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Chemical Identification
Common Name
Dithiopyr
中文通用名
氟硫草定
IUPAC
S,S′-dimethyl 2-difluoromethyl-4-isobutyl-6-trifluoromethylpyridine-3,5-dicarbothioate
CAS
S,S′-dimethyl 2-(difluoromethyl)-4-(2-methylpropyl)-6-(trifluoromethyl)-3,5-pyridinedicarbothioate
CAS No.
97886-45-8
Molecular Formula
C15H16F5NO2S2
Molecular Structure
Physical Properties
Molecular weight:401.4. Physical form:Colourless crystals,faint sulfur-like odor. . Density:1.41 (25 °C); Melting point:65 °C; Vapour pressure:0.53 mPa (25 °C); Henry constant:0.153 Pa m3 mol-1; Partition coefficient(n-octanol and water):logP = 4.75; Solubility:In water 1.4 mg/l (20 °C).; Stability:Stable to hydrolysis. Aqueous photolysis DT50 17.6-20.6 d.
Toxicology
Oral:Acute oral LD50 for rats and mice >5000 mg/kg. Percutaneous:Acute percutaneous LD50 for rabbits and rats >5000 mg/kg. Non-irritating to skin; slightly irritating to eyes (rabbits). Non-sensitising to skin (guinea pigs). Inhalation: LC50 (4 h) for rats >5.98 mg/l. ADI:( JMPR) 0.01 mg/kg b.w. [1992].
Environmental Profile
Ecotoxicology: 
Bees: LD50 (topical) 81 μg/bee (honeybee).Birds:Acute oral LD50 for bobwhite quail >2250 mg/kg. Dietary LC50 (5 d) for bobwhite quail and mallard ducks >5620 mg/kg.Daphnia: LC50 (48 h) >1.1 mg/l.Fish: LC50 (96 h) for rainbow trout 0.5, bluegill sunfish and common carp 0.7 mg/l. In a trout early life-stage study, the maximum acceptable toxicant concentration was determined to be 0.082 mg/l.Worms: LC50 (14 d) >1000 mg/kg. 
Environmental fate: 
Animals:In rats, rapidly absorbed, extensively metabolised and rapidly excreted.Soil:50 in soil 17-61 d, depending on the formulation type. The major soil metabolites are the di-acid, the normal mono-acid and the reverse mono-acid; these metabolites, themselves, dissipate almost completely within 1 year. 
WATER SOLUBILITY: Tech: 1.38 ppm at 20° C.
Transport Information
Signal Word:WARNING; Hazard Class:II (Moderately hazardous)

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