| Chemical Abstract Number (CAS #) |
126998
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| Synonyms | Chloroprene |
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2-Chloro-1,3-butadiene | 1,3-Butadiene, 2-chloro- |
| Analytical Methods |
EPA Method 8010B |
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EPA Method 8240B |
EPA Method 8260A |
EPA Method 8260A |
| Molecular Formula | C4H5CL |
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| Use | Used as a chemical intermediate in the manufacture of artificial rubber.
AS COMPONENT OF ADHESIVES THAT ARE INTENDED FOR USE IN FOOD
PACKAGING.
MANUFACTURE OF NEOPRENE.
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| Consumption Patterns | ESSENTIALLY 100% AS A MONOMER FOR NEOPRENE ELASTOMERS.
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| Apparent Color | COLORLESS LIQUID
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| Odor | VAPOR HAS PUNGENT, ETHEREAL ODOR
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| Boiling Point | 59.4 DEG C
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| Melting Point | -130 deg C
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| Molecular Weight | 88.54
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| Density | 0.9583 @ 20 DEG C/4 DEG C
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| Sensitivity Data | BETA-CHLOROPRENE IS A LACRIMATOR.
Irritating to eyes and nasal system.
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| Environmental Impact | The main sources of environmental release of 2-chloro-1,3-butadiene are probably the
effluent and emissions from plants which use this compound to make polychloroprene elastomers.
If released to soil, 2-chloro-1,3-butadiene should be susceptible to removal by rapid volatilization
and transport by leaching into groundwater. Chemical hydrolysis is not expected to occur. If
released to water, volatilization is predicted to be the dominant removal mechanism (t1/2 3 hours
from a model river 1 m deep with a current speed of 1 m/sec and wind speed of 3 m/sec). In water
this compound is not expected to chemically hydrolyze, adsorb significantly to suspended solids
or sediments, or bioaccumulate in aquatic organisms. If released to the atmosphere,
2-chloro-1,3-butadiene is expected to exist almost entirely in the vapor phase. The primary
removal mechanism should be reaction with photochemically generated hydroxyl radicals with
small amounts of 2-chloro-1,3-butadiene being removed by reaction with ozone. The overall
reaction half-life has been estimated to be 1.6 hours. Anticipated reaction products include
formaldehyde, 1-chloroacrolein, glyoxal, chloroglyoxal, chlorohydroxy acids and aldehydes. The
most probable route of human exposure to 2-chloro-1,3-butadiene is inhalation by workers
involved in the production or use of this compound.
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| Environmental Fate | TERRESTRIAL FATE: If released to soil, 2-chloro-1,3-butadiene is expected to be
susceptible to rapid volatilization and extensive leaching into groundwater.
2-chloro-1,3-butadiene will not be susceptible to chemical hydrolysis.
AQUATIC FATE: If released to water, volatilization is expected to be the dominant removal
mechanism. The volatilization half-life from water 1 m deep with a current speed of 1 m/sec and a
wind speed of 3 m/sec has been estimated to be approximately 3 hours. 2-Chloro-1,3-butadiene is
not expected to undergo chemical hydrolysis, adsorb significantly to suspended solids or
sediments, or bioaccumulate in aquatic organisms.
ATMOSPHERIC FATE: Based on vapor pressure of 174 mm Hg at 20 deg C ,
2-chloro-1,3-butadiene is expected to exist almost entirely in the vapor phase in the
atmosphere(1-2 SRC). 2-Chloro-1,3-butadiene is predicted to be removed from the atmosphere
by reaction with photochemically generated hydroxyl radicals (half-life hours) and ozone (half-life
12 hours). The overall reaction half-life of the compound in the atmosphere has been estimated to
be 1.6 hours. Anticipated reaction products include formaldehyde, 1-chloroacrolein, glyoxal,
chloroglyoxal chlorohydroxy acids and aldehydes. Removal by wet or dry deposition is
unlikely .
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| Drinking Water Impact | SURFACE WATER: 2-Chloro-1,3-butadiene was detected in 1 out of 204 samples of
surface water taken from sites near heavily industrialized areas across the US during 1975/76 .
EFFL: 2-Chloro-1,3-butadiene was identified in 2 out of 63 industrial effluents at a
concentration of (10 ug/L) .
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