Abstract
Studies were conducted to determine the gas effect of Disulfoton (0, 0-diethyl S-[2-(ethylthio) ethyl] phosphorodithioate) by using sealed containers. Disulfoton vaporizing into the air was collected by using sealed containers containing bean plants. Plants were extracted with acetone and determined by gas liquid chromatography with a flame photometric detector. When plants were exposed to Disulfoton vaporizing into the container for 24 hours, Disulfoton and its oxidative metabolites had been found in the bean plants in the rate of 10.0ppm. The results obtained were: Disulfoton 70%; Disulfoton sulfoxide 13%; Disulfoton sulfone 14%; and Disulfoton oxygen analogs 3%. Disulfoton applied to soils was found as being metabolized by plant and the soil to the corresponding sulfoxide, sulfone derivatives and oxygen analogs of Disulfoton. Only a very small amount of the total activity extracted from the plant could be found as Disulfoton. These facts were quite different from the rate of gas effect and systemic effect of Disulfoton and its metabolites on plants. These processes of gas effect are considered to be related to the physical and chemical properties of Disulfoton and its oxidative metabolites. Disulfoton which has gas effect had high vapor pressure and high volatalization.
