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Chemical Identification
Common Name
Pyraclofos
中文通用名
吡唑硫磷
IUPAC
(RS)-[O-1-(4-chlorophenyl)pyrazol-4-yl O-ethyl S-propyl phosphorothioate]
CAS
O-[1-(4-chlorophenyl)-1H-pyrazol-4-yl] O-ethyl S-propyl phosphorothioate
CAS No.
77458-01-6,89784-60-1
Molecular Formula
C14H18ClN2O3PS
Molecular Structure
Physical Properties
Molecular weight:360.8; Physical form:Pale yellow oil. Density:1.271 (28 °C); Vapour pressure:1.6 ×10-3 mPa (20 °C); Henry constant:1.75 × 10-5 Pa m3 mol-1 (calc.); Partition coefficient(n-octanol and water):logP = 3.77 (20 °C); Solubility:In water 33 mg/l (20 °C). Miscible with most organic solvents.; Stability:On hydrolysis, DT50 (25 °C, pH 7) 29 d.
Toxicology
Oral:Acute oral LD50 for male and female rats 237, male mice 575, female mice 420 mg/ kg. Percutaneous:Acute percutaneous LD50 for rats >2000 mg/kg. Non-irritating to eyes and skin (rabbits). Not a skin sensitiser (guinea pigs). Inhalation: LC50 for male rats 1.69, female rats 1.46 mg/l. Phytotoxicity:Pyraclofos is slightly phytotoxic to fruit trees such as apple, Japanese pear, peach, and citrus, depending on varieties, stages and climatic conditions. ADI:0.0
Environmental Profile
Ecotoxicology: 
Bees: LD50 (contact) for honeybees 0.953µg/bee.Birds: LC50 for bobwhite quail 164, mallard ducks 348 mg/ kg diet.Fish: LC50 (72 h) for carp 0.028, Japanese killifish 1.9 mg/l.Other aquatic spp.: LC50 (3 h) for Moina macrocopa 0.052 mg/l. 

Environmental fate: 
Animals:In rats, following oral administration, >90 % of the dose is eliminated within 24 hours, principally in the urine.Soil: DT50 in soil 3-38 d, depending on soil type. WATER SOLUBILITY: 33 mg/l at 20° C
Transport Information
Signal Word:WARNING; Hazard Class:II(Moderately hazardous)

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