained as of December 31, 1972 and cause of death was determined based upon available death certificates. Observed mortality was then compared to expected mortality based upon the United States male population accounting for age and time of death and Standardized Mortality Ratios were computed for total mortality and specific causes of death. Exposure categories were defined subjectively by industrial hygiene and safety personnel at each plant who identified those jobs and work lcoations with the highest exposures to vinyl chloride and classified other job categories as medium or low relative to those jobs with the greatest exposures. This procedure was reasonable for estimating relative exposure within a given plant but could not assure comparable exposure categories across all plants or over time since a low exposure in past years might be numerically equivalent to a relatively high exposure in recent years. An exposure index was calculated for each worker as a time weighted average 7, l -6- ucc 011782 / Ln J WOT v'-w on CITE of exposure categories over the period of employment allowing an overall low and a high exposure category to be defined. Followup procedures were adequate to define the vital status for 85% of the study population as of December 31, 1372. Among the 352 workers known to have died, death certificates were obtained for 328 workers. The mortality calculations considered only those workers who had been success fully traced which assumes that the mortality experience of these workers was equivalent to those who were not successfully traced. The median birth year for those successfully traced was 1931 compared to 1920 for those not traced. The median year in which exposure began was 1962 among those successfully traced compared to 1953 among those not traced. The median duration of employment for those successfully followed was 80 months in contrast to 44 months for those who were not traced. Thus, while those successfully traced had about twice the duration of employment as those not traced, those who were not traced began their employment about 10 years prior to those for whom followup was complete. Accordingly, the mortality experience among those not traced might have been different from that in the study population considering the increased latent period since onset of exposure in this group. More than half (about 60%) of the study popu lation entered employment in 1960 or later indicating that the majority of workers in this study were not followed for an adequate length of time after exposure began to assure observation of all potential Iona term efferte. Included among the 7,128 workers successfully traced, however, were 854 workers with 20 or more years' exposure and 1,640 workers with exposures of 15 years or greater. The discovery of 1,500 workers with exposures *1 l -7- UCC 011783 1 i v * r 1 i: -U. on CITE occurring up to 35 years ago -- too late to be included in the study group-should also be noted since these workers would have provided Information as to the effect of very long exposure-end long latency upon mortality, areas in which the present study was relatively weak. The effects of exposure index (low vs high) and duration of exposure (less than or greater than 5 years) upon mortality as well as interaction effects between level and duration of exposure were examined. Based upon these calculations, the following observations were made: -- Compared to the general male U.S. population the overall mortality of the study population was approximately 752 of what would have been expected. This favorable overall mortality frequently occurs in occupational groups even if an industrial hazard increases the risk of death from a particular cause, since occupatonal groups are usually younger, and healthier than the average general population. -- No specific cause of death was increased to a statistically significant extent above what would have been expected in a comparable U.S. male population. . -- SMR*s (Standardized Mortality Ratios) for malinnant neonlasms as a whole increased _ _ . iU with Increasing exposure, measured by level, duration or Doth. For example, 36 malignancies were observed in the high exposure group with 5 years or more exposure compared to 26.11 expected cases. Among those with greatest exposure, cancers of the liver (primarily angiosarcoma), respiratory 7-2 -8- uoc 011784 DO NOT OV''-:f.*V. i OR CITE system, brain, cancers of unknown primary site and lymphosarcoma occurred more frequently than expected. Though these findings were not statistically significant, the authors of the Tabershaw-Cuuper stuuy cunsiuereti these findings suggestive of a relationship between exposure to vinyl chloride and increased cancer risk at multiple sites, since the number of deaths for many cancer causes in ihis study is quite small. Accordingly, even relatively high SMR's may not be statistically significant. The results of a long-term mortality study of 594 chemical workers exposed to vinyl chloride between the years 1942-1960 at the Dow Chemical Company were reported. 12 The study population was defined as production workers at one manufacturing facility who worked in areas with potential vinyl chloride exposure. Each job classification was assigned an expo sure rating of low, intermediate, or high depending upon the existing industrial hygiene data. This is the only available mortality study in which vinyl chloride exposures could be reconstructed using actual air measurements. Three categories of exposure were defined based upon estimated time-weighted average concentrations for an 8-hour day. The low-exposure group consisted of those with TWA concentrations below 25 ppm vinyl chloride, the intermediate group had TWA exposures ranging from 25-200 ppm, and the high group was characterized by TWA exposures of 200-300+ ppm. Also included in the high group were those with TWA exposures in the intermediate range but who were also exposed to frequent unpredictable excursions above 1,000 ppm. A fourth category of indeterminate exposure was defined for individuals working in areas where insufficient air monitoring data were available, a subjective evaluation suggested that for these individuals, exposures were mostly in the low to intermediate range. -- 7 3 -9- ucc 011785 i'l I 1'^. nn' crr I.': * * i ( (>: I,'*', ' V<-` ' !. * I rr Assignment to exposure groups was determined by the highest exposure experienced for one or more months. By this procedure, the lowest /\ exposure category contained only Individuals with low exposure whereas the highest exposure group Included some Individuals with predominantly lower exposures. Duration of exposure was considered based upon two categor1es--1ess than one year, and one year or longer. Accordingly, effects of longer durations of exposure well above one year were not adequately examined, although the Impact of latent period since onset of exposure was considered In the analysis. A number of members In this study (72) had histories of exposure to both vinyl chloride and arsenlcals. In view of the cancer risk associated with arsenlcals, the employees with arsenic exposure were excluded from dose-response relationships related to vinyl chloride. Expected deaths In this cohort were determined from United States white male mortality rates. Death certificates were obtained for 86 of the 88 Individuals known to have deceased. Of the 148 individuals who had left the company, 131 Individuals were successfully traced. Among the Individuals who had worked with arsenlcals and vinyl chloride, 7 of 10 deaths Mere due to neoplasms compared to 1.9 cancer deaths expected. No lung^cancer was noted In this group. (Among workers exposed to VCM but not arsenlcals, observed deaths were 91X of the expected deaths based upon the U.S. white male population, suggesting a possible increase compared to other chemical production workers at the same site who experience mortality rates 15-20% below the U.S. white male population. No deaths due to angiosarcoma of the liver or other liver cancers were noted in the .qroup exposed to vinyl chloride -10- Ucc 011786 DRAFT i'o not quote or cite but not arsenicals. For this group as a whole, total malignancies were less than expected; 13 observed compared to 15.4 expected. The effect of exposure grouping upon malignancy rate was examined for this cohort exclusive of arsenical workers. Of 163 individuals in the high exposure group, only 27 had 20 or more years at low to high exposure and only 19 had 10 or more years of only high exposure. Of the 13 malignancies observed in this cohort, 9 occurred in the highexposure group, compared to 5.1 expected. Due to the small number of deaths involved, this difference was not tested for statistical sig nificance. To examine for possible latent effects, the mortality experience of workers with 15 or more years since onset of exposure was studied. In this group, 9 malignancies were observed, 8 of which occurred In the high-exposure group. Accordingly, 8 of the 9 malignan cies observed in the high-exposure group occurred 15 or more years after onset of exposure. Shown in Table 7.3.3 are summaries of the results. Based upon this study, the authors concluded that workers exposed to vinyl chloride a.t levels above 200 ppm experience an "apparent increase in overall malignancy rate." When exposures were kept below 200 ppm a decrease in the malignancy rate was found. Angiosarcomas of the liver were not found at any level of exposure. Among the workers exposed above 200 ppm TWA, the increase in overall malignancy was not statistically significant. The authors also commented as to possible cocarcinogenic effects of other exposures with vinyl chloride, particularly benzene, cigarette smoking and arsenic. 7,i -11- uec 011787 DRAFT CO NOT QUOTE OR CITE Table 7.3.3 SUMMARY OF DOW MORTALITY STUDY 12 Study Population a) Years exposed: 1 year or more b) Onset since first exposure: No restriction c) Size of cohort: 594, total;522 with VC exposure only d) Number successfully followed up: 577* SMR's (excluding arsenic workers) _o/i_ All causes All cancers a) All VC exposed b) Only high exposure group -- Less than one year exposure --One year or more exposure c) High exposure group with 15 years after onset of exposure -- Less than one year exposure -- One year or more exposure 78/85.7 13/15.4 9/5,1 3/2.2 6/2.9 8/3.2 3/1.3 5/1.9 3MR 91 84 176 136 209 250 231 263 *SMR = standardized Mortality Ratio. t 2- -12- ucc 011788 / m 11' do i::t quote on cit In reviewing these data, certain strengths in this study are evident, expecialiy the availability of measured vinyl chloride exposures and the successful followup of over 95% of the cohort. Several weaknesses must, however, also be mentioned. The high, exposure group was composed pre dominantly of individuals with a range of exposure from low to high levels. Since only one month of high exposure was required to place an individual in this group only 19 of 163 members in this group, had exposures exclusively to high levels for periods of 10 years or more. Accordingly, though all members in this group experienced some vinyl chloride exposures in the range of 200-300+ ppm TWA, it is likely that this group as a whole had TWA exposures which were, in fact, below 200 ppm when averaged over the work histories of all members in this group. Further, the frequency of high exposure in this group Is also not known and this may be impor tant with respect to repair mechanisms. On this basis, increased malignancies might have occurred among Individuals with lifetime average exposures below 200 ppm. Another weakness is that duration of exposure to vinyl chloride was not adequately considered in this analysis. For example, 7 of the 9 individuals in the high exposure group with malignancies had been exposed to vinyl chloride for more than 10 years, but only 66 of 163 individuals in the high exposure group had 10 years or more exposure to vinyl chloride. In this regard, reanalysis of the data for those with only 10 years or more exposure might have re- suited in greater increases in observed compared to expected malignancy rates. Monson et. al. conducted a proportional mortality study among workers in a vinyl chloride monomer plant in Calvert City, Kentucky and among workers 13 14 in a vinyl chloride polymerization plant in Louisville, Kentucky. Death certificates were used as a source of cause of deaths and certificates I'l -13- ucc 011789 / were obtained for 142/161 white males employed at these plants who were known to have died. When death certificates were not available, cause s' of death as recorded In company abstracts were used. Causes of deaths for these 161 Individuals were tabulated covering the period 1947 through 1973 and these were compared with the expected distribution of deaths as calculated from proportional mortality ratios for United States white males accounting for age and time of death. Since mortality patterns among workers In both plants were similar, these groups were combined for purposes of data analysis. Overall, a statistically significant 50% excess In deaths due to cancer was observed. Five cases of liver angiosarcoma were identified In this study in addition to cancers (one each) of the gall bladder, common bile duct and an unspecified case of liver cancer. All told,a 900% excess In cancers of the liver and bilary tract was observed. If the cases of angiosarcoma were excluded from this analysis, a 275% excess In these cancers was observed. Five cases of brain tumors were also found as were 13 cases of lung cancer. These represented 320 and 60% excesses above the expected frequency of these cancers, respectively. A 100% excess in deaths due to suicides was also noted. In addition to these overall cancer excesses, an increasing trend of cancer deaths with time was observed. No excess deaths due to cancer were observed prior to 1965. However, In the period 1965-69 about a 50% excess In total cancers was observed and In the period from 1970 and later a 100% excess in total cancer deaths was found. 7 l -14- ucc 011790 l lJ r ' *" U J >'u jVV1 ` uT * CV This trend is generally consistent with the clustering in recent times of reported occupational cases of liver angiosarcoma. These data infer that at-least two other forms of cancer, lung and brain, in addition to liver cancer, are increased among vinyl chloride workers. The present analysis did not examine the absolute risk of death in the study population, which conceivably could be less than in the general population. However, the observed excesses in specific was considered by the authors to cancers combined with the time trend for all cancersi' suggest a relation ship between exposure to vinyl chloride in the work environment and cancer at multiple sites. Nicholson et al. utilized Union and Company records to identify a cohort of 257 individuals each with a history of occupational exposure to vinyl chloride in a polymerization plant for at least 5 years 1C subsequent to 1946. This cohort included all individuals employed in this plant during the period 1946-1963. The mortality status of these individuals was evaluated from the tenth anniversary of their employment through April, 1974. The minimum S^year exposure criterion was established to focus upon the effects of significant durations of exposure. Beginning observations after only 10 years or more since onset of first exposure was meant to emphasize the possible long term effects of vinyl chloride. The majority of individuals in this cohort, however, were exposed to vinyl chloride for a period of 20 years or under. This cohort represents a relatively young group since over half of the men were under age 37 when they entered the cohort. Over half of the men are presently employed in the PVC production facility though not all in locations with vinyl chloride exposure. 7.1 -15- ucc 011791 do ;;or quote cr Cm Of the 257 individuals in this cohort, 255 or 99% were successfully traced and their current health status evaluated. The majority of these * men were directly employed in production although maintenance men and non production workers were also included. Thus exposures varied considerably among study subjects. Unfortunately no measurements of actual exposures were available and no effort to consider exposure in the data analysis was made except for the exclusion from this cohort of those Individuals employed exclusively as plant guards or outside the reactor and dryer buildings. Over half of the workers, however, reported experien cing symptoms of dizziness, headache or euphoria during work periods and 14 had experienced episodes of loss of consciousness. Accordingly, the authors concluded that peak vinyl chloride exposures may often have exceeded 1,000 ppm and may have ^ occasionally approached 10,000 ppm in this production facility. Included among the 24 deaths identified in this cohort were 3 confirmed cases of angiosarcoma of the liver. Despite the limited observations, the excess in total mortality and in deaths from cancer in this group (presumably compared to the white male U.S. population) is unusual in view of the relatively short period of followup. These preliminary findings suggest an excess in all deaths of 25* and a 131% excess in all cancer deaths though in neither case did these excesses reach statistical signifi cance. In addition to liver angiosarcoma, one brain cancer and 2 lymphomas were observed, causing the authors of this study to consider, in view of the rarity of these cancers, a possible relationship oetween VCM exposure and effect. A study of mortality and morbidity among current and past employees at two vinyl chloride polymerization facilities was conducted by the 7,1 -16* ucc 011792 2 National Institute of Occupational Safety and Health. The criteria for selection of these study facilities were in order of decreasing priority: (1) involvement in the polymerization of vinyl chloride for at least 15 years; (2) existence of a sizable work force; (3) location in a state where vital status ascertainment would be facilitated; and (4) existence of an inhouse medical program. Since cancer often takes many years to become clinically evident, the study population was restricted to individuals with 5 or more years employment and at least 10 years since onset of employment in depart ments directly involved in polymerization of vinyl chloride. The study population consisted of 930 white males. Followup of study members was endeavored from the time of employment termination to December 31, 1973. Unfortunately, 285 individuals (31%) were not successfully followed up, and it is unknown how the mortality experience of these people com pared to those who were successfully traced. All individuals not successfully traced were considered to be alive and were included in the analysis, thereby making any findings of increased mortality in this study cohort a conservative estimate of risk. Comparisons between observed risk of death in the study population and expected risk based upon mortality rates for the general white male population of the United States were made. Measurements or estimates of previous exposure levels to vrm were not. included in this study--an important limitation. A total of 109 deaths were observed among these polymerization workers compared to 105 which would have been expected. Though this difference ucc 011793 / / DO NOT QUOTE OR CITE is not statistically significant, it is still noteworthy since most occupational groups have a favorable mortality experience compared to the general population. Any deaths-ijj the 31% lost to followup would, of course, have Increased the observed number of deaths even more. An evaluation of specific causes of death indicated that, except for cancer, causes of death in the study group did not differ from those expected in the general population. However, a statistically significant (P <0.01) 57% excess in cancer deaths above that which wolild have been expected was observed. This excess could increase as the status of those lost to followup is ascertained. Within this cancer category, excess deaths were not limited to any single organ system, excesses being observed for cancers of the respiratory system, blood forming tissues, and the brain and central nervous system. Deaths due to liver cancer in this population were almost 12 times above the expected number, and brain cancer deaths were increased fivefold. These latter contrasts were statis tically significant (P <0.01 and P <0.05, respectively). It Is not stated whether excesses in liver cancer besides angiosarcomas were observed. The majority (25/31) of observed cancer deaths in this study population did not occur until at least 15 years following first exposure to vinyl chloride. 7.3.4 Shown in Table / is a comparison of the NI0SH mortality study with other mortality studies conducted by Tabershaw/Cooper Associates, the Mount Sinai School of Medicine, the Dow Chemical Company and Harvard University. It Is evident that the results of all studies are reasonably consistent and together suggest an overall excess in cancer mortality among workers exposed to vinyl chloride for long durations. Both the NI0SH and Mt. Sinai 7.1-18- ucc 011794 ucc 011795 Ut--J Crt O I -- ., , Cx_ <=C O CC => qo* t-- o *-- o o 1 Table 7.3.4 A COMPARISON OF MORTALITY STUDIES AMONG VINYL CHLORIDE WORKERS Comparlson Number of Plants 'S'fo.n 33 Study Dow1,2 1 NIOSH2 2 Mt Sinai5 1 Harvard13,14 2 Study Population a) Yrs. exposed 1 yr or more b) Onset since first exposure No restriction c) Size of cohort 8,384 d) No. successfully followed up 7,128 (85*) e) No. of deaths 352 1 yr or more No restriction 522 505 (97*) 88 5 yrs or more 5 yrs or more No Restriction At least 10 yrs 930 645 (69*) 109 At least 10 yrs 257 / 255 (99*) 24 No Restriction -- "" 161 SMR's or Relative Risk All causes of death All cancers 75 110 (total ) 114 (only those with 5 yrs or more exposure) Multiple cancer sites suggested Angiosarcoma of the liver found Yes Yes 91 84 (total) 250 (only those with high exposure with at least 15 yrs after onset of exposure Yes 103 157** Yes 126 231 Yes No Yes (?) Yes * Statistically significatn at p <0.05 ** Statistically significant at p <0.01 -- 150* o o -r O-4 Yes (Cc:P: to r*:! Z| Yes ` C~> ---t m DRAFT DO NOT QUOTE 00 CITE studies which employed the same study criteria also suggest a disfavorable overall mortality experience among these workers, but neither comparison shows statistically significant differences in this regard. It is note worthy that in each study, workers exposed for 5 or more years to vinyl chloride had greater than expected frequencies for all cancers ranging from 41-150% excesses; however, in only two studies were these excesses statistically significant at the 0.05 level or lower. The close similarity of these studies to the animal toxicology data also showing multiple g organ Involvement In carcinogenicity Is worthy of note. In evaluating these observed mortality effects among vinyl chloride workers It must be recognized that the workplace situation may Include exposures to other carcinogens and/or liver toxins in addition to vinyl chloride and that any one of these may have contributed to the observed effects. While this situation makes It difficult to draw final conclusions with regard to the role played by vinyl chloride In the development of liver cancer it Is noteworthy that toxicologic studies in mice, rats and hamsters have observed liver angiosarcoma following Inhalation exposures to vinyl chloride at concentrations of 50 ppm and higher. * * The liver angio sarcoma lesions observed In these animal studies combined with the observations In Industry stronalv Imolv that vinyl chloride Is related to liver angiosarcoma in man. Most, but not all, cases of liver angiosarcoma to date have been detected among workers involved In the production of polyvinyl chloride from the vinyl chloride monomer. These workers may have been exposed to concentrations of vinyl chloride monomer in excess of the old threshold limit value (200 ppm TUA, 500 ppm celling) at some time In the past and it could be argued from these data that vinyl chloride does not produce liver Z l - 20- ucc 011796 DRAFT DO NOT QUOTE Cl? CITE angiosarcoma in man except at these higher (> 200 ppm TWA) exposures. In support of this position is the fact that liver angiosarcoma has not been reported to occur In workers employed in Southern and Southwestern United States VCM and PVC production plants. These facilities are frequently located outdoors and hence would result in lower levels of exposure to VCM than found in indoor plants. Further, the possibility must be considered that additional chemicals other than vinyl chloride, such as perhaps other halogenated hydrocarbons or trace metals, may have contributed to liver angiosarcoma in some workers. On the other hand, a relatively small number of workers were employed in the VC/PVC production Industry in the 1940's and consequently a sufficiently large number of individuals at all plants may not have been exposed for adequate durations to allow detection of effects in a disease with a long latent period. An adequate period of time may also not have elapsed since the onset of exposure to permit the emergence of effects among workers from all plants making VC or PVC at this point in time. Most plants in which liver angiosarcoma has not been observed began production of VCM or PVC in 1950 or laterJ8 ?.-* 2 ` ucc 011791 Accordingly,, the limited lw\m 00 NOT QUOTE OR CITE period of observation following onset of exposure among most vinyl chloride workers combined with the long latent period generally required before clinical evidence of disease Is considered the most likely expla nation for failure to observe liver angiosarcoma In workers employed at all plants particularly those In `the..$outhern and Southwestern United' States. Of 12 Southern or Southwestern VCM plants for which data are available, only one was In operation prior to 1950. Of 8 Southern or Southwest PVC plants currently in operation for which there are available data, only one was In operation prior to 1950. 18 With respect to levels of vinyl chloride exposure required to produce liver angiosarcoma, most, but not all, occupational cases reported to data have occurred among PVC workers and consequently may generally have Involved TWIA exposures In excess of 200 ppm with peak excursions in excess of 1,000 ppm. The most definitive evidence for past exposures among these workers comes from actual 8-hour average air measurements ranging from 120-385 ppm and excursions of 2,000 -4,000 ppm among highly exposed PVC workers at the 19 Dow Chemical Company from 1950-1959. Evidence of peak exposure excursions in excess of 1,000 ppm among PVC workers in past years is also derived from the frequent reports of neurological symptoms among such workers. Existence of odors attributed to VCM for much or part of the workday at these plants would tend to support these observations since the odor threshold for 20 vinyl chloride Is believed to be 250 ppm or higher.. ----- Reports of liver angiosarcoma among workers exposed'to VCM but not Involved In the production of PVC, however, Including that of an accountant in a U.S. vinyl cloth Diant would *end t0 araue That at least for some Individuals, liver angiosarcoma may occur at much lower ex posures than encountered among PVC workers. Cases of liver angiosarcoma are reported in a worker employed at 7. 3- - 2 ucc 011798 / DRAFT DO NOT QUOTE OR CITE a VC monomer plant in Sweden and in a worker from England employed at a vinyl cloth plant. 2 Data from the Dow Chemical Company19 show TWA exposures at monomer plants In the years 1973-1974 to generally be under 10 ppm although short-term exposures in excess of 100 ppm have been re ported. A survey by the National Institute of Occupational Safety and Health has shown VCM levels in fabricating plants to range from 1-12 21 ppm ` In the case of workers at fabricating plants, vinyl chloride exposures may result in part from release of trapped monomer in the PVC during processing and/or from inhalation of PVC dust containing entrapped monomer. While it is difficult to reconstruct exposures to vinyl chloride in these Instances, it is likely that exposures for the workers Involved In the fabrication process are considerably less than those for workers Involved directly In the production of the monomer or the polymer. In addition to the carcinogenic effects of vinyl chloride, a consider able body of evidence has become available related to non-malignant, effects in man including reactions of the liver to vinyl chloride. The vast 7> ucc 011799 DRAFT DO NOT QUOTE C.T CITE majority of evidence In this regard comes from observations among In dustrially exposed Individuals. In reviewing these studies of nonmalignant effects among-individuals exposed to vinyl chloride, several criteria for evaluation were established. Included among these criteria were the following: -- Were control group comparisons made either with workers not occupationally exposed to vinyl chloride or with members of the general population? If control group comparisons were Included, how closely were these groups matched to exposed Individuals? -- Were Important covariates considered among exposed and control groups such as age, sex, race, alcohol Intake, drug Intake, exposure to other toxic chemicals either In previous or present occupations or in the non-work environment, age at time of first exposure, latent period since onset of exposure and duration of exposure? -- Adequacy of physical examinations and laboratory tests. Were physical exams performed? What laboratory tests were employed? Are laboratory test specific for Injury caused by vinyl chloride? Were bio chemical tests performed In the same laboratory and at the same period In time? How adequate were quality control procedures in and among performing laboratories? What were the cutoffs between normal and abnormal laboratory findings? And were these consistent? Were duplicate tests run? -- Adequacy of exposure estimations. Was exposure actually measured or was It estimated? If exposure was estimated, how? If exposure was based upon.job categories, were factors such as age of the plant, and type of plant (process and whether indoor or outdoor) considered? 7 J--24- ucc 011800 DRAFT DO NViT nuOTF. OR CITE It Is recognized In establishing evaluation criteria such as listed above that no single study could possibly consider every Important factor. This Is particularly true with respect to many of the recent studies which were performed in an effort to obtain as much possible information In the shortest period of time. These criteria are useful In examining conclusions drawn from existing studies and In Identifying gaps In knowledge that might appropriately be addressed In future studies. All of the studies discussed In this regard are lacking in at least one Important area. Evaluation of the acute effects from vinyl chloride were carried out by Lester et. al In 1963, who reported on animal and human acute toxicity experiments with VCM. Three men and three women were exposed for 5 minute periods twice each day, separated by a 6-hour interval, for three successive days to vinyl chloride concentrations up to 20,000 ppm. Acute toxic effects were observed at concentrations above 8000 ppm (dizziness, nausea, dulling of visual and auditory cues, headaches, etc.). Follow-up examinations of these subjects have not been performed to determine whether or not such exposures produced any conceivable long-term, irreversible effects. Kramer and Mutcher23 correlated clinical and environmental measures for workers exposed to vinyl chloride for periods up to 25 years. The study population consisted of 98 healthy male workers. Exposure indices for these men were based upon actual air measurements at Dow since 1950 and expressed as cumulative dosage (ppm-years) and career time weighted averages con sidering the time each worker speht In critical job classifications. Ninetyfive parameters of history, physical examination and laboratory tests were studied among exposed Individuals and comparisons were made with workers 72--25- ucc 011801 / DRAFT DO NOT QUOTE OR CITE In other departments who had examinations during the same period of time. Of 21 clinical parameters under study, 6 showed significant correlations (P <0.05) with exposure variables, cumulative TWA and cumulative dose. These slgnlflcant^parameters were systolic and diastolic blood pressure, BSP retention. Icterus Index, hemoglobin and beta-protein. The best correlation was between exposure and BSP retention (coefficient of multiple determination, 0.4). Based upon these observations the authors considered the possibility that "___ repeated exposure to vinyl chloride at TWA levels of 300 ppm or above for a working lifetime together with a very low level of vlnylldene chloride may result In slight changes In certain physiologic and clinical labora tory parameters. The possibility of some impairment In liver function tests must be considered even though no overt clinical disease was evident In any of the Individuals studied." It Is noteworthy that a good dose-response relationship between BSP retention and career TWA exposure was observed over the entire range of exposure examined. Based upon the derived regression equation BSP retentions of 12.5% were expected among those with TWA's of 300 ppm and 5.6X among those with TWA's of 100 ppm. A BSP rententlon In excess of 5%,,Is considered to be abnormal In clinical medicine and sug- gests that substantial damage to liver cells may have occurred. 24 Judging from the. data as presented, a small fraction of Individuals with career TWA's of 50 ppm had abnormal BSP retention tests suggesting that liver damage had occurred. Exposure to other liver toxins such as alcohol was not adequately considered in this study. 7,i-26- ucc 011802 / Ulm I nonDO Mr.r V*/ i r\n Observations of liver damage, among workers who fabricate PVC plastic into finished products as well as among workers who convert VC monomers into the polymer Indicate that Injury to the liver among exposed workers is Important and that such damage may occur at lower levels of exposure than is usually encountered Th the production of PVC. In studies from Germany, enlarged livers and spleens as well as abnormal tests of liver function were found In PVC production workers. 25 ' 26 Liver histology from specimens obtained during laparoscopy revealed evidence of liver pathology In a high percentage of cases. These workers had a history of employment ranging from 15s to 21 years but no measures of past vinyl chloride exposure were available and it is not known whether adequate comparisons were made with control groups. Following these Initial reports of liver damage in PVC production workers from Germany, additional studies were carried out in 50 individuals with varying durations of exposure to vinyl chloride during the production of PVC.27 These studies indicated that there was a relation between the duration of exposure to vinyl chloride and the severity of liver damage as determined by histologic examination of biopsy specimens. The most severe evidence of liver pathology was observed for workers with an exposure history in excess of 10 years. Two cases of liver angiosarcoma were observed among these 16 German workers with a history of exposure to vinyl chloride 7.1-27- ucc 011803 do kot c<;; rf r.3 cm of 10 years or more and all workers In this category exhibited evidence of liver abnormality. Among workers with exposure durations of three years and under, all were found to have some form of liver damage, though the severity of damage was generally less than found In workers with greater durations of exposure. Of note 1s"that-al1 5 workers examined who were not directly Involved In the polymerization of vinyl chloride showed signs of minimal damage to the liver parenchymal cells. These observations coupled with reports of hepatomas In animals exposed to vinyl chloride suggests that liver parenchymal cells may be damaged by vinyl chloride.17 Although these studies do Indicate a relationship between exposure duration and histologic evidence of liver damage, the lack of exposure data on these workers makes It difficult to determine what levels of exposure may have been responsible for such damage. Failure to compare exposed workers with a suitable control group not exposed to vinyl chloride and failure to consider the effect of alcohol intake are other limitations which deserve mehtlon. Examinations of 70 out of 128 workers In a PVC production plant re vealed evidence of extensive abnormalities based on biochemical indicators 90 and other tests. These workers were employed an average of 7.7 years in the Industry (range 6 months to 21 3/4 years). Upper abdominal complaints were present In 42 of 70 workers and symptoms such as tiredness, dizziness, parastheslas and arthralgia were frequently reported. Thrombocytopenia, Increased BSP retention, and splenomegaly were present in a majority of cases, 81,67 and 57* respectively. Retlculocytosls was also coranon (41 %) and abnormal liver enzymes.esophageal varices and leucopenla were also observed. Unfortunately, effects of exposure, both level and duration were not evaluated In this study. Further, the frequency of abnormal findings among workers 7% -28- UCC 011804 / not exposed to vinyl chloride was not studied so that it is difficult to accurately judge the effects of such exposure. Findings such as splenomegaly, throinborytopenia and increased BSP retention in the majority of instances does, however, suggest that damage in excess of the expected frequency among the general population had occurred in these workers though these changes were not necessarily specific for vinyl chloride. To assess the possible Implications of these findings, additional studies were carried out among workers in Germany employed in PVC processing plants. Such workers would have had a somewhat lower exposure than those Involved In the direct polymerization of PVC from the monomer though they would be exposed to vinyl chloride as for example during rolling and shaping operations particularly when heat was required. Medical examinations were conducted among 15 such workers who were employed an average of 5 years, 29 ranging from 1* to 13 years. Seven of these workers complained of pressure and/or pain in the upper abdomen. Thrombocytopenia and increased BSP retention (a test indicating abnormal functioning of the liver) were found in 7 of 15 workers though not necessarily concommitantly. One worker was observed to have an enlarged spleen. Of 4 workers in this group who underwent laparoscopy and liver biopsy, one showed histologic evidence of liver damage similar to, though less severe than, that observed In PVC production workers. Though comparable control groups were not examined, the similar histo logic damage in one worker to that found In PVC production workers suggests that lower level exposures to vinyl chloride (unfortunately not measured) may also cause liver damage. 7.1 -29- ucc 011805 / DRAFT DO HOT QUOTE CO CIT." Some, but not all. Investigations carried out in the United States also observed liver damage among workers exposed to vinyl chloride. At the ELF. Goodrich plant at Louisville, Kentucky, for example, 1183 em ployees had blood tests to screen for^evidence of liver damage. These workers Included individuals involved in other than the direct production of PVC such as maintenance personnel, administrators and secretaries. On an initial screening test (SMA-12), 315 of 1183 or 26.6% showed at least one abnormal blood test and 41 or 3.5% had 2 or more abnormal tests. Among the 315 tested for a second time, 75 had a persistent abnormality. The most common observed abnormality in this test was an elevated alkaline phosphatase although Increased bilirubins and SGOT's were also observed. Based upon this Initial battery of screening tests, 116 Individuals were given more extensive blood tests which indicated the presence of some abnormalities In 59 or about 50% of those examined. Seven of these indi viduals had major abnormalities which required additional procedures. The highest percentage of abnormal batteries (10.9%) occurred among PVC production workers, although abnormal batteries were also found in other production workers. In maintenance workers and In non-production workers such as clerical personnel. Depending upon results from the battery of tests, more elaborate diagnostic procedures such as liver scans, hepatic arteriograms and liver biopsies were Initiated. Of 17 individuals undergoing such tests, 11 cases of portal fibrosis. Indicating severe damage to the liver were uncovered. Two of these cases occurred amonq workers no* directly Involved in the oroduction of PVC raising the possibility of damaqe at relatively low levels of exDosure. In 2 of these 11 workers, both Involved in PVC production, 7-i -30- ucc 011806 \ h\, '.i L'J n;:i QoCi'if. angiosarcoma of the liver was found. While this study in Louisville did document evidence of damage related to vinyl chloride; i.e. liver angiosarcoma, it is not at all clear from this study, the extent to which less severe liver damage may or may not be related to vinyl chloride. Although there is suggestive evidence that less severe damage may also have occurred, adequate comparisons were not made with matched control groups, and measurements of vinyl chloride exposure were not made. Accordingly, level of exposure could not be related to observed effects. Failure to correlate abnormal tests with duration of exposure or with latent period since onset of exposure, and lack of consideration of alcohol intake are additional limitations In this study. Studies carried out In a PVC production plant in Niagara Falls did consider several of the factors not examined in Louisville; i.e. duration of exposure and alcohol intake but unfortunatley did not measure exposure directly. In this instance, a total of 354 workers were examined, 267 of whom were currently employed in a vinyl chloride polymerization plant encompassing nearly the entire work force. Also examined were 87 former workers. Hepatosplenomegaly was observed in a high percentage of current and former ly exposed worxers (75.0 and 3.4% respectively) with the most frequent occurrence in each category among workers exposed for 20 or more years. Though hepatosplenomegaly was generally less frequent among former workers, in present workers hepatosplenomegaly was observed among 6% of workers with a history of exposure not greater than 2 years' duration and there was a 7, l -31- ucc 011807 rv> DO r \ \\ t | rv' < ' - f''i i if sharp increase in this abnormality among workers exposed for more than 5 years. Nearly one-third of current workers exposed for 20 or more years showed enlarged livers or spleens. Though hepatosplenomogaly was generally higher in each exposure category among'Ehose with a history of significant alcohol intake compared to those with no significant intake, in each group, the frequency of hepatosplenomegaly was related to duration of work ex posure. Abnormal tests of liver enzymes were also present even among those with exposures of not more than 2 years' duration and these abnormalities were generally more frequent with increasing duration of exposure. It is of note that elevated alkaline phosphatase, the most frequently observed biochemical abnormality, did not correlate well with ethanol intake but did correlate significantly with duration of exposure to vinyl chloride. In addition to finding evidence of liver involvement in these workers, ab normal tests of pulmonary function and abnormal chest X-rays were also associated with Increasing aurations of exposure to vinyl chloride. While the relation of abnormal findings with duration of exposure suggests an effect related to vinyl chloride, failure to compare these results with the frequency of abnormalities in a matched control group not exposed to vinyl chloride is an important limitation. Without such Information it Is difficult to evaluate the true significance of these findings. As noted above, not all U.S. studies observed effects among workers exposed to vinyl chloride. One such "negative" study involved an evaluation of health surveillance data on 335 workers with industrial exposures to 7.2 -32- UCC 011808 r DO fi' '1 7 I > i 'Oif i K/**i! IT vinyl chloride at the Dow Chemical Company. 32 This survey was based upon a multiphase screening program that had been available to employees at Dow since 1967. The study population was comprised of production employees who had worked for at least one year between 1942 and January 1972 in areas with potential vinyl chloride exposure who were also employees of the Dow Midland Division between February 1967 and March 1974, the period of the multiphasic health screening program. Exposure categories were based upon industrial hygiene data that had been compiled from 1950 and later using estimated time weighted average concentrations for an 8-hour day. The high exposure group was defined as those with exposures above 200 ppm for a duration of one month or longer; the intermediate group had exposures from 25 to 200 ppm; and the low group had exposures under 25 ppm. A fourth exposure category, undefined, was established for those individuals for whom sufficient industrial hygiene data was not available. A subjective evaluation indicated that most individuals in this latter group were exposed in the low to intermediate range. The participation rate in the multiphasic screening program was about 80% in all exposure groups. The availability of measured exposure data for most of these workers provides a much more objective evaluation of past exposure levels than is available from most other industrial studies. However, it should be noted that by giving precedence to a period of one month's high exposure in defining the highest exposure group, this category may have included individuals with predominantly low level exposures throughout the majority 7,1 -33- UCC 011809 00 Npr QllalE r of their work experience. On the other hand, the lowest exposure category would not have included workers with a history of high level exposure to vinyl chloride. Because of revisions in the multi phasic screening program in 1970, the data obtained before and after this date were analyzed separately. A control group of matched pairs for sex, age, smoking history and month of exam and where possible date of hire was included in the analysis. The parameters studied prior to 1970 included tests of pulmonary function, blood pressure, white blood count, total bilirubin, SGPT and alkaline phosphatase. The only statistically significant difference (P <0.05) between exposed and matched pair control groups was for decreased diastolic blood pressure in the high exposure group. No differences between exposed and control groups were noted in terms of pertinent historical questions including shortness of breath, chronic cough, jaundice, gastrointestinal trouble, numbness In hands or feet, cancer, anemia or blood problems. The health surveys conducted from January, 1971, included similar historical Information and laboratory tests for pulmonary function, hemoglobin, white blood count, SG0T, LDH, total protein, protein albumin and protein globulin. Statistical analysis of alkaline phosphatase was not performed due to changes In laboratory procedures. No statistically significant differences between exposed and control groups were found. The availability of measured exposure data and the comparability of laboratory results with the Inclusion of matched pair controls for each exposure category in this investigation overcomes many of the important 7J -34* ucc 011810 fy^nr oa no i quo ft CITE shortcomings In other available studies. Latek of information as to possible toxic chemical exposure in the matched pair controls and failure to consider the impact of duration of exposure to vinyl chloride are, however, important shortcomings in this study. 3y defining the study population as those who had been exposed to vinyl chlordie for at least one year without further considering the impact of duration of exposure, the exposed groups may not have included a sufficient number of individuals with longer durations of contact with vinyl chloride to necessarily be manifest in effects. A major addition to this study would have been the inclusion of clinical data based upon physical exams and additional laboratory studies both of which, however, are planned for the future. Based upon the available date the author concluded "___ below 200 ppm nothing of statistical significance has been observed." It is, however, considered unlikely that the high exposure group was really exposed to TWA exposures of 200 ppm over the lifetime uf their employment since high exposures of only one month's duration were sufficient to plase an individual into this category. As noted above, an earlier study at Dow suggested that liver damage may have occurred among some workers with TWA exposures of 50 ppm.23, Kotin reported the results of a study of currently employed workers exposed to vinyl chloride at Air Products and Chemicals, Inc. facilities as well as the results of a death certificate survey of PVC employees who had left the company or died while employed at the company. Plants at Calvert City, Kentucky, and at Pace. Florida were included in this survey. A detailed medical history was taken on each employee examined and physical exams with X-Rays and laboratory procedures were performed including tests of liver function. 7. \ dcc 011811 / DRAFT DO NOf OIJlilL or cjtf At Pace, Florida, 13 of 201 employees examined were found to have ab normal. findings. Persistent minor abnormalities were found on retesting of / 3 employees but these were not considered sufficient to justify further immediate retesting although retesting 90 days later was scheduled. The remaining 6 employees were given liver scans, all of which were normal. One case of acroosteolysis was found at Pace, Florida. At Calvert City, Kentucky, tests were performed on 291 employees, 97 of whom showed an abnormality on initial testing; partly due to equipment malfunction. Following retest, 29 employees showed persistent abnormalities, 16 of which were considered equivocal, not justifying further immediate additional testing but Indicating retesting 90 days later. Among the 13 employees who were immediately retested, 6 showed findings Indicating the need for further laboratory and physical exams. Of these,2 cases of Gilbert's disease, and 2 cases of gallbladder disease were found, including one with coexistent hepatitis. An additional case of chronic persistent hepatitis without gall bladder disease was found. Examinations of the death certificates did not Indicate any relation ship between exposure to vinyl chloride and cause of death. the au?horl^conclu5eletKIIU^tS* exce'5t fr ^e one case of aeroosteolysis /there was no evidence to identify vinyl chloride as a causative agent in disease. No cases of angiosarcoma were Identified in this survey. In presenting these data no Indications are given as to how age, level and duration of exposure may have varied among these who were tested. No definition of what constituted an abnormal test was given and no effort 7.1 -36- ucc 011812 IV m r r DO NOT :uill G.7 '! r' was made to contrast exposed workers to a comparable control group. Measurements of vinyl chloride exposure were not made nor is there any indication as to what percentage of workers examined were suspected to have high vinyl chloride exposures. The adequacy of followup among workers who had left the plants with respect to the death certificate survey is similarly not indicated, and no data are presented as to the frequency of abnormal findings on physical exams, particularly enlarged livers and spleens. While it is encouraging to note that no cases of angiosarcoma were observed, careful followup of these workers would appear indicated, particularly since both plants under study were opened in the late 1950's. IP. Accordingly an adequate latent period following onset of first ex posure may not have been present to allow effects such as liver angiosar coma to be evident. A survey of 36 PVC plants was conducted to determine if there were factories in which no cases of liver angiosarcoma were observed despite the presence of adequate exposure to vinyl chloride to have caused disease as defined by time and concentration. Plants in which angiosarcoma had occurred were not included in the analysis. Similarly plants with operating experiences of 10 years or less were also discarded from the analysis. The remaining T6 plants Included 2,372 persons currently employed and 1,471 previously employed, not all of whom had durations of exposure long enough to be manifest in angiosarcoma. Included among these individuals, however, were 787 persons who had worked more than 10 years and 104 persons who had worked more than 20 years with vinyl chloride. Also included were 7 9 -37- uec 011813 r;'A!'t PH |\J! Ociu i L OR CTE 1,402 persons with a time lapse since first vinyl chloride exposure of more than 10 years and 416 persons with a time lapse of 20 years or more. S\ Of these 16 plants only 2 ha4-conducted measurements of vinyl chloride concentrations prior to 1970. Accordingly, the presence of vinyl chloride odors was used to estimate past exposures. The odor threshold for vinyl chloride is in the vicinity of 250 ppm though it may be much higher. On this basis 4 companies indicated that vinyl chloride odors were detectable for most of the work day prior to 1960; only 2 of 16 plants reported odors most of the day between 1960 and 1970 and no plants reported odors this frequently after 1970. However, all 16 plants reported the occasional presence of vinyl chloride odors at some time In the past although this was never considered to be a rare event, particularly prior to 1960. In view of these observations, exposure to time weighted average concentrations of vinyl chloride were considered to have exceeded 50 ppm in recent years and 250 ppm prior to 1960. Since January 1, 1974, 3,285 examinations were conducted on employees in these companies including 872 retirees. This constitutes a follow-up rate of nearly 90* of all employees, but only 602 of those who were previously employed. Of these men, 3,249 were given liver profile tests as Included In the SMA-12, i.e. bilirubin, SGOT, LDH and alkaline phosphatase. An abnormality In one of these four tests was reported in 15* of those examined, but this fell within the levels of abnormality observed among 900 Union Carbide employees not exposed to vinyl chloride and 400 office personnal with no known occupational chemical exposure. Similarly, the 71 08- ucc 011814 / occurrence of abnormalities in 2 tests (2.7%) and in 3 tests (1.3%) were comparable to those found in control groups. No mention is made of reports of findings on abnormal physical exams. In making these comparisons, no information is given as to ihe makeup of vinyl chloride exposed compared to control groups particularly with respect to covariates that may have affected test results. Similarly no definition of an abnormal test is given and there is no information as to quality control efforts among the various laboratories participating in these tests. Based upon these observations the author concluded that "Examinations of these men have failed to show the existence of abnormal liver function tests in greater proportion than would be found in a control population. There is no case of angiosarcoma of the liver among these 1,402 men even though their exposure time is sufficient for disease to have occurred-----" In drawing this conclusion, however, it should be noted that only 104 individuals had worked more than 20 years with vinyl chloride and 416 individuals had a time lapse since first exposure of 20 years or more. This would seem Important since, of the 19 worldwide reported cases of angiosarcoma among PVC workers for which details are available, 15 had a time lapse since first exposure of 15 years or more and 14 had 15 2 years or greater exposure to vinyl chloride. 7 i -39- ucc 011815 / * t- ^ ,nifTi v [ " r:;-r r-n' ' \J V I / | | t Considering the lack of information on control and exposed groups and the many laboratories participating in these analyses, it /' 'i appears difficult to draw any conclusions with regard to the frequency of abnormal liver function tests among these vinyl chloride workers. The fact that only 60* of former workers who may have had the greatest durations of exposure were included in these examinations of liver function tests is a serious shortcoming, as is failure to examine the influence of duration of VC exposure upon abnormal liver function tests. A summary of the data showing non-mallgnant effects of vinyl chloride is shown in Table 7.3.5. The results of these studies and their limitations have been discussed above. These observations of liver injury among PVC workers and particularly among workers not directly Involved in PVC production, have potentially Important implications with respect to the health of the general population exposed to vinyl chloride. In reviewing these findings it is, however, important to recognize that other toxic agents either work or non-work related,such as liver toxic drugs or alcohol could have contributed to many of these abnormal findings. Further, some of the biochemical screening tests are not specific for liver Injury, though others such as BSP are. Ideally, one would like to know the prevalence of liver Injury among com parable non-Industrially exposed populations before drawing final con clusions regarding the effect of exposure to vinyl chloride upon the liver from the above studies. Most studies were lacking In this regard. In spite of difficulties with the present studies such as noted above, there 7- 3 ucc 011816 / ly s-<i I ' Vi-'U i C U'K1 i - Table 7.3.5 SUMMARY OF OCCUPATIONAL FINDINGS RELATING NON-MALIGNANT LIVER DAMAGE TO VINYL CHLORIDE EXPOSURE Study Group (Number studied) Level of Exposure Duration of Exposure Observed Effects PVC Production workers 25,26 PVC Production workers ^5 liver biopsy Study2*7' Unspecified Unspecified l'j to 21 years Enlarged livers and spleens Abnormal BSP retention Biopsy of liver showed portal fibrosis a) 3 years and under b) 10 years and more a) Biopsy showed mild liver damage in all workers b) Relation between duration of exposure and severity of damage with most severe liver pathology observed in workers with 10 or more years of exposure Post - PVC polymerization workers5 - liver biopsy study27 Unspecified Unspecified but likely exposed to lower levels of VC than workers in volved in polymer!* zation process All 5 workers examined showed evidence of mild damage to liver parenchyma based on liver biopsy PVC Production workers -- 70,28 Unspecified PVC Processing Unspecified workers 8,20 not involved in PVC polymerization but exposed to PVC as a finished product and hence by inference exposed to lower levels of vinyl chloride than PVC production workers 6 mos to 21 3/4 years (average 7.7 years) Upper abdominal complair.t lethargy and parresthesias coninon complaints Thrombrytopenia, increased BSP retention and splenemegaly found in majority of workers l*a to 13 years 7/15 workers complained . of pressure or pain in upper abdomen Thrombrytopenia in 7/15 workers Increased BSP retention in 7/15 workers Biopsy showed mild liver damage similar to that in PVC production workers 7- J ucc Table 7.3.5 (Continued) Study Group (Number studies) Level of Exposure Duration of Exposure Observed Effects PVC Production workers, and non-PVC 3Q production^ workers.(1183 total) Unspecified Unspecified 116/1183 or about 107. ahowed significant bio chemical abnormalities; abnormal liver function tests found in non-PVC production workers 11 cases of oortal fibrosis found on liver biopsy, 2 of which were in workers not directly involved in PVC production Current and former Unspecified PVC production workers (354 total) 3t a) < 2 years b) 5-10 years c) 20 years or more a) Hepatasplonomegaly observed in 6% of workers exposed not more than 2 years b) Sharp increase in hepatasplonomegaly in workers exposed greater than 5 years c) Nearly one-third of workers exposed 20 years or more had hepatosplenomegaly Elevated alkaline phosphatase correlated with duration of exposure Abnormal lung function tests found PVC Production workers (98)23 TWA expo- sures up to 300 ppm Up to 25 years Abnormal liver function (BSP retention) correlated with TWA exposures ~ Evidence of abnormal BSP retention at TWA exposures of 300 ppm and suggestive evidence of BSP retention in some workers exposed to TWA of 50 ppm PVC and nonPVC production,., workers (335) J PVC workers (492)33 TWA exposures of 25-200+ ppm Unspecified 1 year and greater Unspecified No adverse effects related to angiosarcoma One case of acro-osteolysis only evidence of injury attributable to VC PVC workers (3,843)20 Estimated as greater than 250 ppm prior to 1960 Includes exposed 20 years and more r` No increased abnormalities above levels in control groups VJCC 011818 iv? not Qucrr no r,ur is suggestive evidence presented for at least minimal liver damage associated wi th vinyl chloride which may be observed with durations of exposure under 2 years. Though there is reasoft-jto believe that cessation of exposure to vinyl chloride would cause a reversal in some of this damage; there is also evidence that in some people, this damage is not fully reversible and may even progress further. For example, one vinyl chloride production worker examined by liver biopsy at the National Institute of Health showed persistent and perhaps progressive liver pathology t\ years after the cessation of exposure despite an absence of abnormalities in biochemical tests of hepatocellular function. 34 There is also concern that the his tologic changes in the liver observed in PVC workers may represent premalignant changes that would increase the risk of developing angiosarcoma in future years. Any final conclusions regarding the implications of these findings for the general population who are exposed to levels of vinyl chloride in the air generally much lower than in occupational situations must await completion of additional studies. However, several observations do suggest that exposure to vinyl chloride in the air may pose some risk to health at these lower levels. ucc 011819 ir f 7.3.1 REFERENCES DO nor Q{ rr Heath, C.W., H. Falk and J.L. Creech. Characteristics of Cases of Angiosarcoma of the Liver amoncTVinyl Chloride Workers In the United States. Paper presented at working group on Toxicity of Vinyl Chloride- Polyvinyl Chloride. New York Academy of Sciences, New York City, Hay 10-11, 1974. Wagoner, Joesph K. National Institute of Occupational Safety and Health Statement Presented before the Subconmittee on the Environment Commerce Committee, United States Senate, Washington, D.C., August 21, 1974. 3. Popper, Hans and Louis B. Thomas. Alterations of Liver and Spleen Among Workers Exposed to Vinyl Chloride. Thomas, Louis B. and Hans Popper. Pathology of Angiosarcoma of the Liver Among Vinyl Chloride - Polyvinyl Chloride Workers. Papers presented at Working Group on Toxicity of Vinyl Chloride - Polyvinyl Chloride. New York Academy of Sciences, New York City, May 10-11, 1974. 4. Epidemiology Notes and Reports, Angiosarcoma of the Liver - Connecticut. Morbidity and Mortality, Center for Disease Control, V. 23, #29, June 15, 1974. 5. Letter of June 19, 1974 from Philip J. Landrigan, CDC to Nancy Beach, EPA with accompanying memo of June 16, 1974, entitled Angiosarcoma of Liver, Connecticut, from Medical Epidemiologist, Bureau of Smallpox Eradication to Director, CDC. 71 -^ y ucc 011820 5. Letter from Louis B. Thomas, NCI to Philip Landrigan, CDC, dated July 31, 1974. 7. Memo for the Record: Report of an Angiosarcoma Case. Prepared by: Dr. Robert Biggar, Country He*aTtb Department, Rochester, N.Y., April 9, 1974. 8. Letter from Henry Falk, CDC to Kenneth Sridbord, EPA, dated August 14, 1974 with enclosed autopsy report. 9. Maltoni, C. and G. Lefeimine. Carcinogenicity Bio-Assays of Vinyl Chloride: Current Results. Paper presented at working group on Toxicity of Vinyl Chloride-Polyvinyl Chloride. New York Academy of Sciences, New York City, May 10-11, 1974. 10. Epidemiologic Study of Vinyl Chloride Workers. Prepared by Tabershaw/ Cooper Associates, Inc., Berkley, California, Final Report, submitted to Manufacturing Chemists Association, Washington, D.C., May 3, 1974. 11. Tabershaw, Irving R. and William R. Gaffey. Mortality Study of Workers in the Manufacture of Vinyl Chloride and its Polymers. J. of Occ. Med., 16: pp 509-516, August, 1974. 12. Holder, Ben. The Dow Chemical Company Testimony Presented at Public Hearing--Proposed Standard for Occupational Exposure to Vinyl Chloride. U.S. Department of Labor, Washington, D.C. June 25, 1974. 3. Monson, Richard, R., John M. Peters, and Maurice Johnson. Mortality Among Vinyl Chloride Workers. Paper presented at NIEHS Conference, Pinehurst, N.C., July 29-31, 1974. 73 - ucc 011821 ji,/ Monson, Richard R., John M. Peters and Maurice N. Johnson. Proportional ',"w/ Mortality Among Vinyl Chloride Workers. Lancet, pp 397-398, August 17, 1974. Nicholson, William J., . Cuylor Hammond, Herbert Seidman and Irving J. Selikoff. Mortality Experience of a Cohort of Vinyl Chloride Polyvinyl Chloride Workers. Paper presented at Working Group on Toxicity of Vinyl Chloride - Polyvinyl Chloride. New York Academy of Sciences, New York City, May 10-11, 1974. 16. Keplinger, M.L. et. al. Experimental Studies with Vinyl Chloride. Paper presented at Working Group on Toxicity of Vinyl Chloride Polyvinyl Chloride. New York Academy of Sciences, New York City, May 10-11, 1974. 17. Maltoni, Cesare and Giuseppe Lefemine. Carcinogenicity Bio-assays of Vinyl Chloride: I. Research Plan and Early Results. Env. Res. 7: pp. 387-405 (1974). 18. Memo from Kenneth Baker, EPA, to Kenneth Bridbord, EPA, entitled Employment Exposure to Vinyl Chlordie (VC), August 28, 1974. 19. Daniel, Roger L., Dow Chemical Company, Testimony Presented at Public Hearing - Proposed Standard for Occupational Exposure to Vinyl Chloride, U.S. Department of Labor, Washington, D.C., June 25, 1974. Dernehl, Carl U. Associate Medical Director Union Carbide Corporation, Testimony Presented at Public Hearing -- Proposed Standard for Occu pational Exposure to Vinyl Chloride, U.S. Department of Labor, Washington, D.C., June 25, 1974. (check date) z3 -6 ucc 011822 21. Wagoner, Joseph, HI OSH i'i> Nor c.,* OTr 22. Lester, 0., L;A. Greenberg, and-W.R. Adams. Effects of Vinyl and Repeated Exposures of Humans and Rats to Vinyl Chloride. Industrial Hygiene Journal, May-June 1963. 23. Kramer, C.G. and J.E. Mutchler. The Correlation of Clinical and Environmental Measurements for Workers Exposed to Vinyl Chloride. Am. Ind. Hyg. ASsoc. Jour. 33: pp 19-30, 1971. 24. Harrison's Textbook of Medicine 25. Juhe, S., C.B. Lange, G. Stein and G. Veltman. Uber die sugenannte Vichlchlorid - Krankheit. Dtsch. Med. Wschr. 98, pp 2034-2037, 1973. 26. Marsteller, H.J. Chronic Toxic Liver Damage in Workers Engaged in PVC Production. Deutsche Medlzlnische Wochenschift. 98, 2311-2314, 1973. 27. Gedigk, P. Merphdogy of Liver Damage Among Polyvinyl Chloride Pro duction Workers: A Report of 51 Cases. Paper presented at Working Group on Toxicity of Vinyl Chloride-Polyvinyl Chloride. New York Academy of Sciences, New York City, May 10-11, 1974. 28. Veltman, G., C.E. Lange, S. Juhe and V. Bachner. Clinical Manifes tations and Cause of Vinyl Chloride Disease. Paper Presented at Working Group on Toxicity of Vinyl Chloride-Polyvinyl Chloride. New York Academy of Sciences. New York City, May 10-11, 1974. 73 . - 7 ucc 011823 / DRAFT DO MOT QjOlL CO CITE 29. Lange, C.E., S. Juhe, G. Stein and G. Veltman. Further Results in Polyvinyl Chloride Production Workers. Paper presented at Working / Group on Toxicity of. Jjnyl Chloride-Polyvinyl Chloride. New York Academy of Sciences. New York City, May 10-11, 1974. f 30. Creech, J.L. and L. Malck. Liver Disease Among Polyvinyl Chloride is Production Workers, paper presented at Working Group on Toxicity of Vinyl Chloride-Polyvinyl Chloride. New York Academy of Sciences. New York City, May 10-11, 1974. 31. Lilis, R. et. al. Prevalence of Disease Among Vinyl Chloride and Polyvinyl Chloride Workers. Paper presented at Working Group on Toxicity of Vinyl Chloride-Polyvinyl Chloride. New York Academy of Sciences. New York City, May 10-11, 1974. 32. Cook, Ralph R., The Dow Chemical Comapny. Testimony presented at Public Hearing -- Proposed Standard for Occupational Exposure to Vinyl Chloride, U.S. Department of Labor, Washington, D.C., June 25, 1974. 33. Kotin, Paul, Consultant to Air Products and Chemicals, Inc. Testimony Presented at Public Hearing - Proposed Standard for Occupational Exposure to Vinyl Chloride, U.S. Department of Labor, Washington, D.C., June 25, 1974. 34. Berk, Martin and Waggoner. Persistence of Vinyl Chloride Induced Liver Injury after Cessation of Exposure. Paper presented at Working Group on Toxicity of Vinyl Chloride-Polyvinyl Chloride. New York Academy of Sciences. New York City, May 10-11, 1974. ?3 . ** ucc 011824 "*rSrc.-.., 7.4 Ecology The potential problems associated with release of vinyl chloride into the environment are Just coming-"under scrutiny. For sometime it has been known that the plastic, polyvinyl chloride is not biodegradable. Microorganisms are not able to utilize the plastic or are able to do so only after an extended period of weathering. Although acetylene and ethylene are both capable of being reduced by microbial activity,1 ' 2 their chlorination seems to make them less amenable to attack by microorganisms. Available evidence does indicated that alkenes may be 3 oxidized by heptone grown pseudomonas species. Very little is known 4 regarding the biological metabolism of alkynes. The fact that polyvinyl chloride is not readily biodeqradable has led to the difficulties attendant with the disposal of this form of plastic . Incineration has been the chief means of disposal; however, this method is not without its problems. Hydrogen chloride Is generated in the 5 normal burning of refuse even when plastics are not present. During burning, most of the chloride present in refuse and in the polyurethane and polyvinyl chloride materials, which were added to the base refuse in the test work, was evolved as hydrogen chloride. No free chlorine gas or phosgene was detected. Though hydrogen chloride is evolved when burn ing refuse, the amounts released do not compare to those released when polyvinyl chloride and polyvinyl1dene chloride plastics are incinerated. Addition of polyethylene and polystyrene plastics to normal base refuse containing no plastics had no effect on chloride ion emissions because 1 v ucc 011825 iC draft T mote oh cite these plastics contain no chlorine. Addition of polyurethane foam resulted In slight Increases up to 689 parts per million (0.0689%) when a'2% addition was made to the base refuse and 751 parts per million (0.075%) when 4% was added. Adding polyvinyl chloride to the normal refuse increased chloride Ion emission to 1990 parts per minion (0.1990%) for the 2% addition and to 3030 parts per million (0.3030%) for the 4% addition.^ The effects of hydrogen chloride gas on vegetation have been known since the mid-nineteenth century when damage was noted In the vicinity of 0 alkali plants in Europe and Great Britain. The concentration of hydrogen 3 chloride in stack gases was limited to 0.45 mg/m in 1874. No further reports of crop damage due to this gas occurred after the passage of the Alkali Act of 1906 in Great Britain. Damage due to hydrogen chloride 78 9 gas has been reported In the United States by Weller, Hlndawi and Wood. Antipov1 Reported hydrogen chloride gas damage to ornamental plants near a chemical factory In the USSR which released fumes once or twice a month. Species which were affected Included oriental popj>y, daisy, belleflower, columbine, bluets, and pylox. The study by Wood is the only one which specifically reported the combustion of polyvinyl chloride as the source of the hydrogen chloride gas. The smoke from the combuslon of polyvinyl chloride Insulation at a wire salvage operation in northern Pennsylvania caused extensive damage to several northern hardwood species. Bohne11 reported hydrogen chloride gas damage to shrubs, trees and flowers near a hospital incinerator. 7. a . 2- ucc 011826 dhotqumTORcirr Not all plants are sensitive to hydrogen chloride gas. Means and Lacasse tested the sensitivity of 12 coniferous and broad-leaf tree species to hydrogen chloride gas. The fumigations were conducted under controlled conditions at a temperature of 27 C, relative humidity between 78 and 85%, and a light Intensity of 1.4 x 104 ergs/cm7 sec. Under these conditions the only symptom noted on conifer needles was a tip necrosis on white pine at 8 ppm, on Douglas fir at 12 ppm, and on Norway spruce at 19 ppm. Austrian pine and arborvltae were not Injured at concentrations of 18 and 43 ppm respectively. Symptoms on b'roadleaf species Included marginal and intervelnal necrosis and necrotic flecking. Tulip poplar was Injured at 3 ppm, European black alder and black cherry were Injured at 6 ppm, and sugar maple and Norway maple were Injured at 7 ppm. Red oak was not Injured at concentrations up to 13 ppm. These fumigations were also of four hours duration. The effects of hydrogen chloride gas on vegetation has not been studied In any detail. This probably reflects its unimportance as a phytotoxicant. Hydrogen chloride gas Is easily scrubbed from flue gases and the major sources are point sources; therefore, it has not been emitted into the atmosphere In large amounts. The Incineration of chlorine-containing plastics In large amounts could change this picture. Studies showing the effects of vinyl chloride In the environment 13 are extremely scarce. A study by Heck and Pires in 1962 Indicates that vinyl chloride can cause significant injury to plants. An analysis of the results using five different fumigants at three different levels ucc 011827 / r, W'V7 ^^v'uorfcsc/rF ranked them in the following order, ethylene > acetylene > propylene > ethylene oxide > vinyl chloride. Table 7.4*compares tne five compounds / '. / and indicates the levels at which they were most toxic. The Injury symptoms shown for acetylene, propylene and vinyl chloride were Identical to that shown by ethylene. Ethylene Is usually considered as a physiologically active gas rather than a toxic gas, e.g. sulfur dioxide. Ethylene affects a great number of physiological phenomena in plants, such as ripening of fruits, abscission of plant parts, prolifera tion of tissue. Inhibition of growth and variations In cellular metabolism;14 Ethylene Is a product of plant metabolism, but vinyl chloride has not been reported from natural sources. The effects of vinyl chloride upon microorganisms have not been studied. As mentioned previously, there has been little work done to determine whether alkynes can be metabolized by microorganisms? 15 Ethylene Is taken up by soil; vinyl chloride may be also. A by-product of vinyl chloride production, EDC-tar, has been disposed of by dumping into the North Sea. EDC-tar is a mixture of short-chained aliphatic hydrocarbons. When it is dumped into the ocean, it gradually sinks toward the bottom. As the tar sinks, the components gradually dissolve in the water. Therefore, its sedimentation rate is low. It also has a tendency to adhere to a large variety of substances and form a film or layer around the particles. Plankton are among those particles to which the tar adheres. 16 Studies by Jernelov, Rosenberg and Jensen indicate that marine animals rapidly accumulate EDC-tars from contaminated sea water. An for accumulation factor of 2900 was estimated/shrimp (Leander adspersus) exposed to 0.01 ppm EDC-tar for 48 hours. The accumulation of low molecular weight --r /' ucc 011828 draft Do not TaDle /.4.| tu>l|.A||,M|^ or the Toxicm levels Quot[ or the tiikm- m i.\ i iutions or five fume GAMS ON .11.1. PLANT SPECIES' TwWlf Iced* Fumigant Cnncmttatlwt (PI*o> 1 llliyliitr o\lile 1000 f ltli)linr 10, 100, MM rtnp)Tnie" ** 100# Acetylene 1000 S Aretyknr Vinyl rlilmide 100 1000 4 Art ly kite 9 I'rnpyknc Ethylene oxide 10 100 100 Vinyl chloride IM 9 Propylene 7 Ethylene oxide Vinyl rhlorMc 10 10 10 plant' m (iKoipwt l 7 dayi " enth fnwlf criKrtitralUm. A ipalllati'c urniparkan with I canting the death N * Ml 7 ihowtag w effect. qTF / < ucc 011829 DRAFT DO NOT QUOTE OR CITE compounds of EDC-tar Is highest via water, whereas the high molecular compounds show the greatest accumulation through the food chain. These conclusions are in agreement with the results of studies dealing with Cl-C compounds such as DDT seawater. Dieldrin has also been shown to accumulate rapidly through solution and much less slowly through the 16 food chain. When compared to DDT, PCB and other Cl-C aromatic substances, the biological half-time is short (1 day to 3 weeks). This fact may mean that the effects of ECD-components miqht not be as severe as those of DDT, PCB's and other chlorinated hydrocarbons. Studies made to determine the effects of EDC-tars on different 17 stages in the life cycle of the barnacle Balanus balanoides L. showed * that the stage II nauplll were ten times more sensitive than the older stage V and VI larvae. Age, therefore, seems to make the barnacles more tolerant to the EDC-tars. In an attempt to determine some physiological aspects of EDC-tars at the cellular level, the microorganism, Escherichia coll was 18 studied. The death of the Intact cells was shown to be due to the breakdown of the permeability of the cytoplasmic membrane. The authors suggest that since most known biological membranes are formed according to similar principles, the action of EDC-tar on the cell membranes of higher organisms would be similar. 4 7.^2 Sunriary Polyvinyl chloride plastics are not readily biologically deqradable. This has led to incineration as a means of disDOsal.. Incineration of polyvinyl chloride plastics results in the emission of hydrogen chloride gas. Hydrogen chloride gas is injurious to plants, but emissions can be readily *7- L' UCC 011830 controlled. DRAFT DO NOT QUOTE OR CITE Vinyl chloride Is damaging to plants. Injury to plants from vinyl chloride is similar to that caused by ethylene; however, no extensive studies have been made. The effects of vinyl chloride on. microorganisms has not been studied nor have the capability of microorganisms to metabolize It. Ethylene Is taken up by soil; vinyl chloride may be also. EDC-tars, a mixture of short-chained aliphatic hydrocarbons, are a by-product of vinyl chloride production. When dumped into sea water, they show a tendency to be rapidly accumulated by marine animals. The low molecular weight compounds have the greatest accumulation. In Escherichia coll the death of Intact cells was shown to be due to the breakdown of cytoplasmic membrane permeability. It is suggested that because all biological membranes are formed according to similar principles, the action of EDC-tar on the cell membranes of higher organisms would be similar. 7^ y ucc 011831 7.t.i REFERENCES DRAFT Cl quote dr cite 1. Stanler, R.Y., M. Doudoroff and E.A. Adelberg. The Microbial World. / 3rd. Prentice Hall, EnglewoodJJljffs, N.J. p873. 1970. 2. Zobell, Claude E. Assimilation of Hydrocarbons by Microorganisms. Adv. in Enzymology X; 443-486. 1950. 3. Traxler, R.W. and W.L. Flannery. Mechanisms of Hydrocarbon Degradation, in: Biodetorloration of Materials, Eds, A.H. Walters and J.J. Elplver, Elsevier Pub. Co. Ltd., London", pp. 44-54. 4- McKenna, E.J. and R.E. Kelblo. The Biology of Hydrocarbons. Ann. Rev. Microbial 19:183-208. 1965. Kaiser, E.R. and Carottl, A.A. Miniclpal Incineration of Refuse with 2% and 4* Additions of Four Plastics, A Report to the Society of the Plastics Industry. New York, June 30, 1971. 6. Haselhoff, E., and G. Llndau. Chlorine and Hydrochloric Acid, pp. 230-256. In: Damage to Vegetation by Fumes. Handbook for the Identification and Assessment of Fume Damage. 1903 (German). 7- Weller, A. Corrosive Damage on Foliage Organs Caused by Acids and Tarry Substances. Phytopath. 7:121-144. 1934. 8. Hlndawl, I.J. Injury by Sulfur Dioxide, Hydrogen Fluoride, and Chlorine as Observed and Reflected on Vegetation in the Field. J. Air Poll. Contr. Asso. 18:307-312. 1968. 9, Wood, F.A. The Influence of smoke from the Combination of Polyvinyl Chloride Insulation on Northern Hardwood Forest Species. Phytopathology 58:1073. 1968. 10. Antipov, V.G. Resistance of Perrennlals to Gases. Sadovodstvo (Horticulture): 1:1-2 (Russian). 1956. ucc 011832 DO NOT Q(IOT[ C!T CITE 11. Bohne, H. Problems of Determining the Effect of Gaseous Chlorine Emission Upon Plants. Staub-Reinholt. Luft 29:41-43. 1969. 12. Means, W.E.,Jr. and N.L. Lacasse. Relative Sensitivity of Twelve Tree Species to Hydrogen Chloride Gas. Phytopathology 59:402. 1969. 13. Heck, W.W. and E.G. Plres. Growth of Plants Fumigated with Saturated and Unsaturated Hydrocarbon Gases and Their Derivatives. The Agricultural and Mechanical College of Texas, Tezas. Agr. Expt. Station. MP603. pi2. 1962. 14. Abeles, Frederick. Ethylene in Plant Biology. Academic Press. 1973. 15. Abeles, F. B., L. E. Croker, L. E. Forrence, and G. R. Leather. Fate of Air Pollutants: Remove of Ethylene, Sulfur Dioxide, and Nitrogen Dioxide by Soil. Science 173:914-916. 1971. 16. Jernelov, Arne, R. Rosenberg and S. Jensen. Biological Effects and Physical Properties in the Marine Environment of Aliphatic Chlorinated By-Products from Vinyl Chloride Production. Water Research Pergamon Press. Vol. 6, pp. 1181-1191. 1972. 17. Rosenberg, Rutger. Effects of Chlorinated Aliphatic Hydrocarbons on Larval and Juvenile Balanus balanpides L. Environ. Pollut. 3:313-318. 1972. 18. Hagstrom, A., S. Normark, Toxic Effects and Action of Chlorinated By-Products from Vinyl Chloride Production on Escherichia coli K12. Ambio. 3:77-79. 1974. V, ucc 011833 7.5 VINYt CHLORIDE IN PERSPECTIVE The coiiiDelllnq evidence for the carrinonenicit.v nf vinvl rhlnriHp frnm both an epidemiological and toxicological standpoint raises the question o( ihr possible carcinogenicity of other related chemicals in the ambient air. Tin? possibility exists of multiple exposure to a host of compounds that may ^act additively or synergistically to produce a hazardous health effect. Available data do not allow quantitative evaluation of the hazard of multiple exposures. Published data, however, suggests that compounds similar in metabolism to vinyl chloride which may appear of minor importance when only low dosaaps nf individual substances are considered, could become more important from a health standnnint whn total multi-compound iosage is evaluated. 1 Industrial Production and and Polyvinyl Chloride of Chemicals Related,to liny] J^lorjde Structures, production figures and major uses for chemicals of industrial importance with structure similar to vinyl chloride and polyvinyl S chloride are summarized in Table 7.^.1. 5 7.\.2 Carcinogenicity of Chemicals Related to Vinvl Chloride and Polyvinyl Chloride The publication "Survey of Compounds which have been tested for Carcinogenic Activity"3 was used as the primary source of information on the following chemicals: 1. 1,1-Dichloroethylene (vinylidine): No data has hoen published. 2. 1,2-Dichlor* chylene: No dat has bc.en published. UCC 011834 TABLE 7./.I Chemical 1,1-dichloraethylene (Vinylidine Chloride) PRODUCTION AND USE IN THE UNITED STATES OF CHEMICALS RELATED TO VINYL CHLORIDE AND POLYVINYL CHLORIDE Structure cl H . NJP * ( cl H Production (Million Pounds) Ma.ior Uses Monomer for Vinyl Chloride Copoly mer and Polyvinylidine Chloride Trichloroethylene cl cl cl H 438(1972)1 Metal Degreasing, Manufacturing Solvent Tetrachloroethylene (Perchloroethylene) Vinyl Acetate Polyvinyl Acetate cl 1 c= C cl cl 0 CH3-C-0 JA )c - c if s H 0 0 -"c - CH3 [ch2 CH n Other Vinyl Polymers (Alcohol, Butyral and Formal) 745(1972)1 729(1969)2 422(1970)1 219(1970)1 Dry Cleaning, Metal Degreasing* Chemical Intermediate * I Polymer Production Textile Sizing, Adhesives, Paper Coating, Polymerization Aid /. ucc 011835 3. Trichloroethylene14 nn DRAFT QUOTE OR CITE Several animal species have been exposed to levels from 200 to 3000 ppm for up to six months with follow-up observations up to nine months. No tumors were observed in any animals. 4. Tetrachloroethylene (Perchloroethylene)5 Various animal species were exposed for seven hours a day to 100-2500 ppm for up to 250 days with no tumors discovered. 5. Polyvinyl Chloride6 Film was implanted in various locations in rats for up to eighteen months. Several tumors were observed, but all were in the area of the implant. 6. 1,1,2-Trichloropropene7 Rabbits were dosed orally with compound in oil at 0.1 LD50 for 6 months. There was evidence of changes in lymph nodes after 18 months. 7. Vinyl Alcohol Polymer8 Implants of polymer sponges at various locations in rats for the life span of the rats gave many sarcomas at the site of implantation and a few tumors at other locations., 8. Vinyl Chloride Acetate Copolymer9 Implants in rats gave formation of tumors only at the site of implantation. For the most part, toxicological studies of chemicals related to vinyl chloride have been limited to acute studies with only minor emphasis on long term or carcinogenic effects. When carcinogenic studies were undertaken they were, in qeneral. of insufficient exposure duration or involved too limited a number of animals to provide conclusive negative results in this regard. 7 . ucc 011836 DRAFT DO NOT QUOii.' OR arc 7.jf.^ Other Carcinogens in Polluted Community Air - The array of contaminants identified in polluted community air in cludes other chemical and physical agents which are either proven or highly suspect carcinogenic hazards such as polycyclic aromatic hydrocarbons, azaheterocyclic hydrocarbons, certain metal compounds, asbestos and certain radionuclides.. However, very few definitive studies have been con ducted to determine the contribution of these ambient pollutants to human carcinogenesis. One of the observed epidemiologic characteristics of the world wide increase in lung cancer is the higher incidence in urban residents. Although there are other factors which may contribute to urban and rural differences such as population density and occupational differences, an urban-rural difference in lung cancer rates persists even after correction for these factors. Additional support for a probable etiological role for ambient chemical carcinogens in lung cancer can be gained from several studies 12-14 undertaken to measure the effects of population migration on lunq cancer risk. These studies in migrants have shown that either increases or decreases in lung cancer are compatible with changes In environment. The chanaes in rates parallel the general population concentrations in the areas under study and persist after correction for cigarette smoking,although at a reduced level. Moves from high pollution to low pollution regions reduced lung cancer death rates and vice versa ^Table 7.^.2). Within the United States and the United Kingdom studies show a gradient of risk to lung cancer from low in rural to high in urban areas. Migrants from rural to urban areas in the United States appear to increase their lung cancer rates. 7. ucc 011837 r> b!J i 4 vM yI>,. I [ (ji> In a recent article, Paul Koten draws attention to certain observations on the nature of car cinogens which should be considered when initiating studies of carcinogenesis 15_ associated with air pollutants. 1. Cancer induction most frequently requires prolonged periods of exposure to carcinogenic agents. 2. Cancer can be caused by several carcinogenic agents acting in combination either in an additive, synergistic or inhibitory relation to one another. This is particularly relevant to lung cancer where a variety of ubiquitous environmental exposures to carcinogenic agents exist. 3. The action of a carcinogenic agent in lung cancer induction may be determined by the competency of the host's defenses at the anatomic, physiological and biochemical levels. Polluted com munity air contains a large variety of chemical and physical irritants, which though unable to cause cancer, facilitate the action of carcinogenic agents by attenuating or destroying the effectiveness of muco-ciliary apparatus of the lining of the lung. This facilitates deposition and retention of particles carrying carcinogenic agents. In addition, these irritants can induce changes in the epithelium (metaplasia) which may enhance the progression of changes to cancer. These irritants may alter the metabolic handling of carcinogenic agents and thereby enhance their cancer inducing potency. 4. There is evidence that at the cellular level, environmental chemical co-factors of a highly non-specific nature may work together with chemical carcinogens to increase their effectiveness. ? ; - \ UCC 011838 1HJL- t AGE ADJUSTED DEATH RATES FROM LUNG CANCER IN GREAT BRITAIN, NORWAY, AND THE UNITED STATES ' PoDulation Group Great Britain residents Great Britain born U. S. residents Norway residents Norway born U, S. residents Native U. S. residents Lung Cancer Death Rate (Per 100,000 Persons) Males Females 151.2 19.3 93.7 11.5 30.5 5.6 47.5 10.7 72.2 9.8 ucc 011839 It would be wrong to consider vinyl chloride as an isolated situation, but rather It should be viewed as an example of just one of many potential chemical carcinogens which may be present but as yet unidentified as carcino gens. This suggests that more-Attention be given to the detection of other chemical carcinogens In the myriad of Industrial chemicals to which the general population is exposed either as Individual compounds or as multiple exposures. 7/ ucc 011840 / 7.4if REFERENCES _ draft 00 NOT quote or cite 1. Chemical Economics Handbook, Chemical Information Services, Stanford Research Institute, Menlo Park, Calif., 1967 and additions. 2. Synthetic Organic Chemicals, United States Production and Sales, 1969 U.,5.'Tariff Commission Publication 412, Washington, D.C., U. S. Government Printing Office, 1971, . 206. 3. Hartwell, J. L., Survey of Compounds which have been Tested for Car cinogenic Activity, 2nd ed., U. S. Public Health Service, Bethesda, Md. Publication Number (NIH) 73-35 or PHS149, Reprinted 1963. 4. Ib`1d * Original publication, p. 44; Supplement I, pp 65-66; Supple ment II, p. 96; and 1961-1967 Volume, Section I, p. 351. 5. Ibid , Supplement I, p. 61. 6. Ibid , Supplement I, p. 67;Supplement II,p. 89; and 1961-1967 Volume, Section I, pp 199-200. 7. laid , 1968-1969 Volume, p. 98. 8. Ibid- , Original Publication, p. 41;Supplement II, p. 88; 1961-1967 Volume Section I, pp 352-354. 9. Ibid 1 , 1961-1967 Volume, Section II, p 1851-1853. 10. Kotin, P., and H. L. Falk "Jtie Role and Action of Environmental Agents in the Pathogenesis of Lung Cancer," Air Pollutants. Cancer 12: 147-163, 1959. 11. Kotin, P. and H. L. Falk. "Atmospheric Factors in Pathogenesis of Lung Cancer," Advances in Cancer Research 7: 475-514 1963 12. Haenszel, W. Cancer Mortality among the Foreign-born in the U. S. Journal of the National Cancer Institute 26: 37-132, 1961. 13. Haenszel, W., S. C. Marcus and G. G. Zimmerer. "Cancer Morbidity in Urban and Rural Iowa. . Public Health Monograph 37, Public Health Service Publication 462, Washington, D.C. U. S. Government Printing Office, 1956 85 pp. 14. Reid, D. C., J. Cornfield, R. D. Markush, D. Seigel, E. Pedersen, and W. Haenszel. Studies of Disease Among Migrants and Native Populations in Great Britain, Norway and the United States. Ill Prevalence of n ucc 011841 Cardiorespiratory Symptoms among Migrants and Native-born in the U. S. National Cancer Institute Monog. 19: 321-346, 1966. 15. Kotin, Paul. "Mutagenic and Carcinogenic Problems Associated with Air Pollutants Proceedings of the Conference on Health Effects of Air Pollutants. U. S. Govt. Printing Office Serial No. 9395 November 1973 ,, pp 603-617. / / 8 CONTROL TECHNOLOGY AND REMEDIAL ACT! 8.1 INTRODUCTION Most of the presently used or available technologies are a basic, na-rt r>^ processing system and serve to recover reactant or product. These controls are appraised herein using performance data from the manufacturing plants, or by comparing emission levels for plants with and without controls. Controls so appraised for VCM production include: recycling of vent streams, condensation with refrigeration, adsorption with carbon. Incineration, oxidation with ozone, absorption (scrubbing), and venting to flares. Monomer loading and unloading involves special addi tional controls: vapor collection adapters with recycling, thermal level detectors with recycling, and magnetic gages. Polymer production can possibly benefit from consideration of controls indicated for the monomer production, plus vacuum stripping, steam stripping, and the recycling of carrier air streams. A qualitative assessment of the potential applications of selected controls has been made based upon information presented to date by U.S. industrial firms. The results of this assessment are summarized for each process in the following paragraphs. All percent reductions of emissions are estimates. 8.2 MONOMER PRODUCTION The relatively scarce data seem to point to a present total emission of about 90 kg/million kg of VCM produced. To this amount should be added a smaller, intermittent loss of VCM in the loading area. ,/ ucc 011843 / 2- - D0 N0T 0>WE OR CITE A 90 oercent reduction can be obtained by refrigeration chloride in the vents by and/or absorption of vinyl appropriate solvents (EDC for instance) anc^ by combustion of the organics in other vent streams, followed by removal of K' 1 produced. A 90 percent reduction is about at the limit of present-day technology. For such a reduction the loading area must be policed for vent losses. 8.2.1 VCM From Acetylene and HC1 The reactor vent is the main emissions source, accounting for 60 percent of total emissions. Condensation at 44 UC (40 UF) and 0.29 X 10"N/mJ(35 I'sig) is now usci \ddition of refrigeration would decrease emissions by about 50 percent. If an rn scrubber were also used, the combined controls should achieve 85 percent reduction. ^Thyse, combined with carbon adsorption, should reduce emissions 99 percent. - g*C. Recycling, incineration, oxldAtlon with ozone, and venting to flares do not appear to be applicable. Fugitive emissions equal about 25 percent of total emissions. Use of diaphragm valves, replacement of packed pump seals with pressurized mechan ical seals, use of vapor collectors on samplers, and preventive maintenance can be expected to reduce these emissions by 50 to 95 percent. Tank-car loading accounts for an estimated 15 percent of emissions, incineration, with HC1 recovery should .reduce condenser vent loses 99 percent. Thermal level detectors combined with vent gas refrigeration and/or recycling wouldj reduce slip gage emissions by 95 percent. Replacing the slip gages with magnetic gages could reduce the emissions nearly 100 nerccnt. Vapor collector adapters with recycling would reduce purge losses 50 to 90 percent. Incineration should reduce loading air emissions about 90 percent. ucc 011844 DRAFT 00 NOT QUOTE OR CITE 8.2.2 VCM From Addition Reaction of Chlorine to Ethyl'etfe ij4 Air Atmospheres Followed by Dehydrochlorination Major emission sources are of VCM from the EDC light ends column vent (9-20 percent) the heavy ends tar removal column vent (18 percent), the VCM light ends column vent (10-IS percent), and tank car loading (10-20 percent)., HDC light ends column emissions could he reduced about 50 percent using refrigerated condensers and nearly 100 percent with carbon adsorption, lie cycling to a post chlorination unit would be almost 100 percent effective. Heavy ends column emissions are believed to be controllable by incinera tion (50 percent reduction), and by adsorption (close to 100 percent reduction). VCM light ends would require adsorption or oxidation with ozone, both capable of nearly 100 percent reduction. Tank car loading controls given in Section 8.2.1 would apply here also. 8.2.3 VCM From Addition Reaction of Chlorine to Ethylene in Oxygen Atmosphere should be Followed by Oeliydro'chlori'nfation Major emission sources of VCM and their controls arc believed to be essentially the same as described in 8.2.2. The use of oxygen would reduce the quantitative amounts of vent streams from the EDC product processing, and thus would of itself reduce emissions somewhat. 8.2.4 VCM From Direct Chlorination and Dehydrochlorination of Ethylene The controls are essentially the same as described in Section 8.2.2 and would have about the same range of efficiency. This process must avoid 11C1 emissions by recovering it for other usage. Incineration with IlCl-recovery by scrubbing is about 90 percent efficient for this purpose. 8.3 POLYMER PRODUCTION In the production of polyvinylchloride, present monomer losses in kg/kg of product are at least an order of magnitude higher than in the production of VCM. Most producers report about a 3 to 4 percent lower PVC production i ucc 011845 than monomer intake. DRAFT DO NOT QUOTE OS CITE Fr m some data submitted by manufacturers, 1 to 1.5 percent of PVC made is lost. A portion of this is emitted as fine parti- cuiated to the atmosphere. The actuul monomer emission is therefore in the order of 2 to 3 percent. These losses result from the batch nature of the polymerization'operation and in the filtration and in the of the polymer, if practiced. Reduction of these losses poses a more difficult if not an impossible problem. To indicate the severity of the problem, a direct reduction to 50 percent of the present level of losses seems possible, but a 90 percent reduction of the emissions in some of the existing polymer plants without process changes might be beyond present techniques at acceptable costs. However, if intensive stripping of the suspension at the end of the reaction is allowable, the 90 percent reduction might be feasible at acceptable costs. One development should be noted, namely the move to progressively bigger reaction vessels. One company has studied and is proposing use of a 45.4 m5 [(120,000 gal.) polymerization reactor compared to the present typical size reactor of 19 to 38 m3 (3,000 to 10,000 gal.) A possible emergency blowing of emissions. such a reactor might, however, lead to very high peak vaiues of vinyl chloride / --''This report has not considered the influence of VCM remain ing in the polymer. This residual monomer, sometimes present to about 1000 ppm, is mostly released during further processing and might thus create emission pro blems during tabr'.cutlon ro'.essos, articuia.'l" tno`?c involv'nq heat. 8.3.1. Suspension Polymerization Fugitive emissions throughout the process account for an estimated 45 percent of VCM emissions. The emission sources must be better defined before specific controls can be discussed. However, a good maintenance program and minor equipment modifications should reduce fugitive emissions by about 50 percent. , * ucc 011846 / -5- / DRAFT DC SOT CUCTE OH C7.I Vacuum stripping of the crude product would be 50-80 percent efficient for reducing emissions from the blend tanTTVhich-accounts for__ about 11 percent of the total emissions. Carbon adsorption would reduce this source 50 to 99 percent; condensation with refrigeration, 50 to 70 percent; incineration, 50 to 99 percent; absorption, 50 to 80 percent. Collectively, vents from the dryer, the air conveyor, the storage site, and wash water provide 35 percent of the total emissions. Vacuum stripping and absorption are expected to give 50 to 80 percent reduction md recycles tc compressors, 40 to 60 percent reduction in emissions from these sources. 8.,3.2 Emulsion Polymerization The dryer vent, air conveyor vent, site storage vent, and waste water vent appear to account collectively for about 85 percent of total emissions. Carbon adsorption, oxidation with ozone, and steam stripping could reduce these emissions by SO to 99 percent. The recycle of air streams could nc 4u to u percent efficient. Fugitive losses contribute 7 percent of the emissions; blend surge tank vents contribute another 7 percent. Vacuum stripping, if practiced would effect 50 to 80 reduction; carbon adsorption, 50 to 99 percent. Condensation with refrigeration would reduce either source about 40 to 60 percent. Absorption is expected to reduce both losses 50 to 80 percent.* Preventive maintenance would reduce fugitive losses 25 to 50 percent. The surge tank vents could be recycled giving 40 to 60 percent reduction, or they could be oxidized with J ozone to provide 50 to 99 percent reduction. --V 8.3.3 Bulk Polymerization The VCM reactor vent (25 percent) fugitive emissions (35 percent), and the combined resin receiver, collector, and storage (20 percent) are the major emission sources. For the reactor vent, adsorption (SO to 90 percent reduction), oxidation with ozone (90 percent reduction), and incineration (50 to 90 percent reduction) are indicated for control purposes. Intensive maintenance is believed to be capable of i^n- / / 6- - draft DO NOT QV 50 to 75 percent reduction of the diverse and ill-defined fugative emissions which need further study. The product collection systems vents could be waterwashed. then adsorbed (50 to 90 percent reduction), oxidized with ozone (90 percent reduction), or incinerated (50 to OO^pcrccnt reduction). 8.3.4 Solution Polymerization While no data are at present available for this process, it is expected to have the emission characteristics of the suspension process (section 8.3.1) and to respond roughly to the same controls. 8.4 RESEARCH AND DEVELOPMENT UNDERWAV Allied Chemical is developing a technique for controlling hydrocarbon emissions from the o'xychlorination process. Control of vinyl chloride is expected to be a side benefit of this work. Industrial R&D groups are investigating the use of carbon sorption and solvent scrubbing as gas stream cleaning techniques. They are also trying to develop a more porous polymer form which will facilitate stripping of the monomer from the polymer. ucc 011848 f / REFERENCES DRAFT DO NOT QUOTE OR CITE Vinyl Chloride -- Assessment of Emission Control Techniques and Costs. '' Internal EPA Report, July 1974. I7 ucc 011849 / APPENDIX A DRAFT r'*' W^ f"T .i rv',t,JOTE OR CITE ESTIMATES OF RISK FROM LOW LEVEL EXPOSURE TO CARCINOGENIC CHEMICALS Several statistical models have been developed for extending observed response associated with several exposure levels (dose-response curves) determined In experimental animals to undetermined response dosages below those used experimentally and extrapolating these theoretical considerations to estimate risk to human health with regard to low level exposures to carcinogenic agents. The estimated risk associated with exposure to vinyl chloride based upon animal experiments has been presented using several of these models and the available toxicologic dose-response dataJ Mathematical Models Models available for estimating risk associated with exposure to carcinogenic agents fall Into two main categories. I.e.those that deal with tumor Incidence as a function of dose and those that deal with latent period modification as a function of dose (exposure level). Several models designed to predict response beyond the limits of available experimental data have recently been reviewed. 2-8 Strategies for assessing risk range from those that place emphasis on safety factors and host. ci*rti*1 c ,1ud(TM"rt to those that involve 4-7 statistical extensions beyond the limits of observed response data. Among the Important factors to be considered In the use of these models are the following: rt -I ucc 011850 DRAFT DO UCT QUOTE OR CITE Any exposure to a carcinogen may be associated with a certain degree of risk. This risk is expressed with regard to a particular carcinogen. However, multiple exposures to several carcinogens and non-carcinogenic synergistic agents in general are not considered in these models. None of the available models have been adequately confirmed by direct experimental studies at the very low end of the dose-response relationship. Since these models represent extrapolations beyond the limits of available scientific data, they should not be construed as "scientific dogma." Linear models of a quantal biological response (all-or-none) are useful for selection of a mean effective dose. In estimating risk to the population, the slope of the extra polation curve and the confidence level selected for estimating risk are extremely important parameters. The intrinsic reliability of these models depends upon proper experimental design with appropriate attention given to biologic factors that may modulate response. It is extremely Important to note that linear models assume a no-threshold effect level, and the level of risk determined by the slope of the dose-response curve can be Influenced greatly by the experimental design and the selection of the model used. A 2- - ucc 011851 f r. r ' r* // DO t^f|iUI Ti r r* v-j i c These models are as valid as the assumptions made in their design; e.g, it is assumed that the distribution of sensitive, cancer prone individuals in the population / is represented by a normal (Gaussian) distribution. A committee of scientists under the direction of the National Academy of Sciences, Advisory Center for Toxicology have recently reviewed biological and statistical considerations in assessment of risk. This review soon to be published (January, 1975) is presented here for those who desire a more in-depth discussion of these matters.8 -3 ucc 011852 CHAPTER V DRAFT rc > w: Quors'CS CITE i 34 SOME BIOLOGICAL AND STATISTICAL CONSIDERATIONS IN THE ASSESSMENT OF RISK CONTENTS THE ROLE OF THE TOXICOLOGIST IN THE ASSESSMENT OF RISK ..... B. BIOLOGICAL CONSIDERATIONS...................................................................................... S. STATISTICAL CONSIDERATIONS .................................................................................. 1. Experimental Error and Sampling Error.................................... 2. Estimating Low Effect Levels ............................................. .... . > SUMMARY........................................................................................................ LITERATURE CITED.................................................................................................... 125 126 129 129 331 133 135 >** ^i`i'--.t* .i DRAFT A-4 DO NOT QUOTE CR CITE ucc 011853 / V. SOME BIOLOGICAL AN!) STATISTICAL CONSIDERATIONS IN THE ASSESSMENT OK RISK Applying the results of toxicological investigations conducted in the laboratory to the population of Interest generally involves two kinds of extrapolations. The first, which is more difficult to deal with and more Important with respect to human exposure, involves predicting the probable effects on one species from the results of experiments performed on another. The second kind of extrapolation Is that of extending dose-response curves beyond the limited range of observation to determine the dose corresponding to an extremely low incidence of adverse effects on the organism tested. A. THE ROLE OF THE TOXICOLOGIST IN THE ASSESSMENT OF RISK This report concerns itself primarily with tho task of developing objective technical information needed to make decisions on the course of action to be followed to Insure the safe use of chemicals. It does not, except for a general statement of principles, go Into the socio-political aspects of decision-making. Terns such as "toxicological insignificance," "safe," "zero tolerance," "no effect level," and negligible risk" hava been In rather common use. All of these contain In one way or another value judgments or technical impli cations which have no place In an objective assessment of risk. Thera la no substance which, under certain clreumatancas,cannot be dangerous and unsafe. There Is no battery of testa, however elaborate, which can prove beyond chal lenge the complete safety of a chemical. For the toxicologist to apply tha terms "toxleologlcally insignificant" or "negligible risk" to e set of obser vations makea a premature Judgment In the wrong arena by tho wrong parson as to Insignificance or acceptability. terms from this report. An attempt has been made to eliminate such i ***** '' An 1 ucc 011854 1 DRAFT DO NOT QUOTE OR CITE Another common term of wide usage is the "no effect level." This Is statistically meaningless and therefore of limited value since it merely means that no effect was observed in studies using a group of animals of particular size. Such an observation is completely compatible with the pre sence of an adverse effect, which in further studies with larger sample sizes or with different types of observation might lead to a positive outcome. We pref r the usage of the term "no observed effect," which should always carry with It a qualifying statement sb to size of the group in which no adverse effect was observed. In most instances it will be imperative to develop a dose-response relationship, and because many toxicological techniques are relatively insen sitive, high doses (which produce high incidence of effects) are frequently required. These can be and have been called "unrealistic" or "inappropriate." Such exposures may be well above, sometimes many orders of magnitude above, likely levels of exposures to human or wildlife systems. Nevertheless, they are often an essential part of practicable laboratory studies which necessarily use limited numbers of animals. The underlying challenge to the toxicologist is to use these points on the dose-response curve as e means of quantifying responses, and to devise, with suitable margins of safety, appropriate means for extrapolating to realistic, actual exposure conditions. The biological aspects of this extrapolation will be discussed first, and the statistical considerations will be developed later. D. BIOLOGICAL CONSIDERATIONS For clArity in the following, it will be assumed that we are con cerned with extrapolation from the laboratory situation to human populations. on ? Vt < ''* ucc 011855 r r ,,n DRafT f'0T Quote or Except in the case of lifesaving drugs, only very low risks will normally be accepted in chemical usage. The acceptable risk will, however, vary with the benefit anticipated. In the case of risk of death from a chemical of trivial /' utility, the acceptable risk would be essentially zero. Put in explicit terms, this might mean 1 death in 100 million persons. As noted in the secLion on statistics below, extrapolation to such risk levels from experiments on small numbers of animals is extremely uncertain. Again, and as noted repeatedly in this report, the gravity of the effect is a major determinant in an overall assessment of risk. At one extreme lies a fatal outcome, and at the other, a temporary functional alteration producing no disability or discomfort and lying fully within the range of physiological compensation. The susceptibility of human populations varies widely since genetic background, age, prior or co existent disease are all important determinants, and part of the toxicologist's task is to identify susceptible groups in the population as the basis for estab lishing limits of exposure. Another and vital factor constantly facing the toxicologist is the often striking biological differences between the effects of chemicals on labora tory species and on man. It has been repeatedly shown that no one species (including non-human primates) has responses parallel to the human over a wide range of the effects of chemicals. The choice of species must then be based on a determination of the biological similarity in the responses to the chemical under study. In extrapolating from animals to man the transfer is often made on a dose.per unit weight (milligram per kilogram) basis. This practice overlooks the well demonstrated (Freirelch et al., 1966) observation that dose per unit surface area (mg/m2) is generally a better transfer parameter. A-n ucc 011856 / D"^mVcHlTE t There has been much loose Calk abouc "thresholds." The term threshold means "the entrance or beginning point of something." This implies (and is normally so used) a discontinuity in the slope of the dose-response curve. True y discontinuities in biological phenomena are..rare. However, they do occur. One example is the threshold for glucose excretion by the kidney. Most biological dose-response relationships appear to be smooth functions and in absence of con crete evidence dose-response curves should probably be assumed to be smooth. Many dose-response curves have an "S" shape with a much lower slope at the low end of the curve than in the mid-range. This could be regarded as a "quasi" thres hold. The steepness of the dose-response curve is an important consideration for predictive purposes. A steep dose-response curve Implies a sharp cutoff (again, a "quasi" threshold) with decreasing dosage. Some dose-response curves appear to be linear, especially when atten tion Is limited to relatively low incidence rates. One example of this is cigarette smoking and lung cancer (Doll, 1967); there are many experimental situation where this appears to be the case. Despite the above comments, there are some biological reasons for anticipating that with some chemical agents there may be something approximating a true threshold. The biological basis for this is twofold: (1) the possibility of a relatively greater effectiveness of repair mechanisms at low dose levels; and (2) the possible presence of competing biochemical processes which could convert tha chemical to harmless products at low dose levels. It is difficult to generalize on these mechanisms since they can be expected to depend on the chemical and the species. Unfortunately, investiga tion of these questions has rarely been undertaken. r< r DRAFT DO NOT QUOTE OR CITE 111 the past, these complex consideration.'; have been dealt with pr.ij',matlcally by ihe use of arbitrary "safety factors." C. STATISTICAL CONSIDERATIONS The need for a proper consideration of statistics in the design of toxicological experiments and in the interpretation of the results cannot be overemphasized. First, before meaningful results can be obtained, attention must be given to identifying and reckoning with possible sources of error. Second, statistical techniques are available which can give meaningful esti mates of the level of exposure to chemicals corresponding to the level of risk which the decision-maker considers acceptable. 1. Experimental Error and Sampling Error The outcome of an experiment is normally dependent upon innumerable factors, only some of which are known and even fewer of which are controllable. In dose-response experiments with animals, for example, some identifiable factors influencing the outcome include (1) the composition of the particular batch of test preparation, which typically represents a significant source of variation in independent repetitions of the experiment, (2) animal variability, (3) technician reliability, and (A) the precision of laboratory techniques such as dilution techniques or dose preparation. Since such factors influence the dose-response relationship, they represent sources of experimental error-, and hence independent replications which randomly sample the levels of these factors are necessary in order r nn l\fnr t\\ r-'V. r:--r U\J {\ V.1 ; A w ... . . .. . . ... ' #h. ... .. . ucc 011858 / DRAFT QUO a Of" CITE to estimate their contributions in the measure of experimental error. If :;o major sources of variations are not considered in such replication, then sta tistical precision as reflected in the width_of confidence intervals, for example, may be grossly misleading. When several major sources of experimental error can be identified, a conceptually simple experimental design would consist of independent repli cates at each target dose level randomly sampled with respect to all sources of variation. If batches from the chemical manufacturer represent a source of variation, for example, then this design might assign each animal at each dose level to a different batch of chemical from the manufacturer.' If dilution errors are non-negligible, then dilutions to target dose should be independent, not nly among dose levels but also among animals within dose levels. When several such sources of errors exist, this conceptually simple, completely randomized experimental design clearly becomes impracticable, and blocking becomes a more feasible means of conducting the experiment. Titus, each batch of the chemical from the manufacturer might be administered to a group of animals at every test dose to produce, in effect, a separate dose-response curve for each batch. For any one batch, the proportion of animals responding at a given test dose is subject to sampling error due to such factors as animal differences and possible errors in dilution which would result in each animal r ceiving a slightly different test dose. At any given dose level, the pro portion responding also varies among batches; thus, the average proportion responding at a dose level is subject to both sources of error, namely, the sampling error within batches and the variability among batches, which together comprise experimental error. A valid statistical analysis should utilize the appropriate experimental error and not merely its sampling error component, i> r\ a m / * t ucc 011859 draft WOT QUOTE on 1 Since standard statistical methods of bloassay often are addressed only to the analysis of sampling error, there is need for caution in applying these methods. 2. Estimating Low Effect bevels Estimation of low effect levels poses a difficult problem. Direct experimental estimation of the level affecting one percent of the population may require several hundred animals to obtain adequate statistical precision. For many reasons, particularly in human populations, much lower risks than one percent are desired. A true no-effeet level cannot be observed experimentally. Any observed level has meaning only for a particular sample size. The observation of no-effect for a group of animals may arise from one of two reasons: (1) the dosage level may indeed be below the theoretical no-effect level; or (2) the number of animals tested may have been inadequate to give a high enough probability of detecting a biologically important change. For example, a test on 20 animals may show no deleterious effect, but a test on 100 animals, tested under the same conditions, may show one or more animals exhibiting deleterious effects. Similarly, for a graded response, a small sample may fail to provide enough statistical precision to detect a change from baseline, whereas a larger sample may. Thus, an observed "no effect level" has no absolute meaning since it depends on sample size and poorly estimates the theoretical "no-effect level";a better term would be the "no observed .effect level." However, data from experiments in which no effects arc observed are useful in placing limits on the probable incidence of effects. For example, if no animals out of 100 animals displayed a deleterious effect, it can be stated with 99Z confidence that fewer than 4,5% of animals tested under these conditions h! H M * r ucc 011860 / , DRAFT CO ROT QUOTE 00 CITE i:v: would exhibit deleterious effects. If this level of risk is coo high, more animals can be tested. For example, observance of zero animals affected out of 1000 tested results In an upper `>97. confidence limit of only 0.46%. To reach an cxtrcmly low acceptable risk level''in--thi s manner generally requires a prohibitively large number of animals. The past practice of selecting some arbitrary fraction ol "no effect level" as a limit for exposure leaves one with no estimate of risk. However, a fairly conservative estimate of the risk can be made by employing the one-hit (one-particle) theory (Food and Drug Administration Advisory Committee on Protocols for Safety Evaluation, 1971). This theory states that for low dosages, if an experimental dosage is divided by a factor f, then its upper confidence level of the risk is also divided by the factor f. Such an approach will often result in near-zero dosages for extremly small accept*'*'lu risks. For example, If zero deleterious responses were observed in 430 animals at a dose d, It can be stated with 99% confidence that the true response rate is less than 1% (one out of 100). The predicted dose for risk of -4 one out of 1,000,000 would then be 10 d. An alternate means of estimating low risk exposure levels involves extrapolation from parametric dose-reaponse curves. Many different empirical mathematical models may be fitted to a set of experimental data (Finney, 1964 ). The problt and' logistic curves have been commonly used In biology, for example, and both curves may fit equally well in the region of experimental observations (2% to 98% response range) but give widely different estimates for extapolated responses. For example, the probit curve will predict a dosage level approximately 140 times higher then the logistic curve for extrapolation to s dosage expected to elicit one response in 1,000,000 animals. In some Instances H- II ucc 011861 DRAFT DO MOT QUOTE OR CITE ! . < t (Doll, 1967) linear dose-response curves have been reported; often, however, these cover only a relatively limited response range. S There Is no assurance that the dose-response curve observed in the experimental range of dosages will apply at extremely low response levels. Mantel and Bryan (1961) suggest the use of a presumably conservative slope of one problt for each factor of 10 In dosage level for extrapolating to low levels of carcinogenic risk. A more recent approach to the extrapolation of laboratory findings to the establishment of standards or limits for human populations (Albert and Altshuler, 197 3) has taken into account age at the time of the appearance of the adverse effects as well as the frequency of Its occurrence. In the case of cancer from external sources, for example. It has been shown, both experimentally and In humans, that with lower doses cancer appears later, that Is, at increasing ages* Under this concept, and assuming the availability of reliable data. It should be possible to establish limits which would place the earliest occurrence of malignancy at an advanced age, e.g., no more than 10% incremental likelihood of cancer at age 95. D. SUMMARY In the past, toxicologists have not only made the laboratory assessments of toxicity, but in many instances they have made the final judgment as to the social course to be taken on the basis of a particular.set of findings. Instead, the technical experts should be charged with securing an objective independent determination of the extent, naLure, and frequency of adverse effects. They should be asked to explain the relative gravity of these effects for the target w iTi ^ i ucc 011862 m. ^ (7i iM system, be it humans or wildlife. Similarly, other qualified technical experts should be requested to make an objective assessment of the benefits of use and of alternative materials or processes. However, the final judgment as to a trade-off between an adverse health effect and a desired benefit is a social decision and should be made with the participation of those who are affected. This is not to say that technical experts using their technical expertise will not participate, but it does state that they should not be the sole judges of determining the balance between the benefit and the risk. The dose-response curve Is a valuable tool for assessing the safety of a chemical compound. Estimates of low effect levels are part of the information leading to the ultimate designation of safe and acceptable levels. The statis tical problems of extrapolation from experimental dose levels to very low levels and the estimation of appropriate errors are particularly troublesome but can b handled if care is taken in the dealgn and analysis of the experiments and the interpretation of results. Without supporting experimental evidence, however, statistical analysis will never be capable of making the critical extrapolation from laboratory animals to man. * A-v* ucc 011863 LITERATURE CITED DRAFT 20 NOT QUOTE OR CITE Albert, R.E., and B. Altshuler. 1973. Considerations Relating to tluFormulation of Limits for Unavoidable Population Exposures to Environ mental Carcinogens, pp. 233-253. In C.L. Sanders, R.ll. Busch, ,|.K. Ballou, and D.D. Mahlum, Eds. Radionuclide CareinoKunests. I'roc. 12Mi Ann. Hanford Biology Syinp. AEC Symp. Scr. #29 C0NF-720505. National Technical Information Service, Springfield, Va. Doll, R. 1967. Prevention of Cancer: Pointers from Epidemiology. Nuffield Provincial Hospitals Trust, London, 144 p. Finney, D.J, 1964. Statistical Method in Biological Assay. 2nd Ed. Hafner Pub. Co., New York, 668 p. Food and Drug Administration Advisory Committee on Protocols for Safety Evaluation. 1971. Panel on Carcinogenesis report on cancer testing in the safety evaluation of food additives and pesticides. Toxicol. AppI. Pharmacol. 20:419-438. Freireich, E.J., E.A. Cehan, D.P. Kali, L.H. Schmidt, and H.E. Skipper. 1966. Quantitative comparison of toxicity of anticancer agents in mouse, rat, hamster, dog, monkey, and man. Cancer Chemotherap. Rep. 50:219-244. Mantel, N., and W.R, Bryan, 1961. "Safety" testing of carcinogenic agents. J. Nat. Cancer Inst. 27:455-470. A->5 UCC 011864 / references 1. Schneiderman, M.A. Mouse to Man-Extrapolation of Laboratory Results to Human Disease. Presented to: The Working Group on The Toxicity of Vinyl Chloride - Polyvinyl Chloride. The New York Academy of Sciences, New York, New York., May, 1974. 2. Weil, C. S. Statistics vs. Safety Factors and Scientific Judgement in Evaluation of Safety for Man. Tox. Appl. Pharm. 21:454-463, 1972. 3. Weil, C.S., Guidelines for Experiments to Predict the Degree of Safety of a Material for Man. Tox. Appl. Pharm. 21_: 194-199, 1972. 4. Food and Drug Administration Advisory Committee on Protocols for Safety Evaluation; Panel on Carcinogenesis Report On Cancer Testing in the Safety Evaluation of Food Additives and Pesticides. Tox. and Appl. Pharm. 20:419-438, 1971. 5. Symposium on the Evaluation of the Safety of Food Additives and Chemical Residues. Tox. Appl. Pharm. 16:495-520, 1970. 6. The Effects on Population Exposure to Low LEvels of Ionizing Radiation (Bier Report), In: The Report of the Advisory Comnittee of the Biological Effects of Ionizing Radiation. National Academy of Sciences, National Research Council, Washington, D. C. U. S. Government Printing Office, Publication No. 0-489-797. 1972. 7. Interim Report on Extrapolation of Risk of Cancer from Animal Data Comnittee to coordinate toxicology and Related Programs. Department of Health, Education, and Welfare. Personnel Communication. May, 1974. 8. From Principles for Evaluating Chemicals in the Environment. A report of the Committee for the Working Conference on Principles of Protocols for Evaluating Chemicals in the Environment: Environmental Studies Board, National Academy of Sciences - National Academy of ucc 011865 1 / DRAFT DO NOT QUOTE OR CITE Engineering, and Committee on Toxicology, National Research Council. Washington, D. C. Chapter 5, 124-133, In Press (January, 1975). An ucc 011866 APPENDIX II THE HEALTH EFFECTS OF VINYL CHLORIDE A Compilation of Toxicologic, Clinical, and Epidemiologic Data / ucc 011867 DO NOT QUOTE OR CITE ucc 011868 Sutlers Sccdes Von Cettingen H,,--in 0955) later aecca-!).idv ''anta M9:2) Ihen.Abstract His>an .aster ireer.berg :d*-$ , 1S33) Hunan (labor Hadu Freda ASru dean Juanof Anca Valczkay 0964} Cheri.AtStra Hunn Srlgorescu To be (1SE6) aen .Abstract; Hu* an vi cf rr':c'L:'`.::AL c-;a Hu->n Tata Hrs,. car lav i Cone Observances Pabclccv Il2.c:3 1C.KC B5.CC3 l , C*rcrc-_s "'CCS'S Produced s>-ctc-s of dizzlress, disorientation, haedac*e e'd iur-irg ser.satlc't cn solss of fest. 82 e<er : e*:m- to ;i;cd; Decrease In catalase Bar.iane, bcxcchlcrpcyclc- * Increase fn peroxidase, indcphenoloxidase hexan . VC.!ciC end glutf-athlcne Here reported Changes occurred during second year of work wice oer (fcy: 0 far 3 daysj- 4,C!3i Bin S.ClC sessions at ii2,c:c 6 bcur; ie,oc: Intervals |2.0.003 418.7 1/e slic*-ily dizzy C/fi bad t'/ e*fects 1'S slic-dy d'zzy 2/5 ce'idtely dizzy s': d'cc.-, ra-sea, blurred vlslcn and heaving s>T-:*.:-s stcccad after exocsure 8/5 'r::*-ciCed, e^e v-ith persistant headaches SCT level s' re effect Is 1.3', No state-ert abcut repeated ex;:su-es 78 FVC Werners < Decrease c'*s-* altj-ln [ Increased ^a-d /''clciul in i Dec-ease ir^Z/fcr sere- lipccrotiairs (Decrease ir, Asr- e'olireste-ese Oec-ease in pse.de cholinesterase ficr-I tlccd catalase l;or-a' seru-" pyruvic acid Nona reported Ncne reported Experfrental!: PVCj Workers r-..cot-es<s: VC*a;>0 ^chleral + chloracetic acid (1) Control: Cther cljnically .tes.Its: (1) -as found in 85t of exptl. people, tut health/ people In r;-e o* cc-trols. 3f*as: o* * firdircs ware In pecole excised 2-5 years, jin these cases,^ - globulin is higher,/^ globulin ' is lce- than people with no (1) In urine. ! Capacity to reieiolize (1) decreased after 2 years. None reported * \. ``/l -4 * i .. I 'J it' TS ,rrfs :sr s 967} Ison Corrtick tin -ech 967) Soecles Sex Hur.an Hunan M EiPOSIP.E Hrs, Iota per Cone. Casi Vj, flay ` 0; .-s - pcr-C: 2m _ 31 * - > > -eeta ewart tchler 163} Hunan M 13 7.5 1 50 15,6 253 78.1 4 - 500 155.2 fryiutseva 70} :tract Hunan H r 50 . 43 _ :1a .70) .ubltshed i Human 1 8 1035 5 8 /1825 15 500* l t In several other factories CF TOUCGLi'jrCAL CATA Hui-an Data Z Observations Pathology % One worker bad knee cap and toes '. Involved In the acre-osteolysis, 1 Other worker only hands. ho cases cr acro-osteolysis diacncsed in TCHO individuals who handled finished resin or used for clastic product production. 31/3CC0 (31J work-en associated VC polyrerlzaticn found to have aeroosteolysis. Ape rarae of affected workers 26-47. Incubation period c-este' than 12 rorths o? polycleanin? experience. 22/31 Aero-osteolysis associated with Raynaud's sy-ptc.-s. Breath decay curves, 0 to 20 hrs. after exposure were -easured. Level in breath at a hrs. is 15. ho adverse effects noted. About the sa~e set eoxfpborseuareth. decay curves following occupational Hone reported. 1. Charges in ECG: rhythm, conductance, polarization. Here reported. 2. Increase In systolic index. Ocro-osteclysis syraters, Reynacd's Syndrc-e, aversion to fats, enlarged liver Raynaud's syr.drcre Enlarged liver, minor liver insufficiency. ' 13/5C3 had acro-osteolysis. Olefactcry tires! is O.B to II. Acute nervous sytptc-s fcec;-e evident when it is easily perceptible. Aercretry: &CJ on factory filters at air discharge tire: 2.0CC pc" (yC] at point of worker e-try: 2.CCC ppm in plants wcera ac-costeolysfs occurred - 1:3 ;cr , (max) in plant wit-; re disease L<'Cj cn gangway and otter parts of plant; 10 to 15 pen. - ' --- ' MwOv > r-r* O Cj ' - 1 2- :- -C3 c-------- a: ^CT cS 5CT-- ucc 011869 / ucc 011870 1 3 Olnrjn Cook * Naterfauia 'C'luton nitch-eck (m Ocdscn oinran Uhltfouse Mlr Menu ion Krwer utchler {WIJ 1. swr.w r.rfa!.r',mi:c:r-.kl '`..r`.:r.u r- ] jOtiervit,|;p| '3I 'crditicrs atsnc'lted with hand cleani of tali-e-ideri. E There aa:sred to he earrelatfcn het-een reactor jdMiitla: :ir* and acro-eatealyits. Ut csc'e-ts had uarVed is P\C reactc--/isat elea-ers- 1*3. C* and * hala-ct In one lutiect. Plethrs-;:riphic arrival t tits were oresent to J sutiects. r$3c*a:ril fatuity within os'-it 11-tlti. Citif-ti-lrf , -fa.trjiyir-iste Acetic Add eac'etler r:r-|l. Alt ::-e- m.-ercct clinic*t lateratcry tr.eestljatlcni reniti/e. __________ Pathclco*_____________ -_________ H cisei e* acra-asteol/siv It other Ir.lntiaili tautlwstli, Acro-CIteotysil epceirs to te tyttewlc rather thin loot diicjse. Ae/raud'l phenc-e-en wf statistically related to icro-osteol/sis. dej-i-.d`i pne'c-mon anteceded osttolytic leiicns In all four lubjecti. *'f scintiscan correlated with radio* ornMc testers. No Mer enlarcerant or hy;othyrctdlsr. Additional trailer atncr-jUtfei fac'd In ulnar styloid, oicatcli ar.d patella. Pe'fomed ttat'ttlcal earrelatlc" hetnes* it/e'sl clinical -tiiu'e-e-ts *"3 total ioie t'd t`-e* welshted aeera;* '.'C ccrcartratlo. None reported. Z lt*er fu"ctlcn l"iHeei show a tosltlea correlation with total d;ie (ih"0i--jll hloh). a) Icterus fn-'ea b) 3rrrsjtr`,al*tn 3 otfar trdices are <faie*rclited tut are not Collide nomat Units: a) systolic and diastolic bleed pressure. b) hercjlcbln nrjatlee correlation. c) teta-pratlin. Vf. t t I ucc 011871 thars >erson ier m) Jtract 'fcowitz -'ona Id :hiere -mer m) ;tract e 3* .in Wan 73) HUJWiS Species Sea h'o. Hrs/Viy Pi/s Homan -I EXPCSMc Cc-c. F'-i. *\ Cf TCXECCLOSICAL DATA . W-'Wi CATA Total Esse prm-days 08SFBVArrC.`.S Human Hunan 13 Ages 29-52 Reactor cleaners 2-18 yrs. employment {. i :;Dl I I* I 4.r- - *> ____________ PATKOlCGT Acroosteolysls Had unique popular skin lesions which have teen described only In PVC workers Describes acrcosteolysis ' pymptoms. Incidence ts<3S among workers Latent period: I'j-Ti yeirs In 11 patients', 7 and 11 years In other 2 patients, - Acro-osteolysis symptsms. , Peripheral vessal *rv1s. 'Direrbcpeny (lew c:.ni,* is the first objective symptom described in all patients; lung fibrosis or*nin*t*r7 + portal system, l*-;3 tplecr. Impaired Jung function; I IDS mortality. This Is the ; first objective symptom - - --described- -- --------- steller tacb ter e ie *er tran m > Huxan surr Hu~an data ca;a EXPOSE E hrs. Total j Se< K;, per r*v : Cone. Ccse: Cf VS i *r-* oom-Pjvs! Cbservstfors 120 1*1 to 21 years 20 P7C workers here studied out of 45 with suspected skin prcble-.s, because and possible t.n perfom laparoscopy on 20. 30 to So years old. 1' Fathclccv Liver enlarged In 13/20. Pair, in 9t. upcer atic-en In 2/20. Hyperlipideria has been diagnosed In 1967 after 6 years In 1/20. Jaundice history in 19=5 before exposure in 1953, liver dysfunction wi diaqnosed, np alcoholism. Spleenc~esaly in 7/2C. Total bilirubin was>l rg/100 (which Is upoer nomal HrltJ In 3/20. 8ror.su!phalefr test was abnormal in 19/20 (>5S retenttcn after <5 Minutes). S6!T was > 12 rtl/rl In 17/20. SGPT was elevated (15-30) In 14/20. Alkaline phosrhataa* as>43 uij/rl In 2/2 Hypothror.bocytenia (flaCxl'l-Vnr:3) was found l!)/20. (OC0*lu"/u.it>) in 12/ Icro-ostyeolysis *as seen In 4/20. Vertcose veins of escc^asus In 3/20. Liver histology: Collagen tran.sfcrr.stlon of walls of sinusoids In 5/;;. Focal activation of Kupfer celts in 9/5 Focal fatty Infiltration In 14/20. Fibrosis of septa and caosule Intralobular and portal spaces In 17/2(1. IS additional bicod twra-eters were ' nonra!. 9 Icnunological tests were done once, not repeated. *,1 i;: i i *; li in M -.H' -I..... ,TVV - - * f - *- , . !s ". -t t * t* '* *-J{ *'J- s'''-'V _ 1 - '7. : S **"-v ; r' a -< i -, j . * ' ' * * ` > - * i *** . 4*r.>-l->, *1 '' . ***+ j1.! : / ' t* ** '.* *: * ti I** ^ - NOT QUOTEORCITE ucc 011872 -T'-fTP' r i', .rr"-' Cf 7- MWL S J;lj See *0. Hrt/djy da'/i Von Cettfrcen i'SSSJ (See lew Article) Ci*.; Citt S3 NO NO NO NO ' <1 NO. t Ci:j NO N3 <4 1 Oram Cone. pr-? AM*SL Total Sott t?--1i .1 NO NO . ^ I.7C3 1C0.CC0 to no.cco tec.cco < I0.CC3 . C!if4triC%S PATHJLC3T VC 1l pre-ptty titrated by krjij tfttr tnhalatfcn itept It aUMnated Stood VC concentration ratchet 1S-17 rgt ` ' 1' TNH concertratlcn cautei Itrt intra-auricular prenure reduction at 11.030 fpn dlchloreetn.lene, 10.CC0 ppm ether Citt Ca*t Cats N3 NO NO NO <4 4 __ - NS NO NO 1 t __ f NO ICO.CtO *K.!SI to JOO.CCO NO libblu ND NO lain. 1 I70.CC0 Cejt sc,tea NO ns Cariltc IntufMcU-e/ * E*en tbit d:et rot product cc-plete cardtat failure Hood Itvels ir <10 it tfr< of cirdlic arrttt. 27*30 9$* it tin of riiplntcr^ arrttt * Thlt It the narcotic coneentrettcn * *' * . . 1L - *a . Met Dost Cc$f NO NO 1 atn. 1 W.CCO to UJ.CCO NO NO < 4 1 10C.CC0 NO NO 1 7 for tenr- al ell 10.CC0 Oogi NO Met NO 6. fist NO NO 1 NO, 10 atn. / NO Itort / tin 7 for 7C0,C:0 texeret all 1 245,CC3 to * 2,cco 1 2C0.CC3 to 400,CCO so to es <12,CC3 47S J.5C0 1.7C3 to 1.00 NO Thtt It Use narcotic concentration Cardiac Irregular!tlet, ECS abnomllttai Ns aajor change In Hear or Hdr.ty Barked nitration, rcnftlej, retpireicr/ areait Thll It thi lethal r*n;t for 10 alnutet nepotart Ml Hit*4 Y-r. r*' t L Il. . r-- -* * . v- i .I v,o* l > 1 ^ : -.. i * : - ^'s ?;' Sf J .... ^ C . */ *.ob i t- Vo CT3 ucc 011873 t. * i*.-- |^ .. yw . f r>*\rr *.r L' fi yT.J ..., ,. Si ; r #* * - < -- - *- ^ "*> 1 ^ ' *' m * * * I . * ""2 -r f+ i # -*.. . ; . [ Von Oattingen, W. F,f H.D/ the halogenated aliphatic, olefinic, p T Tr J* *a / m ' * * cyclic, aromatic, and aliphatic-aromatic hydrocarbons including the *?"?*"? "halogenated in8ccticidc3,'``thcif"t'o')tinty`and potential dangers. Public -----* - * Health Service Publication Mo. 414, U. S. Department of Health, Education, ---wH*--and Welfare, Washington,* D<-C.--1955v --- -- .rf **%! } . # *4 - --.i . ... r. a 6 "m U h .<W- O.Aa* * K 4iLp *' v ^^ c___. ;_ Wilson, R. H., W. E. McCormick, C._F. Tatum, and J. L. Creech. . * . Occupational Aerooateolysia, report of 31 cases. The Journal of the ' ~ American Medical Association, Volume^201, Ho. 8, pp. 577-581. 1967. +* ..... * . , ;fjgi*;r~-.il-r-yrf*'-r;^- j-r.*^4.. ' ` + **---'*hk TM -f*. - ` * y !| 1 1. f , i( *. , , 1 . _ Ill nr t--r, ` ~ ~"i--- ^ |=> *TUf> hwimhi iw *<***** .* t , , 1 , , a ^ 4 ,a> <ti| * k * > ` ' j " * t a * r ** -*_--1 ` "V . -- * ;j ..*** i ~V 1, ^ ! a i *; j . y ^ " *" - J : V]i "`k V *at(bkke '> .hv-.PV y<-' .... --' V . - . '* 1. '%.*.a- 1* * *u* - ; * . j ^' *. .4 ** " . , 'V,, * `4 * , * v^ * --.14---. w.w 's. n*'".. - tr."*ta- . aa -j-.*r*Jr. ^--,%*%r.-?!--r'.. .. ---- -1iV.yJy--4xfi: y, H * - * * -- A*m . f*r.--. . ,:v:. v-vJ (.ifVH' **M-'*.*f f ' *. .. ^f *'*. -i- Jlli' m u, n t. ..! n iMil-ll . f . . " *, < *5 * li" 7 + ri ^ '*. ll. / ` *h4 ` * ; ` * i. * 1. /.**:. - 4 f, f-* ..*. t -- >**.' .**.'*. '* - ^ '***. -*' :...-..t. ; *s W.-.i Sk k q-S*vi " ft --- - _m--|'r " v **'. * *<+\' J-*, * --M lAhM HI >y/ rm%sK MUi^m* si I.M^4 i* ` ^ H A" 1 rn !!*>*p.*^\**t^* 4 A* . , k` ,* , . . fc * . *' > ' - -* -TMvt * .* ' ^ *-r 4*V ^"'.n * * . * 'r< * *, * *- w * **? f , J* 1 4 * i - -*-.. . >#* j .,.4 .. if * '** , *'. x r y.*^>*y`.'T7*'':*;rt^,ir-f'. ,, -5! \"VtZT.gt~~--''- +' ' .. ' `-'hi w* -- ( * i > .--.i ?[ irf ^ ..' * -rt... '.' ' !'J fi. '. ' * '. . !.* `ifi**- : "r* ' t -. ... ' -. rfy/v J> l-iji r ., -- f..f.T..,..*./.-; . fw-USA-"*T rlraM J ll^ | .' 1 Jfr- . * 4 - ,rfa,svrt t. '.............. j/vs` - . . ..J i ' .. M J * V t J > *>i s /> <. M.'. Oil814 pta> wi > yon Cettlr.jen (I5SS) fttvfev Artfclt Continual ioectes Set ho. Vri'isy (?|/S iz- e. aijt no NO o.s-i S. Olga ND ND O.S-I 4. Rigs NO NO 0.5-1 1 tCO.CSO 1. 5.CC0 xa >U>t< WSitC r;--dirs 0 \ * I.CC3 to 4.CCQ ICO to ICO l*Strc?tttO FI liter Chrlitl* Oanilger ftSfaJ Fisher Chrlttla Qamlger (iaj Nice ND s O.S IOO.CCO Rats NO s o.s 0. Rigs M) s O.S ' I Nu-ier of anlrsls and duration of exposure in it 4&av i:o,c:o I,coo 4,100 fcirte* of animals and da-itfcn * ICO,coo of txpoijre irt is atova .ISO Torkalaon Oyaa Rbm OHt) (1) Nurier of anl rail a-id duraiten of exposure in is tint 4C0.CS0 Rata Hr 10 10 7 7 /Sd/k\ id.S.'lo) SCO 0,330 14.CC0 * r t i. i / * ... . _ Cit-Jyu'.tNS n>rosier,r - CarjarouS to life Higher co-ctntrltlcns t*un this cause severe lur; (Jr* end hyftrtr.il of llaar and kidney Order at tonicity ft: caftan tetrachloride s* VC s=uethyl chlgrlca SecBentlal effects oere: 1. Irritation, 1, Increased no tor activity, J. twitching. 4. traror, Incoordination, $. untonselejs, (I.CtfaAtk)tCnl.arcosis. 411 tnt-als racovertd In Nice: light K*g engorgment, kld.-ty tt!|lrr eats and S. Rigs: sa-a Isn; picture. 1/S eilet died after 33 nlnutts, sa*e lj=jt:* at atove fc-t aegeered sooner, fcilnei pigs tint tally for-;} min. aftar a>;ot.ra. S/S ailca and S/S ratt died; 1/5 gulnti pigs died; */S guinea pigs rtco.ered In IS Minutes. I/S gulrea pigs died OrewCh ar.d grois appearance ere nor*el. liver/tody ualght ratio arl atsolvta liver Might larger than ccr.trol In rales, llvar/bcdy helgnt ar.l ahsoluta livar Might rot liresr tun central In fe'ales. Hood SS3T. Sir!, 5ch, alkaline pnaspnatisa arc Mmat. tong argerg no ttri In all species. One rat had fatty livar. Ilrtr and kidney hat congested, tri:`ul aptthe11wn de-sped Same (avara cere Central Ictular Ityar degeneration. Kldnty tutular damage. j . -r o ZZ3 <2 --i rn 011875 . TcteljO"! *0* C19M) Continued *Sf"A!-s S bp. Hrt/JI y din H -i 7 y /. s i z tWOSVSi Cor.c :;n / *n*~l* C;tl Total tote P"-dl.l o tV. , C35: = .J-;:'.S Control ant'al* * , 'i: t I wr-acar l! t'Z-:. til ; i liU , -< (i) ui k ii ; FT s. Ms* It 10 T r a r. Mint nn i i t i Cc;t .1 | j * 17 Hatcfed control*, toth capoied and non* opposed g-cup* 138 to dInay2*04 (C.S ^onths) ZJ SdM 8.CS0 to 8,400 811 group* *'( rtcr**! In appearance, ertollty a-d j'p.tb. tCtntrlpll)tpaliiidy norrjl. hj-i:o;rlt. liter function ttiti (SL"i. SG3T, SSPT, ltlltrr p*-cspi-ittte) acre no mil. *11 Orjanftady e1gnt ratio* narral all `ucept ft and f rat*, uhere Hver/tody Might ntlo Ircreisel. Cron* pathology a* ramal. t!icrejcoplc pjfalcgy m* no mat in all specie* acept liver or It and f rattitj. Central lobular granular degeneration and necrosis. (Zb) St~t protocols i too i 4.0C0 to 4.ZC0 *11 Iri-jts vert rtcrral In appearance, ortality and grp*;*i. Hera tology ( ht'oglobln, beratocrlt, celts) mi ncmal. liver function test* (Sl'i, SGOT. SORT, 1**1in* phosplatest) here norral. llver/bcdy uetght ratio of H and F rats Mr* larger than control*. , (re** and Icroiccpic appearance of tlitue* j hf* eenoal. .1 I V-r - ferr* r %*: * Y. -*' ?i i t 9 f ** r*m*r.1 t *V i i * n *. zzy m i) jd Ucc 011876 t.:*:rj AMW4.S Srtcltt ft* U-S^iv ii't Hr Con:. r- * ; ,TorkeJscn Oyto love (2c) (1SS1) continued l Mitt U) llll t* s 4 H .5 2 n S1 H 5 0.5 H 54 n 12 n 51 N 1 0.5 n 2* 7 t 14 7 S. lift K 12 7 f 12 7 i t liblltJ H t i7 i7 Oojs H i 7 F i7 lettered control!. *roied lid yrx;oied $rot;i. Inter treenbere A&-! (1) (ISM) Sbtr-.in S3 2 0-2 rati IQ 2 0-2 tt 2 0-2 NO I 0-2 HO t S ctn. 42 Bln. DO t 2 *w. .vV Sd/vk for (.5 evnth! s above 2C0 '20 2C0 20 ICO tea 100 ICO 130 xpoturt In m Oajn t 50,CM 1 CO.CCO t 20.00 1t ico.c:} 1S3.CC0 I 1 150,000 t Tot]! Csie o:--di>l_______ C5SC4V-*:C,.5 L1*er/b:i/ velght ritlo larger than control!, not eUttittcally algnlflcint, ft lUe-'to ir *tcIfct ritlo u-e It1 central* L#Uer/t-iyvetc*bt ratio higherthincontroll, not ttitlittcillr lljnlftflcint. Kami In il*l rescectt * All firtrtttrt norril In ill (;e:1ei. . * 0-4.If! 0-5,53: 0-8,JJ: S!2 4,1:1 12,50 f"t5<1cit1o*i, -testing rifle* loit. M:'l 1r:j-;e lnte<1ci;1:r., rlgbtir.g refit* pr*nt. fo-e Inteess 1rt;*1cit1ci, rlg-ittr.j refit* loit. tc--eil re'Ie* dfitpceirs, no jro pittalcj/. tit: t'tillitli. Seijiritary failure of ii't inl-il. Cs*a ereitheiti, co-olett recovery after tipotnre. Mo pathology observed. i r^: * N r.?' r* * wy. 'i ~-v ; - *r *r; ' ;- *c:' v;. c: ^=o>- - t *. i :* * a . --j J tMrs Scccfes ster {ZJ aer.be rg :ms ;$]) lfd. Sherman rats N Sherman rats SUMTVlRlf OF TOXIC.UCr.ICAL DATA Ant-si Eats I Total i Ccnc Close Civ u2VS 1 Dm-Havs Cbservatlcns Pathalccv 8 elV'ter an 100,02: Varlabl anlral deaths, replace-enis were made In then 13 eo.oc: cha-ters. Two -ales survived all IS exposures. ERemaining anl-ats and reelace"ents survived an jjaverare cf eight exrpsjres. Same exposu-as as Ore d!ee i^ter two e/opsvres at 1C2.CC0. above. C.-e diet after t,.o exposures at lOO.CCO and three at e:,cc3. . -J * i- ... -x One died a'tar two extesures at 1C0,CC3 and twelve it 83.000. Slx/nfre survived ell fifteen exposures. Control arl.-als Control animals Growth stopped during exposures and resumed at normal rate after exposures. External appearance r;r-al. Liver color, appearance, consistency, degree of congestion was sa-e as controls. Lungs had fecal fe--:nia which healed a'ter t-: -sa.s of recovery from ep:jre. Cr.e-tMrd of anl-j'j rad p*-asit1c cysts In liver. Liver pathology sa-e as controls, tut more varfatlen 1r. a-.o.nt e* *atty Infiltration. Spleen had advanced lymphocytic hyperplasia. Kidney pathology sa_e as controls. IS S day /23,c:0 i3i,C3C IS week 20.CCO 434.CC: 1/20 died. for 3 External appearance of all animals normal. month: Liver larger, spleen smaller than controls. 411 organs had "pr-al gross appearance. viver parasitic cysts in all animals. White bleed cells lower, lymphocytes hfgha'r, .Iver fat no--a". neutrophils lower than controls. s abrpr-a1 r-.-.:'::y. Body weight and hemoglobin were same as controls. Congestion a.np s-alifng greatc-/'* 15/ Sara IS Same Control animals. 4/30 died. liver than cpnt'ols. ... lor.oestlcr a-d s-e'Mng less in idney than cr-fp's. longestlon and s-alllrg same In I. ipleen as controls. 2c * V I / t' -d rn ucc 011879 crs Scrcies >r (4) iterg JPS t) d. Sherran rats * * ,* \ t .` j*. . * .. * * 1 i; ;* * v x. I 1 5it M F H F * s. 2?r ?iv S '8 58 56 58 __L. > Su^r.iRY cf Trxro'iLC'iCnL c-ta AnfcalCata EOTS'I': Cere. Tivs Total_ flcsa ; Observation Pathol:-:-. i 50CC3 317,000 ;a Fertility. i Gross organ appearance wis sa~e as ||0n days 1-4, anl-als lost welcht, showed 19 50,COO 317,000 'nsusrolocioal s;._:t:_s. controls. Liver pathology shewed ctngested :Cn days 4-:9, vt "vr ,-as r;--l cells. IjSero.T: transJ-lrase, h:-a:;crit, ar.d prothrcr.aln Liver parasitic cysts seen In all ttaes were rorrsl. animals. [White and rad cell ccwr.ts wars lower than controls. * Hair: all S rales had thin heir and scaly tails; 1 feral as and controls were narral. 19 0 19 0 0 0 * liver/fcody weloht ratlowas hi o'er than controls. Control animals. Control anlrals. tr ' ;' ji , t 1 f ` 1 * J; r*: : - ;')i ' ! b 'J i. | 4 | ----- - \ t 42 ` .< ill t . ;r " * | !! ,`i , 1 i - e4 - r 1 11 V" ^ * ^ i 1 I : ; ' . t ; ;--r- l . fl * >' * ... = - * * . i , / / * ' , i1 \ * .. 1 . . . 4f 1 ** 1 t * * -i : ...............- . * - % i|-7- 1* - '* *r ti : V- |. ] 'll |> " \ ' , ' * ` r- . . .4 . ;ii: , * -i *r * .* j.-' -- * }_ i < -\;t * '*i V : p. ^ * . r* * ** . ; . * - T 1 ' I'i1- * M' T * > \,t. ' j /t / K cr> O- CL>- --*i ' . . *-- -* : c~ * O^co --> *~r\ r'' --4 - - CT' "J- * r" *<' x" 1 1 J Jthors uebler 1964) istract izln 1 okhova 1968a) istract .iin okhova -Sflb) jstract zin okhova 969a) stract tin okhova 969b) itract a' u V fcecies Rats Nice G.PIgs Klee NO HD HD NO Rabbits HD . sumw Of TO* [COLO'-, Ia,L 0.1TA * Animal Data exposure Hrs.. total per 1 Cone. Dose : *b. 9a v Da vs 1 oyt' pDn-Oays Observations HD i 100 5.000 41,600 Ho effect at 5,000 and 160,000 ppm. HD 2 100 15,000 125,000 At 5C,00Q, animals were hyperactive, but returned HO 2 100 50,000 416,000 to norral after exposure. HO ).S mil utes Istanc > K0 jlAnfrals sorayed with a shellac-based hair spray 0-25cm HO "chroi 1c" 3,500 3,900 ND Brain electrical activity changes: Appearance of beta haves (50 Hertz' to anterior and posterior hypothalfus along with circulatory changes. Pathology histological damage No change in lung histology Rabbits KD 110 Chinchllla rabbits HO 8 4 167 3,500 (5.S to MS.) 3,900 * HO Decreased heart rate, arrhythmia Altered ^waves In EEG from posterior Decreased ECO voltage Decreased duration of systole hypothalmus. Potentials from anterior and posterior hypothalmus Increased by Reduced blood flow. Increased arterial pressure. 18-303 and 70-853 respectively. 4 150 B to 1 200 After 20 days, blcod adrenaline rose from 3.5 AS0* to to 6.15 itjr'-; at 40 and more days, It was 6.6 300 Posterior hyoothalir.us electrical activity also changed. This Is the direct cause of (hypertension. Rats HD KD ISO (5 awn ths) 11 t1 / ,/ Otsruoted cardiac work rhythm. Bradycardia and arrhythmia. Reduced relative duration of I-It and T--It sound Intervals. Relative duration of ORS complex did not chanoe. After 15 days recovery: cardiac activity rhythm returned to normal, but the duration of the sound Interval remained below initial levels for another IS days. '* Therefore, rax. permissible VC concentration is sign fi cantly less than .03 mg/1 (12 ppm). 1 *< ---------* e- ---- ---------- -- --. -- > . i *v t. eori CD . - (O O f `O rr * <o '.CD ucc 011880 A < Jut'-crs Clapp Kaye Younq (1969) Abstract Mol a ;i970a) * 4 ,* *. * Scccfes Rats Mister Rats '* ' * ` J Mala !1970b) . - Rats Ulster 300 (jm (ofa * igottt . iputo 1971) :t Rats Ulster -P * - ** - `f * 1 |43 ' :> i - 13 \1 j ( if 1 SUtrARV OF TO X ICOLOG tCAL DATA * Animat Oats EXPOSC'E f.r s.. Total per 1 ConcJ Hose ; Sit 3. Gsv Cays l czn Ocn-P-V'S Observations Pathol oo v HI) NO : - ' 1 Sub* NO [Urine contains allylrercapturic acid and 3-hydroxy- Rone observed Cutane' US ' propylnercapturic acid. These conoounds arise by the reactions of ally1 compounds with olutathlones. j. 1 H 25 4 260 30,000 1,300*103MJn*-jls sHqhtly sleeoy durinq exposure. D 25 5 da> s 0 Gross behavior deteriorated after 10 months. ler wi 13/50 died of cardio-respiratory complications. For 13 2/50 died of bleedfnq in the peritoneal cavity. iontbs ) Ho mention of skin tumors. Post animals had pathological involve^-: of brain, liver, kidney, thyroid. Severe proliferation of cartilege and bone abnormalities in small metatarsal bones. Severe tissue degeneration in brain an: liver and thyroid. Connective tissue invaded small arterle In feet. Enlarged, proliferating Kupfer cells ir. liver. . 90 1 1 H 26 4 260 5day/w ; K 25 1 260 Sday/w _____ 10,000 417 Distribution of VC In tissues: Red cells had much more VC than sercn--high None observed. variation VC Is in urine, but major quantity is lost via lunq (yd falls rapidly in first hour in expired air, blood . urine, and brain, liver, kidney. After 3 hrs. no VC Is measurable. 30.00C 1300*103 00 *V 1 1 .j X* , *^ ' * . .' . i '?. . Controls showed no tumors. Almost all exptl. animals developed skin and !ur tiPiors. Very few bone tumors; when s they were in all 4 extremities. 651-70S of turors were skin tumors near parotid and subraxillary qlands Frequencies: SKIN LUNGS BONE 26/25 16/26 Lung tumors were glandular. 16/26 New cartilege and subsequent ossificati In 4 extremetles. , Sard mass first seen after 10 months exposure. ; ~r --* I r !l ! virvr.* t't+f' nrETTTTi ,*f! :. --?--:--. tt-tt-:--`------ ?* ..*1 ft . '! ;* : ' N''* v : . -V<gfc ! -iyJ-jt 'I I- ^V'r *r : ': ' V/Jn&r%/. *. / - ^ ' C/t? ucc 011881 2c rtO o ISJ 1 * SUGARY OF TOXICOLOGICAL DATA Anirnjl llata .th0r5 isalaev azln ochetfcov 1972) bstract * EXPOSURE hrs.. Total. per Cone Dose ` Tcccics Sex Ke; Cav Cavs 0?n Dor*-Oay< Observations Rabbits HD NO NO G nos 12-16 HD tchanqes In electrical activity of hypothalnus. Rats NO NO NO (13C j Kyperadrenalirenia to ! Cardlo-vascular function Impaired. 180 d lys) Sene resorption and osteoporosis. Theory: All syrptem are caused by hypotbalnus disfunction and subsequent honrone ' Iwbalance. 4 *i i * '1 ' ` 1 * * *. i * * T>) ' i >\ -t - i /i I * Pa thoi nov 1_ t * * " * `* `t t g * ; ^ * * ' , , > . t- - . *` ` : \ \ \ 1 j r ---------- - -* - - 1 -- -- ______ O _. : o ... - .- ^ ` *O . p i *. .. - it--- r > ...................- ------------------------ --------------- >* ' t -1- * '-t 7- (O ^ ar--ivtua *-rn* --ri * o . c~y \ -J I JAtHl 0*t\ ti wnwtwy * Sccie* .. ,V. i k WltDBl HI* bti Spra?u*- Davlay * V" it 1 \ l .) 1 * C **- .. *t *f lit* tuiir lata Sfr?u* Bivlty bti btnini , offrln9 ________ Sax TCO. H 3C9 r 268 M 265 p 20C H r 30 K 36 r HO Hra/Oaw 4 *U/vk 4 Sda/wk 4 S4*/wk expos fr cone. Daw* ___ _____ total 3o*a FP^-ifiV* owsntvATiCNS Ourvlvors 41S 10,000 lOSOxlO* 6*000 * ctisxiol 3*500 <265X101 500 61.1X10* ISO <16.6X10* 30 * 1.JX10* 00 0/69 0/93 0/94 0/69 1/69 1/64 1/60 280 to,coo 4*000 1,100 too 250 SO 0 <66X10* 180110* umo* 11X10* n.mo* 1.1X10* 0 36/60 40/60 54/60 56/60 44/60 S0/60 103/190 133 30*000 176X10* 40/60 total 37 >1 31 14 U 0 4 1 1 0 0 0 0 0 2 Uvtr InaUaircorit 4 u 4 a 4 0 4 4 4 0 4 4 4 ""ill tymb*l Sarconat U 9 a a 4 44. 1 l 4 4 1 4T *. Mojr U-U at pro*-) 10*000 4*COO 10,000 4*000 11661 9000 11661 7000 30/30 24/30 0 0 * M/M (11 1 (itibcuUnaoui wgtoiarcoM) 30/12 1 {iitbcutaMoaa Mtloiueou) X Nephfo* Olaatocaa 3 a 4 a s 4 4 0 4 4 4 4 4 4 4 i_ :. 1* - Tr *,,If-1 I. \ rv - ucc 011883 -T^ Ii ft .............. y ^* .ft*,.*, -*T:* l >> ' d t * .* i., 4 ... * * * *' * **'* * v * * . .. ii j \ # *--' 5 .i f. * LIST OF REFERENCES . ,, *...* -- * Bnr'gttat E> D>| R> D< Stewart, and J. e'J Mutchlcr. Monitoring Exposures to vinyl chloride vapor: breath analysis and continuous air sampling. ; ""American Industrial Hygiene Association Journal, Volume 30, pp. 537-544. . ;, . *. 1969. .' * ' Basalaev, A. V., A. N. Vazin and A. G. Kochetkov. Pathogenesis of , . ,, changes developing due to long-term exposure to the effect of vinyl Chloride. GIG TR Prof Zabol 16 (2) :24-27. 1972. ,, *+' `H Clapp, J. J., C. M. Kaye, and L. Young. Metabolism of allyl compounds in the rat. Biochem. Journal 114 (1), pp. 6-7. 1969. %'/- Dinman, B. D., W. A. Cook, W. M. Whitehouse', H. J. Magnuson, and T. Ditcheck. Occupational Acroosteolysis: I. An Epidemiological Study. . 4. Archives of Environmental Health, Volume 22, pp. 61-73, January. 1971. r. .Dodson, V. N., B. D. Dinman, W. M. Whitehouse, A. N. M. Hasr, and 11. J. Magnuaon. Occupational Acroosteolysis: III. A clinical study. . Archives of Environmental Health, Volume 22, pp. 83-91, January'. 1971. Gabor, 5., M. Lecea-Radu, and I. Manta. Certain biochemical indexes of the blood in workers exposed to toxic substances (benzene, chlorobenzene, ' vinyl chloride). Prom. Tokslkol. i Klinike Prof. Zabolevanii Khim. *.. Etiol. Sb. 221-223. 1962 ....... .. ' 4++ * > ** If +0 m 0 ** * * #'! Gabor, S., M. Radu, H. Preda, S. Abrudean, L. Ivanof, Z. Anea, and C. Valaezkay. Inst. Hyg. Cluj., Romania. Bucharest 13 (5), 409-418. 1964. . _ Grigorcseu, I. and C. Toba. Vinyl chloride; Industrial toxicologic ...____ aspects. Rev. Chim. 17(8):499-501. .1966. _______________ * " ,. ' ~i' Harris, D. K. and W. G. F. Adams. Acroosteolysis occurring in men ' engaged in the polymerization of vinyl chloride. Brit. Med. Journal, 5567, pp. 712-714. Illus. 1967. . . - t+ r " ' ' #-,: * .r.* ' '* 1 ., -ft * ._ , Juhe, S., C. E. Lange, G. Stein, and C. Veltman. Uber die sogenannte Vinylchlorid-Krankheit. Dtsch.med. Wschr. 98, pp. 2034-2037. (German). 1973* . ' ... ..._t /**. # = * .. * - *,.t i v*.f. Kramer, C. G., and J. E. Mutchler. The correlation of clinical and environmental measurements for workers exposed to vinyl chloride. American Industrial Hygiene Association Journal, Volume 33(l):19-30. 1971. -i 'I Kudryavtseva, 0. F. Characteristics of electrocardiographic changes in patients with vinyl chloride poisoning. GIG TR Prof Zabol 14 (8):54-56. 1970. .. , k "; ' * V ' .1 * Kuebler, H. The physiological properties of aerosol propellants. Aerosol Age 9(4/, 44, 47-48, 50, 90-91.,, , 1964. :`7v`-v; it y' ucc 011884 *"V=P"** jmEiu,.., "' .. .--''> Lester, D.; L, A;CrcCnberg;'!aiul'^;:B:`A<laiiisr,'''Effects of single;and-; repeated-exposures of-humans nnd rats-to: ylny-l-chloride.-'-Americai*--*-.--.--. --4- -Induetriair-Hygiona^aaociatlon* Joueuaijj.tpp^.-265-275^-Uuy-Juaa*.-uJ;3&X^_ ~- > - - -j *-*-- , b"-* * ixifL: At .r< `,'Ww I T" ~'r .'ir?L-iltoni:~'C,:'prellmItia'rY Report;'dri^the carcinogenlCltybio-aasays j*" ~ Ci__________ of vinyl chloride. -Presented at.OSHA vinyl-chloride fact-finding --.. -- -- - hr^r'^S^Siiingi'Tebriiaty 15T!1974." +-?ZZ'*73n1`' - !"* Markowitz, S. S., C. *j.' McDonald, W. Fethiere^and M. S. Kerzner. - v`."-I Qceupatidrial acroostfeolysis./' ArcTi~Permatol"l66~_(2) :219-223. " 1972r ' "" ` -* * ' , , *";,. 1 i v- 4*# ,, f.i TM - i ... -- - A. 1; "**1 ' . W* * *'-t'x''*rf ^ i *V 4 4.- -- *. ' hT* ^ V- - 4 %V V V- ,* JTE ` '* -V ` . / ,. --j. * - '%_** j-*4 * # -Mara teller,- H<-J <- -Chronic-toxic--livor-damaBO-"in--vorkers-eagaged4n. VVC production. Deutsche Medizinische Wocheijschift 33-2311-2314, 1973. W. - - '* .. s. . **t , j- - A.-**^* * -.VJ " **w*?w*t, ^ L MAstromatteo, E. M.D., AV M."Fisher, 11V Christie,' and'H. Danzlger. : ' : Acute inhalation toxicity of vinyl chloride to laboratory animals. ; *" "* . American "lndustriai"*Hygiene 5ssocIatioa-3ournar"Voi'umo"K2T7jH<*~ v __ *. - . - r^Mcyerson, *L. B. and G. CV Meier. "Cutaneous lesions inacroos teo1ys 1a,"--\ - ' '--/. Arch Dermatol 106_(2):224-227.iJ ri-972. _ ' '. 'T;' -r ~ f. - .-1 R. 'F. Oyen, antfV'V tV. Rowe.'The'toxiclty~of vinyl"1"'*"1 v*," chloride, as determined by repeated exposure^ox.laboratory anioala-^,,___^ 4. .*VAmerican Industrial Hygiene Association Journal,. Volume 22,-No/'5, ppV`~? A '---- ^ 334-361. 1961. m m*~~mmmXI|^S| Iilmmii 1 ti - . -v --^-r-, ------- .> mKi^m^lpn^ _ps 1 n_M l aWihsyepi--. _WJSS__I SHKHL m.|__1-- - ---_ - -Vazin, A. N". and -B* -j..~Plokhova.--- Greation-ofran e^erimental--mo'del^r^J34 ' ~of.!*toxic angloneurosis" developing from'thc^chronic .action, of-:viny.l'_ -uhlorldc Vapors" oir-atr- organlsm^-^CIG^-'ni-Frof^Zabol -1217^47-49-.--1968e-. --V- Vazin, A.'M., `and E4"I. Plokhova;-r^FatHof,ertic effect'of-chronic exposure : vinyl chlnridd*Oirj^abW.ts.'-TPSfmakol iToksctkqlj^61 t3->r369y372 ^r%9Mb.v^r- ' Vpzin,-A. N.*, and E.' I:Plokhova.,;tDynamic changes in epinephrihe^-like---- " Substances, in jrabhit'ihlood'foliovIng^Efconic4:6kpc!S'utfi41t071nljvshlatld<L L. fi J fumes, GIG,TR Prof Zaboi 13(6) J.4G-47. 1969a. T, ' ' - .V. " ...!___ .V . - ** - 4 * '-* - -1 * W4*-r^- ' r-u'f-^*-* Irn J-~L _ J* ||i`_- -- **-1 -*--* . Vazln,~A. H^, E. I./Flokhov-a. ^Changes'in*'tlie' cardiai activity of rats -*-'^cTironicillyexp08edta'vInyr:'cTilorIde'rvapdfsTr"-'FariTialioi-jrofe3ik61,'-*-H,_;^^i^!^ rTr~32(2):220-222. `1969b.J<*'f": 'CTZZ&Z:~ 4#A llri1 -f1 i ... ...Viola, P. Li Pathology, of_vinyl chloridcr^Mcdicina del Cavoro, Volume . _ 61,'No. 3`. March; "1970V' Trans fa tod fromthd'ItallanT`k 1970a.- * t *, -.-e. ^__ * ^ f -- *-w -------^__Viola, I'. Li_,Tlie;y.inyL,Chlorida.i.disen3CV ,(unpublished translation), '--'^=5ummer, ..1970^;^^.^ " VT' *v Viola, P. L*t A* Blgotti* and-A* Capato. Oncogenic response o'rat............ * T skin, lungs, and bones to vinyl chloride. 'Cancer Research, Volume 31, ~~ ' pp. 516-522, May, 1971------------ , .4 . . . ^ ____,.. . 1\ h d- ucc 011885 E' ENVIRONMENTAL ASPECTS OF VINYL/POLY VINYL CHLORIDE US EPA^NATIONAL ENVIRONMENTAL RESEARCH CENTER OCTOBER 15. 1974 } 7. ^ COMMENTS 1. 1 Summary 2nd par. Hie first important use of vinyl chloride was in the manufacture of rubber substitutes; not in the manufacture of synthetic rubber. 7th par. Analysis of vinyl chloride usually reveals trace amounts of organic impurities such as acetylene, 1, 3 butadiene, methyl chloride, and ethylene dichloride* Vinylidene(? ) and vinyl acetate are introduced in the polymerization process. Polyvinyl chloride contains residual entrapped VCM in the parts per million range. The en trapped VCM concentration is dependent upon the production process and can range from nil to 1, 000 to 2, 000 ppm which may be liberated during storage or fabrication. 17th par. The paragraph infers that vinyl chloride is the only cause of angiosarcoma in man. The number of angiosarcoma cases in the United States has been variously estimated as 25 to 75 per year. The fifteen cases related to VCM exposure have occurred since 1961. The primary fact is that a significant number occurred in one plant in one geographical area. In the high population density ucc 011886 ENVIRONMENTAL ASPECTS OF VINYL/POLYVINYL CHLORIDE US EPA NATIONAL ENVIRONMENTAL RESEARCH CENTER OCTOBER 15. 1974 COMMENTS General The report was obviously written by several groups without over- y all control of direction or conclusiVms^ There is a great deal of overlap betw en the various sections. 1. 1 Summary 2nd par. The first important use of vinyl chloride was in the manufacture of rubber substitutes; not in the manufacture of synthetic rubber. 7th par. Analysis of vinyl chloride usually reveals trace amounts of organic impurities such as acetylene, 1, 3 butadiene, methyl chloride, and ethylene dichloride. Vinylidene(?) and vinyl acetate are introduced in the polymerization process. Polyvinyl chloride contains residual entrapped VCM in the parts per million range. The entrapped VCM concentration is dependent upon the production process and can range from nil to 1, 000 to 2, 000 ppm which may be liberated dur ing storage or fabrication. 17th par. The paragraph infers that vinyl chloride is the only cause of angiosarcoma in man. The number of angiosarcoma cases in the United States has been variously estimated as 25 to 75 per year. The fifteen cases related to VCM exposure have occurred sine 1961. The primary fact is that a significant number occurred in one plant in one geographical area, ha the high population density ucc 011887 northeast, every case of angiosarcoma could be a community case if nearness to PVC resin is a criteria. // 19th par. The conclusion in. this paragraph is based on limited studies in the Louisville, Kentucky area and is not supported by the broader epidemiological survey done by Tabershaw/Cooper Associates. 1. 2 Conclusions 1.' 2...................... However, cases of liver angiosarcoma have been reported among workers exposed to VCM but not directly involved in PVC production, raising the question of effects at lower levels of exposure. This conclusion ignores the fact that angiosarcoma occurs in man for other reasons than VCM exposure. The presence of VCM in these cases is an assumption not supported by facts. 3. Observations among workers and in experimental animals indicate there is a multiple cancer risk from exposure to vinyl chloride. ucc 011888 1.2 Conclusions (coat'd. ) 3. The conclusion that human data exists indicating a multiple cancer risk is based on studies done in small worker popu lations without use of control groups. Such work lacks credence. 4. " 5. The EPA studies showed one sample out of many that reached 33 ppm. In normal good analytical practice where 90% of the samples were less than 1 ppm, the existence of one sample at 39 ppm would be viewed as an accident or an error in technique. The one 33 ppm result is given weight far beyond its value in the conclusion* 6. 7. Interim methodology is available for monitoring VCM in the atmosphere, but its precision and accuracy have not been demonstrated in low VCM concentrations ( <10 ppb). 8. 9. 10. ucc 011889 / 1.2 Conclusions H. (cont'd.) 4, 12. The emissions data.............is not sufficiently accurate to serve as a ha a is for the formulation of a quantitative emissions control strategy. This conclusion is very true;. Only plants with continuous monitors can obtain this data. 13. The practicality and effectiveness of carbon adsorption systems, surveillance-maintenance programs, and deep stripping of the polymer remain to be demonstrated as commercially visible control techniques. This true statement also applies to ozone oxidation and incineration. .2 Introduction 1st par. ..............hr the absenceof appropriate premarket testing................ appropriate premarket testing is only revealed by retrospective analyses. 4th par. ..............Vinyl chloride may be disseminated on a broad scale as an unreacted monomer entrapped in finished products............. ucc 011890 Introduction (cont'd. ) 5. This statement implies a hazard to finished plastic products based on no data. If all PVC resin produced contained 1, 000 ppm of free VCM (which all do not), the health hazard contribution from this area would still be insignificant as com pared to VCM and PVC resin plants. Spectrophotometry At lease one installation of infrared spectrometry, using the Fourier transformation, has been installed in a plant with multipoint detectors. Sensitivity of less than 1 ppm is claimed. Sample collection. Liquid scrubbers. Solid Scrubbers. Sample preparation. ucc 011891 /' 4. 1. 7 . Environmental appraisal. 5. 1 6. 5*2 Table 5. 2. 2 PVC Polymer Plant Emissions Data The process data for the Firestone Tire and Rubber Company and the B. F. Goodrich Company is in error. Neither operates a solution polymerization process. Both manufacture suspension resin for solution application; i. e. , lacquer-type coatings. Union Carbide Corporation produces vinyl resins by suspension, emulsion, and solution polymerization. 5.2.3 5.3.2 Summary In all the monitoring data, only one sample shows 33 ppm or even near it. A more scientific approach would be to discount this sample as an error. Errors must occur as frequently in EPA's laboratories as they do elsewhere. This is substantiated by the discussion of duplicate samples which were analyzed in two different laboratores. These duplicate analyses disagreed markedly. ucc 011892 / Estimates of Air Quality Concentrations Estimates made by diffusion equations have not been substantiated by actual test data. This estimate ia nothing more than a mathematical exercise. Union Carbide Corporation's actual monitoring has'been factorially less than diffusion calcu lations . Transformation. Transport, and Removal Environmental Exposure and Receptor Risk The presumption that respirable PVC dust contains measurable amounts of VCM is in error. Resin dust in the range of . 3 micron to 10 microns contains no detectable VCM. Only large resin particles, 50 to 150 microns, contain VCM, and these are neither dust nor respirable. Peak exposures to vinyl chloride in occupational situations may, at times in the past, have exceeded 1, 000 ppm............. although the highest weighted average exposures were probably in the 250-500 ppm range. This statement is in error since it was based on the presumption that the threshold odor limit for VCM was 250 ppm. Data submitted by Union Carbide Corporation showed the threshold ucc 011893 / Environmental Exposure and Receptor Risk (cont'd. ) 8. odor limit was nearly 2, 000 ppm; thus, the concentrations quoted could be higher by a factor of 8. For populations residing in the vicinity of industrial sources preliminary data, described earlier, show peak exposure of 33 ppm and 24-hour samples as high as 1-2 ppm. The statement of 33 ppm peak is based on one un substantiated sample; thus, again undue weight is given potentially poor data. . .Table 611 Relative Importance of Vinvl Chloride Sources for the General Adult Population (mg VCM) The correct unit is /Jg; not mg. Table 6. 1.2 Frequency of Liver Angiosarcoma Among Deceased Vinvl Chloride Workers The mortality data from the Tabershaw/Cooper Associates study is conspicuous by its absence. This data has been published and subjected to critical review. ucc 011894 / 7. 1. 6. 1 Toxicity of Folvvinvl Chloride 9. The free radical content and the level of residual vinyl chloride monomer of PVC resins and plastic end products could effect their toxicity, including potential for carcinogenic activity. This observation is based on no facts. PVC contains very little, if any, free radicals. The nature of the polymerization chain termination precludes this situation. The residual monomer problem occurs only with suspension and bulk polymerized resins and is a temporary situation. PVC will not give off monomer through depolymerization; thus, the emission is limited to th amount left in the manufactured resin. Resin particles of 10 microns or less usually contain no monomer within 24 hours of manufacture. 7. 1. 6. 2 Toxicltv of Fvrolvtic Products of PVC_ Pyrolytic products of PVC have been well identified in a number of published studies. The presence of known carcinogens has not been confirmed. The primary products of pyrolysis are hydrogen chloride, carbon, and some light hydrocarbons. 7. 3. 22 The odor threshold for vinyl chloride in air is approximat ly 2, 000 ppm, not 250 ppm, per Union Carbide Corporation testimony. The estimated historical exposure of workers, where odor was ucc 01A 895 7. 3. 22 / (cont'd.) 10. used as means of estimation is 8 to 10 times that reported with peaks to 10, 000 ppm. 7. 3. 23 The comments regarding fabricating plants do not distinguish between types of resin used and the fabricating technique. Plants based on plastisol technology generally have nil VCM concentration. As noted in a previous comment, Union Carbide Corporation data indicates that respirable PVC dust contains no measurable amounts of monomer; thus, employee exposure via this route is negligible. 7. 3. 24 The questions regarding health studies are very well taken. While there are no published reports, data from control groups tend to duplicate that of the VCM exposed workers. The similarity of exposed workers and control groups is disparaged since control groups come from the same plant or area. When control groups are chosen from outside the area, then uniformity of evaluation becomes a problem. There is a great deal of health study work to be done on a scientific basis as opposed to an emotional basis. ucc 011896 7. 3. 38 Th odor thr ahold of vinyl chloride monomers 1 7.4 Ecology 7. 5 Vinvl Chloride in Perspective Table 7. 5. 1 8. 0 Table 7. 5. 1 is confused. Polyvinyl acetate, polyvinyl alcohol, polyvinyl butyral, and polyvinyl formal have no relationship to vinyl chloride unless one is concerned about the vinyl group (C = C). If this is the case, then ethylene, propylene, styrene, acrylates, etc. should have been included. When carcinogenic studies were undertaken, they were of insufficient exposure duration or involved too limited a number of animals to provide conclusive negative results. Within the emotional framework of the carcinogen problem and the desire for zero cases, there are no facilities in the world large enough to hold all the animals required to provide conclusive negative results. The authorf-s statement sounds good but it infers that the impossible is possible; i. e., prove a negative result. Control Technology and Remedial Actions UCC 011897 8. 1 / 12. Introduction Controls for VCM production do not include activated carbon adsorption or ozone oxidation. The introduction implies these exist. The discussion of emission control would be more meaningful if finite numbers were used. The citing of percentage reductions without the base number leads to misunderstanding. In repeated reference to carbon adsorption and ozone oxidation leads one to assume these are established technology. Carbon adsorption is being tested on a limited scale, and ozone oxidation is not being tested at all. 8, 3. 4 Solution polymerization is a proprietary process of Union Carbide Corporation that in no way resembles the emission characteristics of the suspension process or the emulsion process. RNWheelerJr/ra February 10, 1975 ucc 011898