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Chemical Identification
Common Name
Pirimicarb
中文通用名
抗蚜威
IUPAC
2-dimethylamino-5,6-dimethylpyrimidin-4-yl dimethylcarbamate
CAS
2-(dimethylamino)-5,6-dimethyl-4-pyrimidinyl dimethylcarbamate
CAS No.
23103-98-2
Molecular Formula
C11H18N4O2
Molecular Structure
Category
Activity
Aphicide
Premix
Imidacloprid+pirimicarb
Lambda-cyhalothrin+pirimicarb
Aerosol, dispersible grain, dispersible powder, emulsifiable concentrate, smoke generator, ULV spray. Premix Parters: daimuron; dimethametryn; dimethametryn esprocarb pyrazosulfuron-ethyl; pyrazosulfuron-ethyl;
Physical Properties
Molecular weight:238.3; Physical form:White solid. Density:1.18 (25 °C); tech. 1.21 (25 °C); Composition:Tech. material is 95% pure. Melting point:91.6 °C; Vapour pressure:4 × 10-1 mPa (20 °C, by interpolation); Henry constant:3.6 10-5 Pa m3 mol-1 ( calc.); Partition coefficient(n-octanol and water):logP = 1.7 (unionised); pKa:4.44 (20 °C), weak base; Solubility:In purified water 3.0 g/l (20 °C). In acetone, methanol, xylene >200 g/l (20 °C).; Stability:Stable under normal storage conditions for more than 2 years. Hydrolytically stable at pH 4-9 (25 °C). Aqueous solutions are unstable to u.v. light; DT50 <1 d ( pH 5, 7 or 9).
Toxicology
Oral:Acute oral LD50 for female rats 142, mice 107, dogs 100-200 mg/ kg. Percutaneous:Acute percutaneous LD50 for rats >2000, rabbits >500 mg/kg. Non-irritating to skin; mild irritant to eyes (rabbits). Moderate skin sensitiser (guinea pigs M & K). Inhalation: LC50 (4 h) for female rats 0.86 mg/l.
Environmental Profile
Ecotoxicology: 
Algae: EC50(96 h) 140 mg/l.Bees:Not toxic to bees. LD50(24 h) (oral) 4µg/bee ( tech.); (contact) 53µg/bee ( tech.).Birds:Acute oral LD50for poultry 25-50, mallard ducks 28.5, bobwhite quail 20.9 mg/ kg.Daphnia: EC50(48 h) 0.017 mg/l.Fish:LC50(96 h) for rainbow trout 79, bluegill sunfish 55, fathead minnow >100 mg/l.Worms:LC50(14 d) >60 mg/ kg.Other aquatic spp.: EC50(48 h) for Lymnaea stagnalis 19, Gammarus pulex 48, Chironomus riparius 60 mg/l.Other beneficial spp.:Not toxic to Collembola (J. A. Wiles & G. K. Frampton, Pestic. Sci., 47, 273 (1996)). 

Environmental fate:
 Animals:In mammals, the major metabolites are 2-dimethylamino-5,6-dimethyl-4-hydroxypyrimidine, 2-methylamino-5,6-dimethyl-4-hydroxypyrimidine, 2-amino-5,6-dimethyl-4-hydroxypyrimidine and 2-dimethylamino-6-hydroxymethyl-5-methyl-4-hydroxypyrimidine.Soil:For details of degradation in soil, see I. R. Hill, ACSSymp. Series, 1976, 29, 358. DT50in soil 7-234 d, according to soil type. WATER SOLUBILITY: 0.27% HAZARDS: Fish, Bee: Nontoxic
Transport Information
Signal Word:WARNING; Hazard Class:II(Moderately hazardous)

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