Document M4LnoYMx3npJJN8gj1B1ewNqk

154 CHAPTER 11 1965 Guide And Data Book Table 2 .... Recommended Threshold Limit Values4 (Continued) Subitance Threshold limit Values ACGIH* 1963 ppm* mg/at m* 0-NaphthylAminp Nickel carbonyl................................................ Nicotine--Skin 1............................................... Nitric acid......................................................... p-Nitroaniline--Skin....................................... Nitrobenzene--Skin........................................ 200 800 - 600 2,000 *- -- 0.001 -- 10 1 A* 0.007 0.5 25-6 5 Nitroglycerin--Skin...................................... Nitromethane................................................... 1-Nitropropane................................................. 0:2 100 25 2 250 90 nitrosamine)--Skin...................................... Nitrotoluene--Skin......................................... Octane.................... ......................................... A* " -- 5 30 500 2,350 Ozone.................................................................. Parathion (O, O. diethvl-O-p-nitrophenvl thiophosphate)--Skin................................. 0.1 -- PentAhorane...................................................... 6.005 Pentachloronaphthalene--Skin.................... -- Pentachlorophenol--Skin.................. ......... -- - - 0.2 .0.1 , .^ 6.01 0.5 0.5 ; 1,000' .. 2,950 Perchloroethylene (tetrachloroethylene)... Perchloromethyl mercaptan.......................... Perchloryl fluoride................................ Phenol--Skin...................................... 100 0.1 3- " 5 670 0.813.5 19 310 - Phenyfhydrazine--Skin............. ................... Phosdrin (2-carbomethoxv-l-methyl vinyl tPhosphine...................................V.. Phosphorus (yellow)........................................ 6 . 22 1 `0.3 --. _ __ . . `4 ,l 0.4 1 0.1 1 Platinum (Soluble Salts)............... .......... .- --*- 0.002 840 ' 25 Propylene dichloride (1,2-dichlsropropane) - 75 Propylene imine--Skin................................... 25 110 350 ' 60 Substance Threshold Uaut Vefau ACGIH* 1963 ppo>b mg/eu ca* Pyridine........................................................... Qjuinone.............................................................. Rotenone (commercial).................................. Selenium compounds (as Se)........................ Sodium fluoroacetate (1080)--Skin............. Sodium hydroxide........................................... Strychnine......................................................... Styrene monomer (phenylethylene)............ 5' 0.1 -- -- -- -- 0.1 500 100 15 0.4 5 0.1 0.05 2 2,900 . 0.15 420 Sulfur hexafluoride.......................................... 1,000 Sulfuric acid...................................................... -- 6,000 x Sulfur monochloride.................................. 1 6- 8ulfur pentafluoride........................................ 0.025 0.25 TEDI5 (tetraethyl dithionoDvropbosphate) --Skin ......................................................... Teflon (R) decomposition products............ ItSVP (tetraethylpyrophosphate)--Skin.. Tellurium........................................................... -- -- -- -- 0-2 A* 0.050.1 1,1,2,2,-Tetrachloroethane--Skin................ 5 35 Tetryl (2r4.6-trinitrophenylmethylnitramine)---Skin.................................................. -- Thallium (soluble compounds)___ ___ Thiran (tetramethyl thiuram disulfide)... Toluene (toluol)......... ...................... --- --_ 200 1 8 1.5 0.1 5 15 .. 750 -Toluidine--Skin................ 5. 100 Trichloronapbthalene--Skin......................... 1,1,2-Trichloro 1,2,2-trifluoroethane........... 1,000 25 1,000 __ .. 22 * , 520 5 7,600 - 100 6,100 1.5 0.1 3 Turpentine........ ............................................. 100- . ___ 660 0.05 ...... 0.25 Vanadium (ViO* fume).. ............................................ -- - 0.5 0.1 (Continued from p. 151) la an application such as an ultra clean room, it may be necessary to know the particle distribution in the air on a count basis, in order to arrive at proper'filtering for the desired atmosphere. Where .such' a particle'count is'required, it isbettor to use simultaneous air sampling to give both weight .toand microscopic count, since it is practically impossible to convert weight measurements a count index.. Such factors as particle size, shape, specific gravity, and the characteristics of the sampling equipment are all important and make a math ematical conversion difficult,-if not impossible. For the removal of non-particulate materials which may have toxic, nuisance, corrosive, or undesirable .odor proper ties, it is necessary to use various absorption systems. Many, of these will be discussed subsequently under the treatment of odors (see Chapter 12). /divGontarmnants - 155 Table 2 .... Recommended Threshold'Limit Values4.(Concluded) ag/aj a* Viiiyl,chloride (chloroethylene). Warfarin (H<'^ton5'iben*y1^ hydroxycoumarin) Yttrium..................... jinc oxide fumes'... -. fljpynium compounds (as ex). 500 1,300 100 480 _ 0.1 --5 200 870 --5 25 5 5 Radioactivity: For permissible concentrations of radioisotopes in air see u. S. Department of Commerce, National Bureau of Standards! Handbook 69, Maximum Permissible Body Burdens and Maximum Concentrations af Radionuclide* in Air and in Water tor Occupational Exposure, June 5, 1959. Also, see U. 8. Depart-, inent of Commerce, National Bureau of Standards, Handbook 59, Permissible Dots from External Sources of Ionising Radiation, September 24, 1954, and addendum of April 15, 1958/ Mineral Durit Subitance opptf* SILICA Threshold Limit calculated from the for- 250! %SiO,+5 - Cristobalite, Threshold limit calculated from the Amorphous, including natural diatomaceous earth'... SILICATES (Less than 1% crystalline silica)-- . 20 . . . 5 20 20 50_-Miscellaneous (less than 1% crystalline silica.).. - -50 Note: The percent' of crystalline silica in the formula is the amount determined from air-borne samples, except in / those matfwji ih which other methods have been mown to be applicable. Conversion factors mppcf X 35.3 -- million particles per cubic'irieter' ' TM particles per c.c. ' Tentative Vehet Substance ppfc mg/ai m* tert. Butyi chromate (as CrOj)............ ..... *-- ... -- 0.1 5. 2 0.1 1.0 4 ACGIH " American Gaafereoco'of Governmental Industrial Hygienist*. BeDimted by permisaico at the ACGIH Committee on Threshold limits. 4 Parts el vapor or gas per million parts et air by Tatums at 29 C and 790 nun. He prssure. rflWn< Vafov* (ConduM) PP*` DDVP (0/ 0-Dimethyl-2,2-dichlorovinyl phosphate)......................... ........................ tDemeton (R) (Systox).................................. Endrin. (1,2,3,4,10, lO-hcxachloro-6,7- ' epoxy-l,4,4a,5,6,7,8,8a-octa hydro, 1,4- endo-5,8-dimcthftnonaphthalene)---Skin. Epicblorohydrin............................................... 5 Ethanolanune................................................... 3. (Graphite..................................................... (Hafnium..................................................... Heptachlor (l,4,5,6,7,8,8a-heptachloro- 3a,4,7,7a-tetrahydn>-4,7-methanoindene) (Methylamine.................................................. 25 tMethyl Methacrylate................................... 100 fMethylene bis phenylisocyanato.............. 0. (Mineral Wool (Fiberglas)............................ (Naphthalene....'........................................... Oil (mineral)..................................................... t/3-Propiolactooe.............................................. (SOver.-.............................................................. (Tantalum................................. .................... (l,l,l,2,-Tetrachloro-2,2,-difiu6roethane. . 1,000 fL1,2,2-TetrachIoro-l,2-difluoroetbaoe-- 500 (Tetraethyl lead--Skin................. (Tin (inorganic compounds)............................... (organic compounds as Sn) 1 19 6 15 mppcf 0.5 0.5 31 410 ' 0.2. 2 50 5 A* 0.05 , 58,340 4,170 0.075 2 0.1 A1 Benzidine. Because of high incidence of bladder tumors in man, any exposure, including skin, is extremely haz ardous. A* ft-Naphthylamme. Because of the extremely high inci dence of bladder tumors' in workers handling this com pound, and the' inability to control exposures, 0naphthylamine has been prohibited from manufacture, use ana other activities that involve human contact by ' the State'of Pennsylvania. A * N-Nitrosodimethylamine. Because of extremely ' high toxicity and presumed carcinogenic potential of this compound, contact by all routes should not be per mitted.. A4 Teflon* decomposition products. At least'one identified component of Teflon* decomposition products is ex tremely toxic, but, in the absence of more complete toxicity information and suitable analytical methods; a definite threshold limit .value is not recommended at t-hia time; but air concentrations should be minimaL-.A* p-Propioladone. Because of high acute toxicity and dem^ onstrated skin tumor production in animals, contact by any route should be avoided........................... * Approximate milligrams et particulata par cc * Millions of particles per eubie foot of air, jnted by light field techniques. f 1963 Eevision. * Criling listing. It is obvious that the continued pollution of the atmosphere by gases from combustion equipment, and by uncleaned waste gases from commercial and industrial establishments, is placing a severe burden, not only upon the engineer who must select air ventilation supply equipment, but also upon the population as a whole. In recent years, several disasters and dramatic air pollution incidents have caused-increased concern. In these instances,the combination of polluted air and unfavorable meteorologi cal And topographical conditions have .resulted in severe exposures for large numbers of the population. Hie Meuse. Valley fog disaster of 1930 in-Belgium, the Donora, Pennsyl vania smog of 1948, and the London smog of 1952, are classic; promplw in the history, of air pollution. In these instances it is