SPECTRUM

Chemical Fact Sheet

Chemical Abstract Number (CAS #) 156592
CASRN 156-59-2
Synonymscis-1,2-Dichloroethene
cis-1,2-Dichloroethylene
Analytical Methods EPA Method 502.2
EPA Method 524.2
EPA Method 8021
Molecular FormulaC2H2Cl2

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

Use SOLVENT & CHEMICAL INTERMEDIATE. SOLVENT (AS ISOMERIC MIXT) FOR PERFUMES, DYES, & LACQUERS. SOLVENT (AS MIXT) FOR THERMOPLASTICS, FATS, & PHENOLS. SOLVENT (AS MIXT) FOR CAMPHOR & NATURAL RUBBER. CHEM INT (AS ISOMERIC MIXT) FOR CHLORINATED CMPD. AGENT IN RETARDING FERMENTATION. 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 CIS- & TRANS-ISOMERS OF 1,2-DICHLOROETHYLENE HAVE HAD USE AS SOLVENTS & CHEM INTERMEDIATES. NEITHER OF ISOMERS HAS DEVELOPED WIDE INDUSTRIAL USAGE IN THE US PARTLY BECAUSE OF THEIR FLAMMABILITY. CIS AND TRANS ISOMERS
Apparent Color Liquid; Colorless
Boiling Point 60.3 DEG C @ 760 MM HG
Melting Point -80.5 DEG C
Molecular Weight 96.94
Density 1.2837 @ 20 DEG C/4 DEG C
Sensitivity Data 1,2-Dichloroethylene is an eye irritant. 1,2-Dichloroethylene
Environmental Impact Cis-1,2-dichloroethylene may be released to the environment in emissions and wastewater during its production and use. Under anaerobic conditions that may exist in landfills or sediment, one is likely to find 1,2-dichloroethylenes that are formed as breakdown products from the reductive dehalogenation of trichloroethylene and tetrachloroethylene. The cis-1,2-dichloroethylene is apparently the more common isomer found although it is mistakenly listed 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 the isomers. If cis-1,2-dichloroethylene is released on soil, it should evaporate and/or leach into the groundwater where very slow biodegradation should occur. If released into water, cis-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 cis-1,2-dichloroethylene will be lost by reaction with photochemically produced hydroxyl radicals (half life 8 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 cis-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 TERRESTIAL FATE: If cis-1,2-dichloroethylene is released on soil, it should evaporate and/or leach into the groundwater where very slow biodegradation should occur. AQUATIC FATE: If released into water, cis-1,2-dichloroethylene will be lost mainly through volatilization (half life 3 hr in a model river). Biodegradation and adsorption to sediment should not be significant. ATMOSPHERIC FATE: In the atmosphere cis-1,2-dichloroethylene will be lost by reaction with photochemically produced hydroxyl radicals (half-life 8 days). There is evidence that it will be scavenged by rain which is to be expected of a water soluble chemical.
Drinking Water Impact Evaporation from water at 25 deg C of 1 ppm solution: 50% after 24 min, 90% after 83 min. 1,2-Dichloroethylene DRINKING WATER: Cis-1,2-dichloroethylene was found in Miami drinking water at 16 ppb and Cincinnatti and Philadelphia drinking water at 0.1 ppb, but was absent from 7 other drinking waters surveyed . GROUNDWATER: Raw water from a well in Wausau, WI contained 83.3 ppb of cis-1,2-dichloroethylene . Studies of the contaminants in shallow groundwater at the Miami Drum site, an inactive drum recycling facility, reported 839 and 13.3-17.9 ppb of cis-1,2-dichloroethylene . The Biscayne aquifer, that supplies drinking water to residents of Dade County contained 0-26 ppb of cis-dichloroethylene in the vicinity of the Miami Drum site . SURFACE WATER: Cis 1,2- dichloroethylene was found along a 30 km stretch of the Glatt River in Switzerland at load levels of 1 g/hr . EFFL: In a comprehensive survey of wastewater from 4000 industrial and publicly owned treatment works (POTWs) sponsored by the Effluent Guidelines Division of the USEPA, cis-1,2-dichloroethylene was identified in discharges of the following industrial category (frequency of occurrence; median concn in ppb): steam electric (1; 1.6), leather tanning (1; 3.3), iron and steel mfg (2; 1400.8), nonferrous metals (1; 314.6), organics and plastics (2; 121.5), textile mills (1; 8.3), plastics and synthetics (3; 20.1), rubber processing (1; 712.0), explosives (1; 1.5). The highest effluent concn was 2059 ppb in the iron and steel mfg industry .

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