Gas Chromatographic Analysis of Pesticides Part II

Gas Chromatographic Determination of Organophosphorus Pesticides

Abstract

Suitable conditions on the gas chromatographic determination of 12 organophosphorus pesticides were studied. Shimadzu Model GC-1B gas chromatograph with a hydrogen flame ionization detector was used. Columns used were packed with: 1) 1.5% high vacuum silicone grease (HVSG), 2) 1.5% SE-30, 3) 1.5% SE-52, 4) 1% QF-1, 5) 1.5% neopentylglycol succinate (NGS), 6) 1.5% diethyleneglycol succinate (DEGS). DEGS was the most suitable for separation of the candidate pesticides. Dicyclohexyl phthalate and diphenyl phthalate were used as the internal standard for the quantitative analysis of technical grade of dimethoate and EPN, respectively. The results of the gas chromatographic analyses of dimethoate and EPN were coincided with those of TLC and colorimetric methods. Gas chromatographic analyses are useful for the determination of dimethoate and EPN in the technical products, and desirable conditions are presented.