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Chemical Fact Sheet

Chemical Abstract Number (CAS #) 156605
CASRN 156-60-5
Synonymstrans-1,2-Dichloroethene
Ethene, 1,2-dichloro-, (E)-
trans-1,2-Dichloroethylene
Analytical Methods EPA Method 502.2
EPA Method 524.2
EPA Method 601
EPA Method 624
EPA Method 8010
EPA Method 8021
EPA Method 8260
Molecular FormulaC2H2Cl2

Link to the National Library of Medicine's Hazardous Substances
Database for more details on this compound.

Use Used as a solvent for waxes, resins and acetylcellulose. It is also used in the extraction of rubber, as a refrigerant, in the manufacture of pharmaceuticals and artificial pearls and in the extraction of oils and fats from fish and meat. 1,2-Dichloroethylene
Boiling Point 48.0- 48.5 deg C at 760 mm Hg
Melting Point -50 deg C
Density 1.2565 at 20 deg C/4 deg C
Odor Threshold Concentration Odor low: 0.3357 mg/cu m; Odor high 1975.00 ppm
Sensitivity Data This liquid can act as a primary irritant producing dermatitis and irritation of mucous membranes. 1,2-Dichloroethylene 1,2-Dichloroethylene is an eye irritant. 1,2-Dichloroethylene
Environmental Impact Trans-1,2-dichloroethylene may be released to the environment in air emissions and wastewater during its production and use. Under anaerobic conditions that may exist in landfills, aquifers, or sediment one is likely to find 1,2-dichloroethylenes that are formed as breakdown products from the reductive dehalogenation of common industrial solvents trichloroethylene, tetrachloroethylene, and 1,1,2,2-tetrachloroethane. The cis-1,2-dichloroethylene is apparently the more common isomer found although it is mistakenly reported as the trans isomer. The trans-isomer, being a priority pollutant, is more commonly analyzed for and the analytical procedures generally used do not distinguish between isomers. If trans-1,2-dichloroethylene is released on soil, it should evaporate and leach into the groundwater where very slow biodegradation should occur. If released into water, trans-1,2-dichloroethylene will be lost mainly through volatilization (half-life 3 hr in a model river). Biodegradation, adsorption to sediment, and bioconcentration in aquatic organisms should not be significant. In the atmosphere, trans-1,2-dichloroethylene will be lost by reaction with photochemically produced hydroxyl radicals (half-life 3.6 days) and scavenged by rain. Because it is relatively long-lived in the atmosphere, considerable dispersal from source areas should occur. The general population is exposed to trans-1,2-dichloroethylene in urban air as well as in contaminated drinking water from ground water sources. Occupational exposure will be via dermal contact with the vapor and liquid or via inhalation.
Environmental Fate Aquatic and Atmospheric Fate: Photodissociation is not a significant fate for trans-1,2-dichloroethylene in the aquatic or atmospheric environment. Oxidation and hydrolysis in the aquatic environment is not significant for this compound. Aquatic Fate: Volatilization is a major transport process for removal of trans-1,2-dichloroethylene from aquatic systems. TERRESTRIAL FATE: If trans-1,2-dichloroethylene is released to soil, it should evaporate and leach into the groundwater where it may very slowly biodegrade. AQUATIC FATE: If released into water, trans-1,2-dichloroethylene will be lost mainly through volatilization (half-life 3 hr in model river). Biodegradation and adsorption to sediment should not be significant. ATMOSPHERIC FATE: In the atmosphere trans-1,2-dichloroethylene will be lost by reaction with photochemically produced hydroxyl radicals (half-life 3.6 days.) There is evidence that it will be scavenged by rain which is to be expected of a water soluble chemical.
Drinking Water Impact DRINKING WATER: Trans-1,2-dichloroethylene was found in Miami drinking water at 1 ppb . The concn of trans-1,2-dichloroethylene in private wells in 5 homes in northern Winnebago County, IL ranged from ND to 64 ppb, 8 ppb median . The chemical was found in a groundwater plume of predominantly trichloroethylene believed to originate from an old industrial source . Two production wells belonging to the Lakewood Utility district near Tacoma, WA contained 200 ppb of trans-1,2-dichloroethylene from a nearby commercial facility . In a survey of purgeable organics in 12 parts of the world outside of Europe and North America, only northern Egypts' contained trans-1,2-dichloroethylene ; measured conc 0.5 ppb . GROUNDWATER: 4.6% of the 315 wells sampled from the outcrop area of the Potomac-Raritan-Mogothy aquifer system adjacent to the Delaware River contained trans-1,2-dichloroethylene . The chemical was absent from wells downdip of the outcrop area . A site study of a western Connecticut manufacturing plant that used large quantities of high quality trichloroethylene for degreasing found that 7 of 9 monitoring wells around the plant contained 1.2 - 320.9 ppb of trans-1,2-dichloroethylene . EFFL: In a comprehensive survey of wastewater from 4000 industrial and publicly owned treatment works (POTWs) sponsored by the Effluent Guidelines Division of the U.S. EPA, trans-1,2-dichloroethylene was identified in discharges of the following industrial category (frequency of occurrence; median concn in ppb): iron and steel mfg (2; 2265.9), organics and plastics (3; 14.6), inorganic chemicals (2; 3.9), rubber processing (2; 19.0), auto and other laundries (1; 60.6), explosives (1; 3.9), electronics (7; 140.7), mechanical products (2; 13.7), transportation equipment (1; 29.3), publicly owned treatment works (63; 16.3) . The highest effluent concn was 3013 ppb in the iron and steel mfg industry . In another survey of the industrial occurrences of trans-1,2-dichloroethylene, 4 industries had wastewater discharges of >0.1 kg/day. These (industry (mean conc (ppb); Max conc (ppb))) were: metal finishing (260;1700), photographic equipment/supplies (-;2200), nonferrous metal mfg (75;260), rubber processing (150;290) . The concn of trans-1,2-dichloroethylene in 3 sewage treatment effluents ranged from 31 to 43 ppb . While effluent from the Los Angeles City, Orange County and San Diego County contained <10 ppb of trans-1,2-dichloroethylene, sludge from two of the plants contained 145 and 44 ppb of the chemical(6). At the Valley of the Drums waste site near Louisville, KY, water samples contained trace amounts to 75 ppb of trans-1,2-dichloroethylene, while some sediment samples contained trace amounts of the chemical . In the National Urban Runoff Program in which samples of runoff were collected from 19 cities (51 catchments) in the U.S., trans-1,2-dichloroethylene was detected in Eugene, OR and Little Rock, AK (5% of the samples) at levels of 1-3 ppb . In a four city study (Cincinnati, St. Louis, Atlanta, and Hartford) to determine the major source type of priority pollutants in tap water and publicly owned treatment work (POTW) influents, it was found that 43%, 38%, and 28% of commercial sources, industrial sources, and POTW influents contained trans-1,2-dichloroethylene . The average level of the industrial sources was between 10 and 100 ppb while the others were <10 ppb .

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