| Chemical Abstract Number (CAS #) |
3689245
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| CASRN |
3689-24-5 |
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;
| Synonyms | Sulfotepp |
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Tetraethyldithiopyrophosphate | Bladafum | Dithiopyrophosphoric acid, tetraethyl ester | Thiopyrophosphoric acid ([(HO)2P(S)]2O), tetraethyl ester |
| Analytical Method |
EPA Method 8141 |
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| Molecular Formula | C8H20O5P2S2 |
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Link to the National Library of Medicine's Hazardous Substances
Database for more details
on this compound. |
| Use | INSECTICIDE; ACARICIDE
GREENHOUSE FUMIGANT TO CONTROL APHIDS, SPIDER MITES, THRIPS, &
WHITEFLIES.
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| Apparent Color | COLORLESS OIL ; PALE YELLOW LIQUID
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| Odor | GARLIC ODOR
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| Boiling Point | 136-139 DEG C @ 2 MM HG
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| Melting Point | 88 deg C
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| Molecular Weight | 322.32
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| Density | 1.196 @ 25 DEG C/4 DEG C
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| Environmental Impact | Dithion was used as an insecticide primarily in the fumigation of greenhouses. Dithion
may have entered the atmosphere as a result of fugitive emissions during its manufacture and
formulation, and also during its application. If released to soil, it can be expected to display low
mobility. Neither hydrolysis, nor volatilization from the soil surface to the atmosphere are
expected to be significant fate processes. If released to water, dithion can be expected to adsorb
to sediment and suspended organic matter. Volatilization may be a significant process; the
volatilization half-life from a model river can be estimated to be 23 days. Adsorption, however,
may attenuate this process. Direct photolysis in pure water has not been observed, yet the addition
of 10 mg/l of humic acid results in a half-life of 28.4 hr under laboratory conditions. Hydrolysis of
dithion in water is not expected to be a significant process. In the atmosphere, dithion can be
expected to exist predominately in the vapor phase. The half-life for the gas phase reaction of
dithion with photochemically produced hydroxyl radicals can be estimated to be 2.2 hours; thus, it
is expected to be a dominant fate process. Direct photochemical degradation is not expected to be
significant. In the absence of other atmospheric removal processes, rain washout may occur.
Occupational exposure to dithion may occur by dermal contact or inhalation during its
manufacture and formulation, and during the fumigation of greenhouses with this insecticide. The
general population may be exposed by ingestion since this pesticide has been found in leaf and
stem vegetables.
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| Environmental Fate | TERRESTRIAL FATE: If released to soil, dithion would not be expected to leach
through soil, as a Koc of 749 suggests only low mobility in soil . Hydrolysis is not expected
to be a significant fate process . Based on the estimated Henry's Law constant 2.9X10-6 atm
cu-m/mol at 20 deg C(4,5,SRC), volatilization from the soil surface to the atmosphere may occur,
but it is not expected to be a rapid process.
AQUATIC FATE: If released to water a reported Koc estimate of 740 suggests that dithion is
expected to adsorb to sediment and suspended organic matter(2,SRC). The estimated
volatilization half-life for a model river 1 m deep, flowing at 1 m/sec, and a wind velocity of 3
m/sec is 23 days(3,SRC). Adsorption to sediment and suspended organic matter can be expected
to attenuate this process. Hydrolysis is not expected to be a significant fate
process(4,SRC).
ATMOSPHERIC FATE: If released to the atmosphere, dithion can be expected to exist almost
entirely in the vapor phase . Rapid destruction by the gas phase reaction with photochemically
produced hydroxyl radicals is expected to be the dominant fate process; the half life for this
reaction can be estimated to be 2.2 hours(2,SRC). Direct photochemical degradation is not
expected to be a significant fate process based upon a lack of reaction in distilled water (3,SRC).
Based on the water solubility, 25 mg/l at room temperature , wet deposition may occur in the
absence of other removal mechanisms.
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