Edifenphos

Edifenphos

敌瘟磷

O-ethyl S,S-diphenyl phosphorodithioate

O-ethyl S,S-diphenyl phosphorodithioate

17109-49-8

C₁₄H₁₅O₂PS₂

Fungicides > Organophosphorus fungicides

Fungicide

Molecular weight:310.4; Physical form:Yellow to light brown liquid, with a characteristic odour. Density:1.251 g/cm3 (20 °C); Melting point:-25 °C; Flash point:115 °C (tech., DIN 51755); Vapour pressure:3.2×10-2 mPa (20 °C); Henry constant:2 × 10-4 Pa m3 mol-1 (20 °C); Partition coefficient(n-octanol and water):logP = 3.83 (20 °C); Solubility:In water 56 mg/l (20 °C). In n-hexane 20-50, dichloromethane, isopropanol, toluene 200 (all in g/l, 20 °C). Readily soluble in methanol, acetone, benzene, xylene, carbon tetrachloride and dioxane. Sparingly soluble in heptane.; Stability:Stable in neutral media. Hydrolysed by strong acids and alkalis; at 25 °C, DT50 19 d ( pH 7), 2 d (pH 9). Degradable in the presence of light.;

Oral:Acute oral LD₅₀ for rats 100-260, mice 220-670, guinea pigs and rabbits 350-400 mg/ kg. Percutaneous:Acute percutaneous LD₅₀ for rats 700-800 mg/kg. Slightly irritating to skin; not irritating to eyes (rabbits). Inhalation:LC₅₀ (4 h) for rats 0.32-0.36 mg/l air (aerosol).

Ecotoxicology:
Bees:Not hazardous to bees when used as directed.Birds:Acute oral LD₅₀ for bobwhite quail 290, mallard ducks 2700 mg/kg.Daphnia LC₅₀ (48 h) 0.032 mg/l.Fish:LC₅₀ (96 h) for rainbow trout 0.43, bluegill sunfish 0.49, carp 2.5 mg a.i./l (using WP15). 

Environmental fate: 
Animals:Rapidly and almost completely absorbed, metabolised and eliminated by rats and mice within 72 hours of oral administration, after which time only a small amount was recovered from the tissues. Edifenphos was degraded primarily by loss of the phenyl, thiopSoil:Leaching was very slight in soil columns, and inversely correlated with soil adsorption and soil o.m.content, indicating that edifenphos will be nearly immobile following application to soil. DT₅₀ in soil was iPlant:¹⁴C-Edifenphos was degraded in rice primarily by loss of phenyl, thiophenyl and/or ethyl groups to give organophosphorus acids, the ultimate products being benzenesulfonic acid and presumably phosphoric acid.

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