Piperophos

Piperophos

哌草磷

S-2-methylpiperidinocarbonylmethyl O,O-dipropyl phosphorodithioate

S-[2-(2-methyl-1-piperidinyl)-2-oxoethyl] O,O-dipropyl phosphorodithioate

24151-93-7

C₁₄H₂₈NO₃PS₂

Herbicides > Organophosphorus herbicides

Herbicide

Dimethametryn+piperophos
Emulsifiable concentrate. 
Premix Parters: pyrethrins;

Molecular weight:353.5; Physical form:Pale yellow, slightly viscous clear liquid, with a somewhat sweet odour. Density:1.13 (20 °C); Vapour pressure:0.032 mPa (20 °C); Henry constant:4.5 × 10-4 Pa m3 mol-1 ( calc.); Partition coefficient(n-octanol and water):logP = 4.3; Solubility:In water 25 mg/l (20 °C). Miscible with benzene, hexane, acetone, dichloromethane and octanol.; Stability:Stable under normal storage conditions. Slowly hydrolysed at pH 9; DT50 (20 °C) ( calc.) >200 d (pH 7), 178 d (pH 9).

Oral:Acute oral LD₅₀ for rats 324 mg/ kg. Percutaneous:Acute percutaneous LD₅₀ for rats >2150 mg/kg. Non-irritant to skin; slight irritant to eyes (rabbits). Inhalation: LC₅₀ (1 h) for rats >1.96 mg/l air. ADI:( JMPR) 0.2 mg/ kg b.w. [1995].

Ecotoxicology: 
Algae: EC₅₀ (5 d) for Scenedesmus subspicatus 0.059 mg/l.Bees: LD₅₀ (oral) >22µg/bee; (contact) 30µg/bee.Birds:Dietary LC₅₀ (8 d) for Japanese quail 11 629 ppm.Daphnia: LC₅₀ (48 h) 0.0033 mg/l.Fish: LC₅₀ (96 h) for rainbow trout 6, crucian carp 5 mg/l.Worms: LC₅₀ (14 d) for earthworms 180 mg/ kg soil. 

Environmental fate: 
Animals:In urine, no unchanged piperophos was present, indicating extensive degradation of the compound. Degradation proceeds via hydrolysis of the thiolo phosphate followed by methylation of the sulfur or hydroxylation of the piperidine moiety. Hydroxylation at Soil: DT₅₀ (field) <30 d; rapid dissipation by biodegradation from soil and paddy systems. Relatively stable to hydrolysis and photolysis.Plant:Degradation of piperophos takes place rapidly in the plant, forming 2-(2'-methyl-1'-piperidinyl)-2-oxoethane sulfonic acid, 2-(2'-methyl-1'-piperidinyl)-2-oxoethanoic acid and a fraction of unknown polar substances. WATER SOLUBILITY: 25 mg/l at 20°C

Signal Word:DANGER; Hazard Class:Ib(Highly hazardous)