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Chemical Identification
Common Name
Phorate
中文通用名
甲拌磷
IUPAC
O,O-diethyl S-ethylthiomethyl phosphorodithioate
CAS
O,O-diethyl S-[(ethylthio)methyl] phosphorodithioate
CAS No.
298-02-2
Molecular Formula
C7H17O2PS3
Molecular Structure
Physical Properties
Molecular weight:260.4; Physical form:Colourless liquid ( tech.). Density:1.167 ( tech., 25 °C); Composition:Tech. phorate is >90% pure. Melting point:<-15 °C ( tech.); Flash point:>110 °C (Setaflash closed cup); Vapour pressure:85 mPa (25 °C); Henry constant:5.9 × 10-1 Pa m3 mol-1 (calc.); Partition coefficient(n-octanol and water):logP = 3.92; Solubility:In water 50 mg/l (25 °C). Miscible with alcohols, ketones, ethers, esters, aromatic, aliphatic and chlorinated hydrocarbons, dioxane, vegetable oils, and other organic solvents.; Stability:Stable under normal storage conditions for at least 2 years. Aqueous solutions degraded by light ( DT50 1.1 d); stability to hydrolysis optimum at pH 5-7, DT50 3.2 d.
Toxicology
Oral:Acute oral LD50 for male rats 3.7, female rats 1.6, mice c. 6 mg/kg. Percutaneous:Acute percutaneous LD50 for male rats 6.2, female rats 2.5, guinea pigs 20-30, male rabbits 5.6, female rabbits 2.9 mg/kg. Values for GR depend on a.i. content, carrier, test method and animal sp Inhalation: LC50 (1 h) for male rats 0.06, female rats 0.011 mg/l. Phytotoxicity:Phytotoxic to apples and tobacco. Phytotoxicity is possible in beet, carrots, beans, maize, an
Environmental Profile
Ecotoxicology: 
Bees:Toxic to bees; LD50 (topical) 10µg/bee.Birds:Acute oral LD50 for mallard ducks 0.62, ring-necked pheasants 7.1 mg/ kg.Fish: LC50 (96 h) for rainbow trout 0.013, channel catfish 0.28 mg/l. 

Environmental fate: 
Animals:In animals, phorate is metabolically oxidised to the sulfoxide and sulfone, and their phosphorothioate analogues, followed by hydrolysis to dithio-, thio-, and orthophosphoric acids.Soil:In soil, metabolic oxidation gives the sulfoxide and sulfone, and their phosphorothioate analogues, and these then undergo hydrolysis, although the sulfone can persist under certain conditions (D. L. Suett, Pestic. Sci., 1975, 6,Plant:Degradation is similar to that in animals. WATER SOLUBILITY: 50 mg/l at 25°C .
Transport Information
Hazard Class:Ia(Extremely hazardous)

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