| Chemical Abstract Number (CAS #) |
156592
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| Synonyms | cis-1,2-Dichloroethene |
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cis-1,2-Dichloroethylene |
| Analytical Methods |
EPA Method 502.2 |
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EPA Method 524.1 |
EPA Method 524.2 |
EPA Method 8021A |
| Molecular Formula | C2H2Cl2 |
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| 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
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| Apparent Color | Liquid; Colorless
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| Boiling Point | 60.3 DEG C @ 760 MM HG
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| Melting Point | -80.5 DEG C
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| Molecular Weight | 96.94
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| Density | 1.2837 @ 20 DEG C/4 DEG C
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| Sensitivity Data | 1,2-Dichloroethylene is an eye irritant. 1,2-Dichloroethylene
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| 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.
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| 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.
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| 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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