Chemical Fact Sheet

Chemical Abstract Number (CAS #) 116290
CASRN 116-29-0
Benzene, 1,2,4-trichloro-5-[(4-chlorophenyl)sulfonyl]-
4-Chlorophenyl 2,4,5-trichlorophenyl sulfone
Aracnol K
Molecular FormulaC12H6Cl4O2S

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

Use ACARICIDE; OVICIDE ON DECIDUOUS FRUITS, CITRUS, COTTON & OTHER CROPS. INSECTICIDE SMOKE GENERATORS. Control of eggs and young active stages of phytophagous mites on fruit trees (including citrus and nuts), vines, vegetables, ornamentals, cotton, hops, coffee, tea, and rice. A food additive permitted in food for human consumption.
Melting Point 146.5 - 147.5 deg C
Molecular Weight 356.06
Density 1.515 @ 20 deg C
Environmental Impact Tetradifon may be released to the environment during airblast spraying of fruit orchards and other crops such as cotton. If released to the atmosphere, tetradifon may exist in both the vapor and particulate-phases. Vapor-phase tetradifon in the ambient atmosphere is expected to slowly degrade by reaction with photochemically produced hydroxyl radicals (estimated half-life of 44 days). Particulate-phase tetradifon may be removed from air via dry deposition. If released to soil, tetradifon is expected to be immobile in soil and adsorption to soil will be important. Photolysis will not be important on soil surfaces exposed to sunlight. Based on one persistence study and one anaerobic study, biodegradation should be a slow process in soil and water. If released to water, adsorption from the water column to sediment and suspended materials and bioconcentration in fish will be important. Volatilization from water is not expected to be important. Exposure of the general population to tetradifon may occur through ingestion of contaminated foods as well as inhalation of dust and dermal contact resulting from spraying nearby fruit orchards. Workers may be exposed to tetradifon via dermal contact and inhalation of dust.
Environmental Fate TERRESTRIAL FATE: Adsorption of tetradifon to soil will be important based on high estimated Kocs of >8,000(1-3,SRC). One persistence study indicated that 81% of tetradifon applied to an orchard with loamy soil (3.1% organic content, pH 7.4 and 26% clay) persisted for a minimum of 6 months; post application time was not given and samples were collected in the summer of 1967 and tested in 1968 . Tetradifon did not persist in silty clay (4.9% organic content, pH 7.4 and 42% clay) approximately 2 yrs postapplication . Incubation of tetradifon with inocula of rumina bacteria or ciliated protozoa under anaerobic conditions suggests that tetradifon is not nutritionally used for growth of the organism and that this compound does not stimulate endogenous gas production . AQUATIC FATE: An estimated BCF value of about 2,000(1-2,SRC) for tetradifon suggests that bioconcentration in fish will be important. Volatilization from water will not be important based on a low estimated Henry's Law constant of 7.5X10-8 atm-cu m/mole at 25 deg C . Adsorption of tetradifon to sediment will be important based on high estimated Kocs of >8,000(1,2,4,SRC). Based on a persistence study in soil , biodegradation of tetradifon in water may not be an imporatant fate process. ATMOSPHERIC FATE: Based on an experimental vapor pressure of 2.4X10-7 mm Hg at 20 deg C , tetradifon will exist in both the vapor- and particulate-phases in the ambient atmosphere . Vapor-phase tetradifon is slowly degraded in the ambient atmosphere by reaction with photochemically formed hydroxyl radicals; the half-life for this reaction in air can be estimated to be about 44 days(1,SRC). Particulate-phase tetradifon is stable in sunlight and may be removed via dry deposition.
Drinking Water Impact SURFACE WATER: Tetradifon was qualitatively detected from natural waters beside the Mediterranean Sea in November of 1984 . Tetradifon was qualitatively detected in Green Bay and the Fox River, two aquatic systems in the Lake Michigan water basin .

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