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pc�ctnn L abarato�=:Chenf ical Pact 5;heet-Cas#71432 4ttpJlwww.specl ab.cor rVr,ompound/c92527. Dmraad: 1y86: 1.,663 mi.ihon�gal; 1987; 1,667 mill on.gal, 1991.projeciedl: 1,,790 ( Tion gal.(Includes inj orts; 155 million gal were imported in 1.9.86.) �--. APFarent i5loi CLEAR,' COLORLESS IAQ;RHOMBIC PxUsMS: �+ Odin ARo rA Ic'DOR } Boiling Point : 180.1 DE G. C �F Melting Mut 5.5-DEG C .. Molecular Weight 7.8.11 Density.. - i 4.8787 AT 15 DEG. 4 DEG C 13ENZENEHAS DISTINCTIVE SRP:AROMATIC ODOR HOWEVER opt Threshold CConcentrat>ion IWARNMO PROPERTIES ARE INADEQUATE SINCE IOD PPM HAS IRItIT'ATION R:A.TINO OF o&ODOR INTENSITY BETWEEN 1 &2. ,68 PPM la air.49 mglcu m(characteristic odor),is water:2.0 mg/L Sensitivity Data Benzene is irritant to skin Benzene will enter the atmosphere primarily from fugitive emissions and exhaust connected with its use in gasoline. Another important source is emissions associated with its production and use as an industrial intermediate.In addition,there are discharges ills into water from industrial effluents and losses during sp .If benzene is relmi-,d-to soil,it will be subject to rapid volatilization near the surface and that which does not evaporate will.be highly to very highly mobile in tkie soil and may f leach to gro#dwaiter.It may be subj ect to biodegradation.based on reported biodegradation of 24%and 47%.of the initial 20r ppm bcnzent 1 a base rich pard-brownish soil in I and 10 weeks,respectively.It may be s'ubj ect to biodegradation in shallow,aerobic groundwaters,but probablynot under anaerobic ! conditions.If benzene is released to water,it will be subject to rapid,volatilization; the half-life for evaporation in a wind-wave tank with a moderate wind speed of 7.09 misec Was 5:23 hrs;tlae estimated half-life for volatilization,of benzene from a model river one meter deep flowing 1 msec with awind velocity of 3 ni/sec is estimated to be 2.7 hrs at 20 deg C.It will,not be expected.to significantly adsorb to sediment;bioconcentrate in-aquatic organisms or hydrolyze.Jt may be subject to Rnvi-onmeratal Impact ;biodegradation based on a reported biodegradation half life of 16 days in an.aerobic river die-away test,In a marine ecosystem,biodegradation occiured in 2 days after an a.celimattion period of 2 days and!weeks in the.summer and spring,respectively; whereas no degradation occurred in winter.According to one experiment,benzene Ihas a half-life of 17 clays due to photodegra4#on which could contribute to bmzenc's removal in situations of cold water,poor nutrients,or other conditions less conductive to microbial degradation:Ifbenzene is released to the atmosphere,it will exist predominantly-in the vapor phase.Gas-phase benzene will not be subject to direct photolysis but it will react with photochtmically produced hydroxyl radicals with a Half-life of 13.4 days calculated using an experimental rate constant ;for the reaction.The reaction time in polluted atmospliares which contain nitrogen oxides or sulfur dioxide is accelerated-with the half-life being reported as 46 hours. Products of phatooxidation include phenol,nitrophenols,nitrobenzene,formic acid, �. and peroicyacctyl nitrate.Benzene is fairly soluble iii water and is removed from.the j atmosphere in rain..The.primary routes of exposure are inhalation of contaminated Iair,especially in areas with high traffic,and in the vicinity o€.gasoline senlice stations.and consumption of contaminated drinking water. r w—: � -----;TERRESTRIAL FATE:If benzene is released to soil it will be subject to rapid i !volatilization near the surface.That which does not evaporate u+ill be highly to very. i ,higblymobile in soil and may leach to groundwater.The effective half-lives for !volatilization without water evaporation from soil to benzene uniformly distributed. , { ;to.1 and 10 ern in soil were 7.2 and 3 8.4 days,zespectivaly..It may be subject to � jbiodegradatian based on reported biodegradation o€24°!o and 47%o£the initial 20. (1 } ppm b6nzene in is based-rich para-brownish soil in I and"1Q we respectively..It may be subject to biodegradation in shallow,aerobic grofmdwaters,but probably not under'anaerobic conditions.AQUATIC FATE:If benzene is released to water,it t (will bp,subject to rapid volatilization.;the half-li:e£or'evaporation in a wind-wave �nPA 1