Rapid titrimetric method for the determination of captan and folpet in fungicide formulations

Abstract

A simple, rapid titrimetric method for the determination of captan and folpet based on their reduction with potassium trithiocarbonate is described. The compounds in dimethylformamide-water are titrated with the reagent and the end-point determined by the appearance of a yellow colour (the reagent acting as a self indicator) or potentiometrically. The method has been successfully applied to the determination of captan and folpet in commercial formulations.