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Chemical Identification
Common Name
methyl 2-(dimethylamino)-N-[[(methylamino)carbonyl]oxy]-2-oxoethanimidothioate
Molecular Formula
Molecular Structure
Physical Properties
Molecular weight:219.3g/mol; Physical form:Colourless crystals, with a garlic-like odour. Density:0.97 at 25 ℃; Melting point:At 100-102℃, changes to a dimorphic form which melts at 108-110℃; Vapour pressure:0.051 (25℃); Henry constant:3.9 × 10-8 Pa m3 mol-1; Partition coefficient(n-octanol and water):logP = -0.44 ( pH 5); Solubility:In water 280 g/l (25℃). In methanol 1440, ethanol 330, acetone 670, toluene 10 (all in g/ kg, 25℃).; Stability:Solid and formulations are stable; aqueous solutions decompose slowly; DT50 >31 d ( pH 5), 8 d ( pH 7), 3 h ( pH 9); accelerated by aeration and sunlight.
Oral:Acute oral LD50 for male rats 3.1, female rats 2.5 mg/ kg. Percutaneous:Acute percutaneous LD50 for male rabbits 5027, female rabbits >2000 mg/kg. Not irritating to skin, not a skin sensitiser on guinea pigs. Inhalation: LC50 (1 h) (atomised spray) for male rats 0.17, female rats 0.12 mg/l air. Phytotoxicity:Non-phytotoxic when used as directed. Some strawberry varieties may be injured.
Environmental Profile
Algae: EC50 (72 h) 3.3 mg/l ( tech.).Bees:Toxic to bees; LD50 (oral) 0.078-0.11μg/bee (as 'Vydate'); (contact) 0.27-0.36μg/bee.Birds:Acute oral LD50 for male mallard ducks 3.83, female mallard ducks 3.16 mg/kg. Dietary LC50 (8 d) for bobwhite quail 340, mallard ducks 766 ppm.Daphnia: LC50 (48 h) 0.319 mg/l.Fish: LC50 (96 h) for bluegill sunfish 5.6, goldfish 27.5, rainbow trout 4.2 mg/l.Worms: LC50 (14 d) 112 ppm.

Environmental fate:
Animals:In rats, oxamyl was hydrolysed to an oximino metabolite (methyl N-hydroxy-N',N'-dimethyl-1-thiooxamimidate) or converted enzymically via N,N-dimethyl-1-cyanoformamide to N,N-dimethyloxamic acid. Conjugates of the oximinSoil:Degraded rapidly in soil, DT50 c. 7 d. DT50 in groundwater (lab. study) 20 d (anaerobic), 20-400 d (aerobic) (J. H. Smelt et al., Pestic. Sci., 1983, 14
WATER SOLUBILITY: 28 g/100 g.m SOIL PARTICLE ADSORPTION: Rapid degradation in soil HAZARDS: Fish: LC50 (96 h) (bluegill) 5.6 mg/l. Bee: Toxic
Transport Information
Signal Word:DANGER-POISON; Hazard Class:Ia(Extremely hazardous)

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