Research on Dehydration of Agricultural Soil Extract During BHCs and DDTs Deter-mination
After rapid solvent extraction of fresh agricultural soil,the extraction solution contains water.A rapid solvent extraction-gas chromatography method was established for the determination of BHCs and DDTs residues in agricultural soil.Pure water was added to the accelerated solvent extraction solution,acetone and n-hexane were removed by vacuum distillation,and the remaining solution was extracted by n-hexane using liquid-liquid extraction,after concentrated and purified,the extract was then detected by gas chromatography.The detection limits were 4.90×10-3～4.80×10-2 mg/kg,and the correlation coefficients were greater than 0.999.The recoveries were 76.2％～91.2％,and the relative standard deviations were 1.2％～6.1％.The method is accurate and reliable,and can be used for the determination of BHCs and DDTs in soil of actual agricultural land.
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