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Chemical Identification
Common Name
O,O,O′,O′-tetraethyl dithiopyrophosphate
thiodiphosphoric acid ([(HO)2P(S)]2O) tetraethyl ester
Molecular Formula
Molecular Structure
Physical Properties
Molecular weight:322.3; Physical form:Pale yellow liquid. Density:1.196 (20 °C); Flash point:102 °C; Vapour pressure:14 mPa (20 °C); Henry constant:4.5 × 10-1 Pa m3 mol-1 (20 °C); Partition coefficient(n-octanol and water):logP = 3.99 (20 °C); Solubility:In water 10 mg/l (20 °C). Miscible with most organic solvents. Sparingly soluble in ligroin and petroleum ether.; Stability:Relatively slowly hydrolysed; DT50 (est.) 10.7 d ( pH 4), 8.2 d ( pH 7), 9.1 d ( pH 9) (22 °C).;
Oral:Acute oral LD50 for rats c. 10 mg/kg. Percutaneous:Acute percutaneous LD50 (7 d) for rats 65 mg/kg; (4 h) for rats 262 mg/kg. Not irritating to eyes and skin (rabbits). Inhalation: LC50 (4 h) for rats c. 0.05 mg/l air (aerosol). Phytotoxicity:Phytotoxic to some ornamentals, e.g. chrysanthemums, orchids, and some rose varieties. ADI:0.24 mg/kg.
Environmental Profile
Algae: ErC50 for Scenedesmus subspicatus 7.2 mg/l.Bees:No data; only used as a glasshouse fumigant.Birds:No data; only used as a glasshouse fumigant.Daphnia: LC50 (48 h) 0.002 mg/l.Fish: LC50 (96 h) for golden orfe 0.071, rainbow trout 0.00361 mg/l. 

Environmental fate: 
Animals:Orally administered sulfotep was absorbed relatively quickly by rats. Elimination took place quickly via the kidney. The main elimination product is the diethylthiophosphate.Soil:Koc value and leaching studies indicate that sulfotep can be classified as immobile. Degraded quickly in different soils. Monothiotep and tetraethylpyrophosphate were very short-lived intermediate products which were degraded tPlant:Major metabolites are monothiotep, tetraethylpyrophosphate, diethylthiophosphoric acid and diethylphosphoric acid.
Transport Information
Hazard Class:Ia(Extremely hazardous)

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