Chemical Identification
Common Name
Orbencarb
中文通用名
坪草丹
IUPAC
S-2-chlorobenzyl diethyl(thiocarbamate)
CAS
S-[(2-chlorophenyl)methyl] diethylcarbamothioate
CAS No.
34622-58-7
Molecular Formula
C12H16ClNOS
Molecular Structure
Category
Activity
Herbicide
Premix
Emulsifiable concentrate. Premix Parters: captan; captan diazinon; carbaryl; carboxin diazinon; carboxin maneb; diazinon; mancozeb; maneb; pyrethrins;
Physical Properties
Molecular weight:257.8g/mol; Physical form:Colourless liquid; ( tech., yellowish liquid). Density:1.176 (20 ℃); Composition:Tech. is >95%. Melting point:9.0 ℃; Vapour pressure:12.4 mPa (20 ℃); Henry constant:1.33 ×10-1 Pa m3 mol-1 ( calc.); Partition coefficient(n-octanol and water):logP = 3.43; Solubility:In water 24 mg/l (20-27℃). Very soluble in organic solvents, e.g. acetone, xylene, hexane, ethanol and benzene >1 kg/l (room temperature).; Stability:Stable to hydrolysis 60 d at pH 5 to pH 9 (20℃). Slightly decomposed by sunlight in aqueous solution.
Toxicology
Oral:Acute oral LD50 for male rats 800, female rats 820, male mice 935, female mice 1010 mg/ kg. Percutaneous:Acute percutaneous LD50 for rats >10 000 mg/kg. Not a skin or eye irritant (rabbits). Inhalation: LC50 (4 h) for male rats 4.32, female rats 2.94 mg/l air. ADI:( JMPR) ADI withdrawn [1996].
Environmental Profile
Ecotoxicology:
Algae: LC50 (96 h) 5 mg/l.Bees:Not toxic to bees. Acute oral LD50 103 μg/bee.Birds:Acute oral LD50 for bobwhite quail and mallard ducks >2000 mg/ kg b.w.Daphnia: LC50 (24 h) 2.88 mg/l.Fish: LC50 (48 h) for carp 3.4 mg/l; (96 h) for rainbow trout 1.88 mg/l.

Environmental fate:
Animals:For metabolism in rats, see T. Unai et al., J. Pestic. Sci., 1986, 11, 527.Soil:For degradation in soil, see T. Unai et al., ibid.Plant:In plants, undergoes relatively rapid degradation. By harvest time, the residue levels are below the limits of detection. For metabolism in soya bean plants, see T. Unai et al., ibid. WATER SOLUBILITY: 23.9 mg/l at 27
Transport Information
Signal Word:CAUTION; Hazard Class:III(Slightly hazardous)

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