The examination of tetrachlorvinphos and its formulations for the presence of tetrachlorodibenzo-p-dioxins by a gas-liquid chromatographic method

Abstract

A gas-chromatographic method for the examination of the insecticide tetrachlorvinphos [Gardona, the Z- or trans-styrene isomer of 2-chloro-1-(2,4,5-trichlorophenyl)vinyldimethyl phosphate] for the presence of tetrachlorodibenzo-p-dioxins is described.

Procedures are described both for the extraction and clean-up of the sample and for the final analysis to determine tetrachlorodibenzo-p-dioxins down to 0·025 p.p.m. or less by gas-liquid chromatography with electron-capture detection.

Tetrachlorodibenzo-p-dioxins were not detected in various samples of tetrachlorvinphos and its formulations, either before or after accelerated storage for 2 weeks at 55 °C.