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Chemical Identification
Common Name
Phosmet
中文通用名
亚胺硫磷
IUPAC
O,O-dimethyl S-phthalimidomethyl phosphorodithioate
or
N-(dimethoxyphosphinothioylthiomethyl)phthalimide
CAS
S-[(1,3-dihydro-1,3-dioxo-2H-isoindol-2-yl)methyl] O,O-dimethyl phosphorodithioate
CAS No.
732-11-6
Molecular Formula
C11H12NO4PS2
Molecular Structure
Physical Properties
Molecular weight:317.3; Physical form:Colourless crystals; ( tech., off-white or pink, waxy solid). Composition:Tech. material is 92% pure. Melting point:72.0-72.7 °C; ( tech., 66-69 °C); Flash point:>106 °C; Vapour pressure:0.065 mPa (25 °C); Henry constant:8.25 × 10-4 Pa m3 mol-1 ( calc.); Partition coefficient(n-octanol and water):logP = 2.95; Solubility:In water 25 mg/l (25 °C). In acetone 650, benzene 600, toluene, methyl isobutyl ketone 300, xylene 250, methanol 50, kerosene 5 (all in g/l, 25 °C).; Stability:Rapidly hydrolysed in alkaline media; relatively stable in acidic conditions; DT50 (20 °C) 13 d ( pH 4.5), <12 h ( pH 7), <4 h ( pH 8.3). Decomposes rapidly above 100 °C. Decompose.
Toxicology
Oral:Acute oral LD50 for male rats 113, female rats 160 mg/ kg. Percutaneous:Acute percutaneous LD50 for albino rabbits >5000 mg/ kg; mild skin and eye irritant (rabbits). Not a skin sensitiser (guinea pigs). Inhalation: LC50 (4 h) for male and female rats 1.6 mg 70% WP/l air. ADI:( JMPR) 0.02 mg/ kg b.w. [1997].
Environmental Profile
Ecotoxicology: 
Bees: LD50 0.001 mg/bee.Birds: LC50 (5 d) for bobwhite quail 507, mallard ducks >5000 mg/ kg diet.Daphnia: LC50 (48 h) 8.5µg/l.Fish: LC50 (96 h) for bluegill sunfish 0.07, rainbow trout 0.23 mg/l. 

Environmental fate: 
Animals:In animals, rapid metabolism occurs to phthalamic acid, phthalic acid, and phthalic acid derivatives, which have been isolated from urine as phosmet metabolites (J. B. McBain et al., J. Agric. Food Chem., 1968, 16
Transport Information
Signal Word:WARNING; Hazard Class:II(Moderately hazardous)

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