Document 4OwLDvob50JmDgO2wZVrQzoV

ELEMENTS OF INDUSTRIAL TOXICOLOGY TABLE 40-C MAXIMAL ACCEPTABLE CONCENTRATIONS (Continued) Amencan Standard Substance . MAC ppm mg/m3 Z37.1-1941 Carbon monoxide 100 110 Z37 2-1941 Hydrogen sulfide 20 280 Z37 3-1941 Carbon disulfide 20 620 Z37 4-1960 Benzene (benzol) 25 80 Z37 6-1948 Manganese 60 Z37 7-1943 Chromic Acid and chromates 01 237 8-1943 Mercury 01 Z3710-1960 Xylene 200 880 Z37 11-1943 Lead and certain of its inorganic compounds 015 Z37 12-1960 Toluene 200 75 2 Z37 13-1962 Nitrogen dioxide 5 94 Z37 14-1944 Methanol 200 26 0 Z37 16-1944 Formaldehyde 10 12 0 Z3717-1957 Carbon tetrachloride 25 157 Z37 18-1949 Methvl chloride 100 200 Z37 19-1946 Tnchloroethylene 200 1,070 Z37 23-1982 Methvlene chloride 500 1,700 Z37 27-1981 p-Dichlorobenzene 75 450 (Text continued from page 40-3) Documentation of Threshold Lantt Values, the Hygienic Guides published by the Ameri can Industrial Hygiene Association (A1HA), and the articles of W. A Cook and H F. Smyth, Jr Available references are also given m National Safety Council's Industrial Data Sheet 486, Chemical Safety References Catalog of Toxic Substances No attempt has been made to give detailed directions for handling each substance in the following list, since such directions would be repetitious. Instead, enough information is given to permit safe methods to be adopt ed when combined with the directions for manual and power handling of materials given in previous chapters This informa tion should also be used in conjunction with the procedures for recognition, evaluation, and control of health ha2ards discussed in Chapter 39, "Industrial Hygiene " Some of the signs of excessive exposure to toxic substances are indicated in the fol lowmg catalog, but should not be taken as conclusive evidence, particularly in cases of possible chronic exposure To definitely im plicate a specific substance requires evidence of both the degree and length of exposure to it and the absence of other causative agents The following list presents a representa tive sampling of the toxic substances en countered in industry and does not describe each of die substances in Table 40-B for which threshold limit values have been es tablished The Documentation of Threshold Limit Values, published by the American Conference of Governmental Industrial Hy gienists, should be consulted for this type of detailed information The Hygienic Guides, published by the American Industrial Hygiene Association, and the National Safety Council's Industrial Data Sheets are listed at the end of the dis cussion of many of the substances and should also be consulted for further infor mation. Flammable and explosive hazards of many of the following substances are given in Chapter 41, "Table of Chemical Hazards" Acetaldehyde (acebc aldehyde) is a flam mable liquid with a low flash point and a boiling {mint just at normal room tempera ture It is, consequently, a fire hazard com- 40-13