| Chemical Abstract Number (CAS #) |
510156
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| CASRN |
510-15-6 |
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| Synonyms | Chlorobenzilate |
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Ethyl-4,4'-dichlorobenzilate | Benzeneacetic acid, 4-chloro-alpha-(4-chlorophenyl)-alpha-hydroxy, ethyl ester | Acaraben | Benzilan | ECB | Folbex |
| Analytical Methods |
EPA Method 508 |
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EPA Method 8081 |
| Molecular Formula | C16H14Cl2O3 |
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Link to the National Library of Medicine's Hazardous Substances
Database for more details
on this compound. |
| Use | ACARICIDE IN SPIDER-MITE CONTROL; USED AS A SYNERGIST FOR DDT
/SRP: FORMER USE IN USA
ON PREMISE & FOR PLANT MITE CONTROL. POOR EFFECTIVENESS VERSUS D
GALLINAE ON POULTRY. SRP: FORMER USE IN USA
CHLOROBENZILATE WAS ONE OF THE SEVERAL COMPOUNDS WHICH WERE
EFFECTIVE AGAINST THE CITRUS RUST MITE PHYLLOCOPTRUTA OLEIVORA.
(FORMER USE)
ACARICIDE FOR CITRUS CROPS, ORNAMENTALS, COTTON, (NON-CITRUS) FRUITS
& NUTS SRP: FORMER USE IN USA
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| Consumption Patterns | ACARICIDE FOR CITRUS, 100% (1982)
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| Apparent Color | Colorless solid (pure)
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| Boiling Point | 146-148 DEG C AT 0.04 MM HG
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| Melting Point | 36 TO 37.3 DEG C
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| Molecular Weight | 325.20
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| Density | 1.2816 G/CU CM AT 20 DEG C
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| Environmental Impact | Chlorobenzilate will enter the environment principally during spraying operations when it
is applied as an acaricide (miticide). If released to soil, chlorobenzilate will be expected to exhibit
low mobility in soil and, therefore, will not be expected to leach to groundwater. It will not be
expected to volatilize from near surface soil or surfaces. It will be subject to biodegradation. The
half life of chlorobenzilate in two fine sandy soils was estimated to be 1.5-5 weeks following
application of 0.5-1.0 ppm probably due to biodegradation. If it is released to water,
chlorobenzilate will be adsorbed by sediment and suspended particulate material. It should not
bioconcentrate in aquatic organisms or volatilize. It may be susceptible to biodegradation. In 22
days, 40, 29, and 39% of the chlorobenzilate added to sediment free water samples from 3 fresh
water lakes was converted to organic products. Degradation in water from a fourth lake occurred
only when glucose and inorganic nutrients were added suggesting that chlorobenzilate may be
metabolized in the lake waters. If released to the atmosphere, chlorobenzilate will be susceptible
to gas phase reaction with photochemically produced hydroxyl radicals with an estimated half life
of about 3.3 hr. Humans may be exposed to chlorobenzilate during spraying operations and from
fruit and vegetables which have been treated.
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| Environmental Fate | TERRESTRIAL FATE: If released to soil, chlorobenzilate will be expected to exhibit
low mobility in soil(2-4) and, therefore, will not be expected to leach to groundwater. It
will not be expected to volatilize from near surface soil or surfaces(2,5). It will be subject to
biodegradation . The half life of chlorobenzilate in two fine sandy soils was estimated to be
1.5-5 weeks following application of 0.5-1.0 ppm probably due to biodegradation .
AQUATIC FATE: If it is released to water, chlorobenzilate will be adsorbed by sediment and
suspended particulate material(2,3,SRC). It should not bioconcentrate in aquatic
organisms(2,3,SRC) or volatilize(2-4). It may be susceptible to biodegradation . In 22 days, 40,
29, and 39% of the 14-C-ring-labeled chlorobenzilate added to sediment free water samples from
3 fresh water lakes was converted to organic products but no 14- carbon dioxide evolution was
detected . Addition of sediment to the lake waters lead to evolution of 3.6, 0.0, and 18.3%
14-carbon dioxide , respectively . Degradation in water from a fourth lake occurred only when
glucose and inorganic nutrients were added suggesting that chlorobenzilate may be metabolized in
the lake waters .
ATMOSPHERIC FATE: If released to the atmosphere, chlorobenzilate will be susceptible to
gas phase reaction with hydroxyl radicals . The rate constant for the vapor phase reaction of
chlorobenzilate with photochemically produced hydroxyl radicals has been estimated to be
4.92X10-12 cu cm/molecule-sec at 25 deg C which corresponds to an atmospheric half life of
about 3.3 hr at an atmospheric concn of 5X10 5 hydroxyl radicals per cu cm .
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| Drinking Water Impact | 260 Unspecified stations in US (323 samples) 0-66.0 ug/l, 0.44 ug/l avg .
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