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Chemical Identification
Common Name
Coumaphos
中文通用名
蝇毒磷
IUPAC
O-3-chloro-4-methyl-2-oxo-2H-chromen-7-yl O,O-diethyl phosphorothioate
or
3-chloro-7-diethoxyphosphinothioyloxy-4-methylcoumarin
CAS
O-(3-chloro-4-methyl-2-oxo-2H-1-benzopyran-7-yl) O,O-diethyl phosphorothioate
CAS No.
56-72-4
Molecular Formula
C14H16ClO5PS
Molecular Structure
Physical Properties
Molecular weight:362.8; Physical form:Colourless crystals. Density:1.474 (20 °C).; Melting point:95 °C; (tech., 90-92 °C); Vapour pressure:0.013 mPa (20 °C); Henry constant:3.14×10-3 Pa m3 mol-1 (calc.); Partition coefficient(n-octanol and water):logP = 4.13; Solubility:In water 1.5 mg/l (20 °C). Limited solubility in organic solvents.; Stability:Stable to hydrolysis in aqueous media, though in dilute alkali the pyrone is opened, reclosing on acidification.
Toxicology
Oral:Acute oral LD50 for male rats 41, female rats 16 mg/kg (in peanut oil). Percutaneous:Acute percutaneous LD50 for male rats 860 mg/kg. Inhalation:LC50 (1 h) for male rats >1081, female rats 341 mg/m3 air.
Environmental Profile
Ecotoxicology: 
Birds:LD50 for bobwhite quail 4.3, mallard ducks 29.8 mg/kg. Daphnia:LC50 (48 h) 1.0 μg/l.Fish:LC50 (96 h) for bluegill sunfish 340, channel catfish 840 μg/l. Environmental fate: 
Soil:Photolytic DT50 on soil surface 23.8 d. Kd 61-298, Koc 5778-21 120 (4 soil types).
Transport Information
Hazard Class:Ia (Extremely hazardous)

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