DISULFOTON: ACUTE TOXICITY TO DAPHNIA MAGNA UNDER STATIC RENEWAL CONDITIONS

Abstract

The test substance, disulfoton, 0,0-diethyl S-[2-(ethylthio)ethyl]­ phosphorodithioate (C8H1902PS3) is a colorless oily liquid that is used commercially as an insecticide and acaricide. It is used for control of many species of insects and mites, and is particularly effective as a seed treatment against sucking insects. It is reported to be soluble in water at 25 mg/L (Farm Chemicals Handbook, 1987), and subject to hydrolysis under alkaline conditions. Commonly used trade names for the test substance are Disyston or Di-syston.

The objectives of this study were to determine the 48-hr LCSO, the 48-hr ECSO, and if possible, the 48-hr NOEC of disulfoton to the freshwater cladoceran, Daphnia magna, under static renewal test conditions.