| Chemical Abstract Number (CAS #) |
115322
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| Synonyms | p,p'-Dicofol |
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Benzenemethanol, 4-chloro-alpha-(4-chlorophenyl)-alpha-(trichloromethyl)- | Kelthane | Dicofol | DTMC | Acarin |
| Analytical Methods |
EPA Method 617 |
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EPA Method 8081 |
| Molecular Formula | C14H9Cl5O |
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| Use | Control of many species of mite on a wide range of crops, incl fruit, vines, ornamentals,
vegetables, & field crops
/Used in or around agricultural and domestic buildings for mite control.
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| Consumption Patterns | On cotton, 50%; on citrus, 29%; deciduous fruits/nuts, 13%; ornamentals, 4%; and in
home and garden applications, 4%, estimated (1978)
ACARICIDE FOR COTTON, 75%; ACARICIDE FOR CITRUS, 17%; ACARICIDE FOR
VEGETABLES, 8% (1982)
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| Apparent Color | COLORLESS SOLID Waxy solid ; Non-flowable liquid (or waxy solid), ranging from
dark to yellow brown in color.
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| Odor | Solids have slight characteristic odor ; Liquid has odor of the solvent (xylene)
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| Boiling Point | 180 deg C @ 0.1 mm Hg
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| Melting Point | 77-78 DEG C
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| Molecular Weight | 370.47
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| Density | 1.130 @ 20 deg C
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| Sensitivity Data | Probable severe eye irritant.
Dust is irritating to nose & throat. Liq or solid is irritating to skin & eyes.
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| Environmental Impact | Dicofol is released to the environment through its manufacture and use as a nonsystemic
acaricide. If released to soil, it will be expected to bind to the soil strongly but under some
circumstances it may reach groundwater, since it has been detected in groundwater. It is
susceptible to hydrolysis in moist soils and evaporation from the surface of moist soils. It may be
resistant to biodegradation. If it is released to water it will be expected to bind to the sediments
and may bioconcentrate in aquatic organisms. It will be subject to hydrolysis and may directly
photodegrade. It may be resistant to biodegradation but may be susceptible to evaporation. If it is
released to the atmosphere it may be subject to direct photolysis. The estimated vapor phase
half-life in the atmosphere is 2.92 days as a result of reaction with photochemically produced
hydroxyl radicals. General exposure to dicofol occurs when kelthane is used and will occur mainly
through consumption of contaminated foods. Dermal, ingestive, and inhalation exposure may also
occur as a result of its manufacture and use as a non-systemic acaricide.
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| Environmental Fate | TERRESTRIAL FATE: If released to soils dicofol will be expected to bind to the soil
based on estimated Koc values and would therefore not be expected to leach extensively to the
groundwater; however, dicofol's reported presence in groundwater samples illustrates that
transport through the soil by some mechanism is possible. It may be susceptible to hydrolysis in
moist soils since it is suceptible to hydrolysis to dichlorobenzophenone in river water. No
information is available concerning the biodegradation of dicofol in soils or its evaporation from
the surface of soils. Dicofol may be resistant to biodegradation and susceptible to evaporation
from moist soils although adsorption to the soil may retard these processes.
AQUATIC FATE: If dicofol is released to water it will be expected to adsorb to the sediment
based on estimated Koc values. It may bioconcentrate in aquatic organisms based on the little
experimental data available; this is in contrast to the estimated BCF values, that suggest that it will
not bioconcentrate. It will be subject to hydrolysis and may directly photodegrade. Although no
data were located concerning the biodegradation or evaporation of dicofol, the behavior of
structurally similar chemicals, such as DDT, suggests that dicofol may be resistant to
biodegradation and susceptible to evaporation in water.
ATMOSPHERIC FATE: If dicofol is released to the atmosphere it may be subject to direct
photolysis since it absorbs light > 290 nm.
TERRESTRIAL FATE: ALTHOUGH RESIDUES IN SOIL DECREASE RAPIDLY, TRACES
MAY REMAIN MORE THAN A YEAR.
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| Drinking Water Impact | DRINKING WATER: Dicofol was identified (not quantified) in well water of selected
California communities . Dicofol was detected in 3 of 38 county water supplies in CA .
GROUNDWATER: Dicofol was detected in groundwater wells from the Miami Drum Services
site, Dade County, FL, 1982, 7 wells, 86% pos, depth 2.4-23 meters, 0.2-1.8 ppb .
SURFACE WATER: Dicofol was reported to be absent from the Lake Huron basin
ecosystem .
EFFL: Up to 0.397 mg/l of dicofol has been detected in industrial wastewater in the USSR.
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