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Chemical Identification
Common Name
Methamidophos
中文通用名
甲胺磷
IUPAC
(RS)-(O,S-dimethyl phosphoramidothioate)
CAS
O,S-dimethyl phosphoramidothioate
CAS No.
10265-92-6
Molecular Formula
C2H8NO2PS
Molecular Structure
Category
Activity
Acaricide/Miticide
Premix
Methomyl+methamidophos
Methamidophos+parathion-methyl
Physical Properties
Molecular weight:141.1; Physical form:Colourless crystals, with a mercaptan-like odour. Density:1.27 (20 °C); Melting point:44.9 °C; ( tech., 20-25 °C); Flash point:66 °C ( EU A9/ASTN-D56); Vapour pressure:2.3 mPa (20 °C); 4.7 mPa (25 °C); Henry constant:<1.6 × 10-6 Pa m3 mol-1 (calc., 20 °C); Partition coefficient(n-octanol and water):logP = -0.8 (20 °C); Solubility:In water >200 g/l (20 °C). In isopropanol >200, dichloromethane >200, hexane 0.1-1, toluene 2-5 (all in g/l, 20 °C).; Stability:Stable at ambient temperature, but decomposes on heating without boiling. Stable at pH 3-8. Hydrolysed in acids and alkalis, DT50 (22 °C) 1.8 y ( pH 4), 120 h ( pH 7), 70 h;
Toxicology
Oral:Acute oral LD50 for male rats 15.6, female rats 13.0 mg/kg. Percutaneous:Acute percutaneous LD50 for male rabbits 122, female rabbits 69 mg/kg. Not irritating to skin; slightly irritating to eyes (rabbits). Not a skin sensitiser. Inhalation: LC50 (4 h) for male and female rats (nose only) 213 mg/m3. ADI:0.05 mg/ kg b.w.
Environmental Profile
Ecotoxicology: 
Algae: ErC50 (96 h, static) for Scenedesmus subspicatus >178 mg/l.Bees:Toxic to bees.Birds:Acute oral LD50 for bobwhite quail 10 mg/kg. Dietary LC50 (5 d) for mallard ducks 1302 ppm.Daphnia: EC50 (48 h) 0.27 mg/l.Fish: LC50 (96 h) for rainbow trout (static) 25 ppm, bluegill sunfish (static) 34 ppm, sheepshead minnow 5.6 mg/l.Worms: LC50 (14 d) for Eisenia foetida 34 mg/ kg dry soil. 

Environmental fate: 
Animals:In rats and farm animals, radiolabelled methamidophos was absorbed rapidly and distributed uniformly among all organs and tissues. More than half of the radioactivity was rapidly eliminated from the body, mainly via urine and respiratory air. RadioactivitSoil:Rapidly degraded in soil; field DT50 c. <2 d. In water, DT50 5-27 d ( pH 7); photolysis may contribute to degradation. Rapidly degraded in air, DT50 Plant:After treatment with methamidophos via the roots, the a.i. was taken up rapidly and translocated into the leaves with the transpiration flow.
Transport Information
Signal Word:DANGER; Hazard Class:Ib(Highly hazardous)

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