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Chemical Identification
Common Name
O-ethyl S,S-diphenyl phosphorodithioate
O-ethyl S,S-diphenyl phosphorodithioate
Molecular Formula
Molecular Structure
Physical Properties
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).
Environmental Profile
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.
Transport Information
Signal Word: WARNING; Hazard Class:Ib(Highly hazardous)

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