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Chemical Identification
Common Name
Vamidothion
中文通用名
蚜灭磷
IUPAC
O,O-dimethyl S-(RS)-2-(1-methylcarbamoylethylthio)ethyl phosphorothioate
or
(RS)-2-(2-dimethoxyphosphinoylthioethylthio)-N-methylpropionamide
CAS
O,O-dimethyl S-[2-[[1-methyl-2-(methylamino)-2-oxoethyl]thio]ethyl] phosphorothioate
CAS No.
2275-23-2
Molecular Formula
C8H18NO4PS2
Molecular Structure
Physical Properties
Molecular weight:287.3 g/mol; Physical form:Colourless needles; (tech, white, waxy solid). Melting point: 43℃; (tech, 40℃); Vapour pressure:Negligible (20℃); Solubility:Readily soluble in water (4 kg/l), benzene, toluene, methyl ethyl ketone, ethyl acetate, acetonitrile, dichloromethane, cyclohexanone, chloroform (all c. 1 kg/l). Almost insoluble in cyclohexane and petroleum eth; Stability:Undergoes slight decomposition at room temperature, but solutions in organic solvents (methyl ethyl ketone, cyclohexanone) are stable. Decomposed in strong acidic or alkaline media.
Toxicology
Oral Acute oral LD50 for male rats 100-105, female rats 64-67, mice 34-37 mg/kg.For the sulfoxide, acute oral LD50 for male rats 160, mice 80 mg/kg.Skin and eye Acute percutaneous LD50 for mice 1460, rabbits 1160 mg/kg.
Environmental Profile
Ecotoxicology
Birds Acute oral LD50 for pheasants 35 mg/kg. Fish LC50 (96 h) for zebra fish 590 mg/l. At 10 mg/l, harmless to goldfish (14 d).Daphnia EC50(48 h) 0.19 mg/l.Bees Toxic to bees.
Environmental fate
Animals Oxidised to the sulfoxide and sulfone, followed by cleavage of the P-S and S-C bonds, to give water-soluble metabolites.Plants Metabolised in plants to the corresponding sulfoxide, which appears within hours after treatment. Also demethylation and hydrolysis to phosphoric acid. After 20 d, all the toxic residues in the plant are in the form of the sulfoxide.Soil/Environment In soil, DT50 1.0-1.5 d (aerobic, 22 oC).
Transport Information
Signal Word:DANGER; Hazard Class:Ib(Highly hazardous)

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