SPECTRUM

Chemical Fact Sheet

Chemical Abstract Number (CAS #) 88857
CASRN 88-85-7
SynonymsDinoseb
2-sec-butyl-4,6-dinitrophenol
Phenol, 2-(1-methylpropyl)-4,6-dinitro-
DNBP
Analytical Methods EPA Method 515.3
EPA Method 555
EPA Method 615
EPA Method 8040
EPA Method 8151
Molecular FormulaC10H12N2O5

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

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
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)
Apparent Color Yellow crystals ; Orange solid
Odor PUNGENT ODOR
Melting Point 38-42 DEG C
Density 1.2647 @ 45 deg C/4 deg C
Sensitivity Data Staining of skin & minor irritation by very small amt. Mild to moderate irritation of eyes/. Inhalation of dusts may be irritating
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.
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.
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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