Determination of Organochlorine Pesticides and Polychlorinated Biphenyls in Soils by Gas Chromatography with Accelerated Solvent Extraction

The optimum extraction condition was studied for organochlorine pesticides and polychlorinated biphenyls in soils using accelerated solvent extraction (ASE). The sample was extracted with hexane/acetone (1∶ 1, V/V) with extraction temperature of 100℃ and pressure of 10.3 MPa and cleaned up by solid phase extraction with Florisil column, followed by separation on a capillary column. The target organic pollutants were then quantitatively determined by gas chromatography using electron capture detection. The detection limits of the method was 0.69~1.85 ng/g and average recovery was 83.6%~109.0% with precision of 1.11%~5.88% RSD (n=11). The method is simple, efficient, economical and suitable for the analysis of organochlorine pesticides and polychlorinated biphenyls in soil samples.