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;,pectrum Laboratories Chemical Fact Sheet - Cas# 107062 Page 2 of 3 A arent Color iCLEAR,COLORLESS,OILY LIQUID Odor IPLEASANT ODOR;CHLOROFORM-LIKE ODOR;Sweet Density 1.2351 AT 20 DEG C Although olfactory warning properties are limited by development of tolerance,this liquid has an odor detectable between 6&40 ppm. Of 20 subjects, 13 could detect ethylene dichloride at 6 ppm Odor Threshold (23.2-24.9 mg/cu m),6 persons could detect it at 4.5 ppm(17.5 mg/cu m),and 1 person at 3 ppm CoIICeIItration (12.2 mg/cu m). Odor is not a dependable guide for avoiding dangerous chronic exposures to EDC.The odor may be considered pleasant until well above 180 ppm,and may be missed below 100 ppm.Detection in air=2.5X 10-2 mg/l(gas),chemically pure Odor threshold low:24 mg/cu m;high:440 mg/cu m. The majority of 1,2-dichloroethame released into the environment will enter the atmosphere mostly! from its production and use as a chemical intermediate,solvent,and use as a lead scavenger in gasoline.Once in the atmosphere,it may be transported Iong distances and is primarily removed Environmental by photooxidation(half-life approx. 1 month).Releases to water will primarily be removed by Impact evaporation(half-life several hours to 10 days).Releases on land will dissipate by volatilization to air and by percolation into groundwater where it is likely to persist for a very long time. 1,2- Dichloroethane is not expected to bioconcentrate in the food chain;its presence in some food products is probably due to its use as an extractant.Major human exposure is from urban air, drinking water from contaminated aquifers and occupational atmospheres. TERRESTRIAL FATE: Smaller releases on land will evaporate fairly rapidly because of 1,2- dichlorethane's moderately high vapor pressure.Larger releases may leach rapidly through sandy soil into groundwater.AQUATIC FATE: When 1,2-dichloroethane is released to surface water,its! primary loss will be by evaporation.The half-life for evaporation will depend on wind and mixing conditions and was of the order of hours in the laboratory.However a modeling study using the EXAMS model for a eutrophic lake gave a half-life of 10 days .The half-life for evaporation Environmental would be much less in a river or stream.Chemical and biological degradation is expected to be Fate very slow. Adsorption to sediment is not expected.ATMOSPHERIC FATE: When released to the atmosphere, 1,2-dichloroethane will degrade by reaction with hydroxyl radicals which are formed photochemically in the atmosphere with a half-life of a little over a month. One would expect the chemical to be transported long distances and be washed out in rain.Aquatic and Atmospheric Fate: Chloroethanes are expected to be present in industrial air and water emissions.They volatilize rapidly from surface water and persist in urban atmospheres. Hydrolysis and biodegradation are expected to be slow.Chloroethanes 1,2-Dichloroethane was found in the waters of 28 cities at level of 0-6 ug/l.The Aerojet-General Corporation reports that 1,2-dichloroethane has been identified as a groundwater contaminant at a site outside Sacramento,CA.SURFACE WATER:USA-6 river basins 1-90 ppb,53 of 204 sites pos,only 1 site above 15 ppb;Ohio R basin(1977-1978)0.1-29 ppb,39 of 243 samples pos; Ohio R basin(1980-1981,4972 samples)7%pas,44 samples 1-10 ppb; 105 USA cities-raw drinking water 1-4 ppb,0.55 ppb median,9.5%pos; 80 USA municipal water systems-raw water 0-0.3 ppb, 14%pos;Lake Erie-2 sites,4 ppb, 1 site pos(6). SEAWATER:Gulf of Mexico 0-210 pa trillion(anthropogenic influence)and not detected(unpolluted areas).GROUNDWATER: Drinking Water 13 USA cities-rawoundwater 0.2 b 7.7% Impact � pp � pos •� State groundwater survey:2 states 400 ppb max,7%pos,Aerojet General Rocket Plant-well water, Sacramento-up to 52 ppm. DRINKING WATER: 133 USA Cities-finished surface water 0.8-4.8 ppb, 1.8 ppb median, 4.5% pos;25 USA cities-finished groundwater-0.2 ppb avg,4.0%pas .National Organic Monitoring Survey(1976-77)-3 of 218 samples pos,limits of detection<0.2 ppb .Detected in 7 wells in the Central Sands area of Wisconsin 2 of which exceeded the recommended health advisory of 7 ppb (detection limit=0.1-3.0 ppb).EFFL:Industries whose wastewater may exceed a mean of 1000 ppb include:photographic equipment/supplies,pharmaceutical mfg and organic chemicals/plastics mfg;max conn in wastewater was 14 ppm(pharmaceutical mfg) . http://www.speciab.com/compound/cIO7062.htm 811/00