| Chemical Abstract Number (CAS #) |
88857
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| Synonyms | Dinoseb |
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2-sec-butyl-4,6-dinitrophenol | Phenol, 2-(1-methylpropyl)-4,6-dinitro- | DNBP |
| Analytical Methods |
EPA Method 515.1 |
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EPA Method 515.2 |
EPA Method 555 |
EPA Method 615 |
EPA Method 8040A |
EPA Method 8150B |
EPA Method 8151 |
| Molecular Formula | C10H12N2O5 |
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| Use | Miticide Former use
Insecticide or ovicide but must be used in the dormant growth season or as a salt form to reduce
toxicity. Herbicide for preemergence treatment. Former use
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| Consumption Patterns | HERBICIDE FOR SOYBEANS, 32%; VEGETABLES, 23%; DECIDUOUS FRUITS &
NUTS, 11%; PEANUTS, 8%; CITRUS, 3%; GRAIN CROPS, 2%; OTHER FIELD CROPS,
6%; INDUSTRIAL/COMMERCIAL USES, 15%. (1982)
Soybeans, 40%; cotton, 15%; potatoes, 16%; peanuts, 9%; alfalfa, 4%; snap beans, 2%; peas,
2%; grapes, 2%; & almonds, 1% (1986; major use sites by volume)
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| Apparent Color | Yellow crystals ; Orange solid
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| Odor | PUNGENT ODOR
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| Melting Point | 38-42 DEG C
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| Density | 1.2647 @ 45 deg C/4 deg C
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| Sensitivity Data | Staining of skin & minor irritation by very small amt. Mild to moderate irritation of
eyes/. Inhalation of dusts may be irritating
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| Environmental Impact | Release of dinoseb has resulted primarily from its use as an herbicide on a variety of
weeds. Release of dinoseb to soil is expected to result in biodegradation and dinoseb will only
weakly adsorb to soils and should, therefore, leach to groundwater. However, it may bind more
strongly to clay soils, especially at acidic pH. Photolytic degradation of dinoseb from soil surface
may be important. Dinoseb may photodegrade in surface water with a half-life of 14-18 days.
Hydrolysis in water may not be important. It is unlikely to undergo significant biodegradation in
most natural waters. Volatilization from water is expected to be slow and bioconcentration is
expected to be insignificant. The half-life for the reaction of vapor phase dinoseb with
photochemically generated hydroxyl radicals in the atmosphere was estimated to be 14.1 days.
Wet deposition may remove some of the compound from air. Exposure to dinoseb in humans is
expected to occur primarily in workers using the herbicide.
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| Environmental Fate | TERRESTRIAL FATE: WATER-SOLUBLE SALTS OF DINOSEB LEACH
READILY IN SOIL. HOWEVER, OIL-SOLUBLE OR WATER-MISCIBLE
FORMULATIONS OF DINOSEB MOVED MUCH LESS THAN WATER-SOLUBLE
FORMULATIONS.
TERRESTRIAL FATE: Dinoseb is expected to biodegrade in slowly soil. It should bind weakly
to soil. Therefore, leaching in soil is possible and dinoseb has been detected in groundwater.
However, it may bind more strongly to clay soils, specialy at acidic pH. Photolytic degrdration of
dinoseb from soil surface may be important. Volatilization is not expected to be significant. In the
absence of volatilization, the half-life of dinoseb in the vadose zone sandy loam soil was estimated
to be about 100 days .
AQUATIC FATE: Dinoseb may photodegrade in surface water with a half-life of 14-16 days .
Hydrolysis in water may not be important . Volatilization and adsorption to sediments are not
expected to be significant. It is unlikely to undergo significant biodegradation in most natural
waters.
ATMOSPHERIC FATE: Based on its vapor pressure of 8.5X10-2 mm Hg at 20 deg C ,
dinoseb may exist entirely in the vapor phase in the atmosphere . The half-life for the reaction of
vapor phase dinoseb with photochemically generated hydroxyl radicals in the atmosphere was
estimated to be 4.1 days . Due to its water solubility of 52 mg/L at 25 deg C , some of the
atmospheric dinoseb may be removed by wet deposition.
RESULTANT AVERAGE PERSISTENCE OF PHYTOTOXICITY @ RECOMMENDED
RATES: 2 TO 4 WK UNDER AVERAGE CONDITIONS OF USE.
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| Drinking Water Impact | GROUNDWATER: OVER 10 YR 1969-1978, WATERS OF WELLS IN ONTARIO,
CANADA WERE ANALYZED BECAUSE OF CONTAMINATION FROM HERBICIDE
SPILLAGE IN OR NEAR THE WELL, COMPLAINTS OF IMPAIRED WATER FLAVOR,
OR INJURY TO SEEDLING PLANTS MOISTENED WITH WELL WATER. ONE OF THE 3
PARTICULARLY PERSISTENT CONTAMINANTS WAS DINOSEB.
GROUNDWATER: Detected in groundwater of Long Island, NY at concn range 1-5 ug/L .
The concn of dinoseb in well water 182 days following a spill was 13 mg/L and was over 3000
mg/L after 382 days of spill . Qualitatively detected in 11 groundwater samples in CA and 2
groundwater samples in WI . It was also detected in groundwater samples in ME, MA and
OR(6). In 3 states in US, its median concn in groundwater was 0.7 ug/L with a max concn of 36.7
ug/L(7).
SURFACE WATER: If was found at a concn of 1 ug/L in a Ohio surface water out of 89 surface
waters collected from different locations . Dinoseb was consistently found in ditch water at
farms in British Columbia, Canada at concn from not detected to 20 ug/L .
EFFL: Dinoseb was detected at a max concn of 44 ug/L in the agricultural drainage water from
potatoe fields in Northwestern New Brunswick, Canada .
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