Terbufos

Terbufos

特丁硫磷

S-tert-butylthiomethyl O,O-diethyl phosphorodithioate

S-[[(1,1-dimethylethyl)thio]methyl] O,O-diethyl phosphorodithioate

13071-79-9

C₉H₂₁O₂PS₃

Insecticides > Organophosphorus insecticides

Insecticide, nematicide

Molecular weight:288.4; Physical form:Slightly yellow liquid, with a mercaptan-like odour. Density:1.105 (24 °C); Composition:Tech. grade is ×85% pure. Melting point:-29.2 °C; Flash point:88 °C (Tag open cup); Vapour pressure:34.6 mPa (25 °C); Partition coefficient(n-octanol and water):logP = 2.77; Solubility:In water 4.5 mg/l (27 °C). Readily soluble in most organic solvents, e.g. aromatic hydrocarbons, chlorinated hydrocarbons, alcohols, acetone c. 300 g/l.; Stability:Stable for more than 2 years at room temperature. Decomposes on prolonged heating above 120 °C. Hydrolysis DT50 for tech. 2-3 d (pH 4-9).;

Tech (Rat): 1.6 mg/kg (male); 1.3 mg/kg (female). (Mouse): 3.5 mg/kg (male); 9.2 mg/kg (female). (Rabbit): Dermal 0.81 mg/kg. Counter* (Rat): Dermal LD₅₀ 11.7 mg/kg. (Rabbit): Dermal LD₅₀ 10.2 mg/kg

Ecotoxicology: 
Bees:Not toxic to bees when used as directed. LD₅₀ for honeybees by topical application 4.1 µg/bee.Birds:Dietary LC₅₀ (8 d) for mallard ducks 185, ring-necked pheasants 145 mg/kg diet.Fish: LC₅₀ (96 h) for rainbow trout 0.01, bluegill sunfish 0.004 mg/l. 

Environmental fate:
 Animals:Degradation in animals is the same as in soil.Soil:Oxidative and hydrolytic degradation occurs in soil. No accumulation. Half-life in soil is 9-27 d.Plant:Degradation in plants is the same as in soil.

Signal Word:DANGER-POISON; Hazard Class:Ia(Extremely hazardous)