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Chemical Identification
Common Name
O-ethyl S,S-dipropyl phosphorodithioate
O-ethyl S,S-dipropyl phosphorodithioate
Molecular Formula
Molecular Structure
Physical Properties
Molecular weight:242.3. Physical form:Pale yellow liquid. Density:1.094 (20 °C); Flash point:140 °C (closed cup); Vapour pressure:46.5 mPa (26 °C); Partition coefficient(n-octanol and water):logP = 3.59 (21 °C); Solubility:In water 700 mg/l (20 °C). In acetone, ethanol, xylene, 1,2-dichloroethane, diethyl ether, ethyl acetate, petroleum spirit, cyclohexane >300 g/ kg (20 °C).; Stability:Very stable in neutral and weakly acidic media. Rapidly hydrolysed in alkaline media. Stable in water up to 100 °C at pH 7.
Oral:Acute oral LD50 for rats 62, rabbits 55 mg/kg. Percutaneous:Acute percutaneous LD50 for rabbits 26 mg/kg. May cause skin and eye irritation. Inhalation: LC50 for rats 123 mg/m3. ADI:0.4 mg/kg.
Environmental Profile
Bees:Not hazardous to bees when used as directed.Birds:Acute oral LD50 for mallard ducks 61, hens 5.6 mg/kg. Fish: LC50 (96 h) for rainbow trout 13.8, bluegill sunfish 2.1, goldfish 13.6 mg/l. 
Environmental fate: 
Animals:In rats, the principal metabolite is O-ethyl-S-propylphosphothioic acid, which is no more toxic than ethoprophos itself.Soil: DT50 in humus-containing soil ( pH 4.5) c. 87 d; in sandy loam ( pH 7.2-7.3) c. 14-28 d (J. H. Smelt et al., Pestic. Sci., 1977, 8, 147Plant:In plants such as haricot beans and maize, ethoprophos is rapidly broken down into non-toxic metabolites such as methyl propyl sulfide, methyl propyl sulfoxide and methyl propyl sulfone.
Transport Information
Hazard Class:Ia (Extremely hazardous)

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