Determination of Organophosphorus Pestisides in Water, Soil and Biological Samples by Solid-Phase Microextraction and Gas Chromatography

Abstract

This paper describes a capillary gas chromatography method for the determination of organophosphorus pesticides in water, soil and biological samples with nitrogen phosphorus detector. The determination of the pesticides (co-ral, DDVP, disyston, ethion, phosdrin, malathion) in samples of tobacco, tea and water with a manual SPME-CG holder using a 100 μm PDMS microfiber, is simple, easy to handle and solventfree. The optimised conditions for pesticides extraction by SPME-CG method were optimized. Under choise conditions, the analytical curves were linear in different ranges (depend of each pesticide) with correlation coefficients from 0.9987 to 0.9992 and the precision was good (RSD from 3.2 to 7.6 %). The detection limit was 0.004 to 1.800 μg L^-1 and the quantification limit was 0.009 to 2.500 μg L^-1. This method was employed to detect and quantify pesticides with good results.