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Common NameTribufos
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中文通用名脱叶磷
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IUPACS,S,S-tributyl phosphorotrithioate
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CASS,S,S-tributyl phosphorotrithioate
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CAS No.78-48-8
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Molecular FormulaC12H27OPS3
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Molecular Structure
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Category
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ActivityPlant growth regulator
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Physical PropertiesMolecular weight:314.5; Physical form:Colourless to pale yellow liquid, with a mercaptan-like odour. Density:1.057 (20 °C); Melting point:<-25 °C; Vapour pressure:0.35 mPa (20 °C); 0.71 mPa (25 °C); Partition coefficient(n-octanol and water):logP = 3.23; Solubility:Practically insoluble in water (2.3 mg/l, 20 °C). Soluble in aliphatic, aromatic, and chlorinated hydrocarbons, and alcohols.; Stability:Relatively stable to acids and heat. Hydrolysed slowly under alkaline conditions; DT50 (35 °C) 14 d ( pH 4.7 to 9). Photolysed slowly.;
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ToxicologyOral:Acute oral LD50 for male rats 435, female rats 234 mg/kg. Percutaneous:Acute percutaneous LD50 for rats 850, rabbits c. 1000 mg/kg. Moderate primary dermal irritant; minimal eye irritant (rabbits). Not a skin sensitiser. Inhalation: LC50 (4 h) for male rats 4.65, female rats 2.46 mg/l (aerosol). Phytotoxicity:Very phytotoxic.
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Environmental ProfileEcotoxicology:
Bees:Relatively non-toxic to honeybees.Birds:Acute oral LD50 for bobwhite quail 142-163, mallard ducks 500-707 mg/kg. LC50 (5 d) for bobwhite quail 1643, mallard ducks >5000 mg/kg diet.Daphnia: LC50 (48 h) 0.12 mg/l.Fish: LC50 (96 h) for bluegill sunfish 0.72-0.84, rainbow trout 1.07-1.52 mg/l.
Environmental fate:
Animals:Tribufos is rapidly absorbed and metabolised; 96% of the administered radioactivity was excreted within 72 hours. Metabolism proceeds by hydrolysis followed by methylation and successive oxidation of butylmercaptan, yielding the main metabolite (3-hydroxySoil:In soil, tribufos is very strongly adsorbed, leaching is extremely unlikely. The half-life under field conditions is 2-7 weeks. The main metabolite is 1-butane sulfonic acid.Plant:Unmetabolised tribufos is the primary residue in treated cotton. -
Transport InformationSignal Word:DANGER; Hazard Class:Ib(Highly hazardous)
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