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Chemical Identification
Common Name
Chlormephos
中文通用名
氯甲硫磷
IUPAC
S-chloromethyl O,O-diethyl phosphorodithioate
CAS
S-(chloromethyl) O,O-diethyl phosphorodithioate
CAS No.
24934-91-6
Molecular Formula
C5H12ClO2PS2
Molecular Structure
Physical Properties
Molecular weight:234.7; Physical form:Colourless liquid. Density:1.260 (20 °C); Vapour pressure:7.6×103 mPa (30 °C); Solubility:In water 60 mg/l (20 °C). Miscible with most organic solvents.; Stability:Stable in neutral and weakly acidic media at room temperature, but hydrolysed by dilute acids and alkalis at 80 °C. Rapidly hydrolysed in alkaline media. Soluble in most organic solvents.
Toxicology
Oral:Acute oral LD50 for rats 7 mg/kg. Percutaneous:Acute percutaneous LD50 for rats 27 mg/kg; for rats and rabbits >1600 mg(as 5% GR)/kg. Phytotoxicity:Non-phytotoxic when used as directed. Sorghum and soya beans may be injured.
Environmental Profile
Ecotoxicology: Bees:Toxic to bees.Birds:Acute oral LD50 for quail 260 mg/kg.Fish:Toxic to fish. LC50 for harlequin fish 1.5 mg/l.Bee: Toxic Environmental fate: Animals:In rats, following oral administration, there is almost complete elimination within 24 hours in the urine as diethyl phosphate and diethyl phosphorothioate.Soil:In soil, chlormephos is converted to ethion. WATER SOLUBILITY: Slightly soluble
Transport Information
Signal Word:DANGER-POISON; Hazard Class:Ia (Extremely hazardous)

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