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Chemical Identification
Common Name
Temephos
中文通用名
双硫磷
IUPAC
O,O,O′,O′-tetramethyl O,O′-thiodi-p-phenylene bis(phosphorothioate)
or
O,O,O′,O′-tetramethyl O,O′-thiodi-p-phenylene diphosphorothioate
CAS
O,O′-(thiodi-4,1-phenylene) bis(O,O-dimethyl phosphorothioate)
CAS No.
3383-96-8
Molecular Formula
C16H20O6P2S3
Molecular Structure
Physical Properties
Molecular weight:466.5; Physical form:Colourless crystals; ( tech., brown, viscous liquid). Density:1.32 (tech.); Composition:Tech. grade is >90% pure. Melting point:30.0-30.5 °C; Partition coefficient(n-octanol and water):logP = 4.91; Solubility:In water 0.03 mg/l (25 °C). Soluble in common organic solvents such as diethyl ether, aromatic and chlorinated hydrocarbons. In hexane 9.6 g/l.; Stability:Hydrolysed by strong acids and alkalis (optimum stability is at pH 5-7). Do not store at temperatures above 49 °C.;
Toxicology
Oral:Acute oral LD50 for male rats 4204, female rats >10 000 mg/kg. Percutaneous:Acute percutaneous LD50 (24 h) for rabbits 2181, rats >4000 mg/kg. Non-irritating to eyes and skin. ADI:0.005 mg/kg.
Environmental Profile
Ecotoxicology: 
Bees:Highly toxic by direct contact; LD50 (topical) 1.55 µg/bee.Birds:Dietary LC50 (5 d) for mallard ducks 1200, ring-necked pheasants 170 mg/kg diet.Fish: LC50 for rainbow trout 31.8 mg/l. 

Environmental fate: 
Animals:In mammals, elimination is mainly of unchanged temephos in the faeces and urine. Other principal urinary metabolites are sulfate ester conjugates of 4,4'-thiodiphenol, 4,4'-sulfinyldiphenol, and 4,4'-sulfonyldiphenol (R. C. Blinn, J. Agric. Food Chem.Soil:Soil adsorption Freundlich K 73 (loamy sand), 130 (sandy loam), 244 (silt loam), 541 (loam).Plant:In plants, oxidation to the sulfoxide, and, to a lesser extent, to the sulfone and the mono- and di-orthophosphates. Further degradation proceeds very slowly.
Transport Information
Signal Word:CAUTION; Hazard Class:III(Slightly hazardous)

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