|Chemical Abstract Number (CAS #)||
|Synonyms||Tetradifon||Benzene, 1,2,4-trichloro-5-[(4-chlorophenyl)sulfonyl]-||Tedion||4-Chlorophenyl 2,4,5-trichlorophenyl sulfone||Aracnol K||Rotetra||Akaritox||Duphar
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
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.
|Apparent Color|| COLORLESS CRYSTALLINE SOLID; CRYSTALS FROM BENZENE; White,
|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
|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 .