Determination of Chloropicrin in Soil by Headspace Gas Chromatography

An effective and rapid analytical method for determination of chioropicrin residues in soil was developed.Chloropicrin in soil was extracted with petroleum ether by shaking for 30 min.The supernatant was transferred into a clear headspace vial after centrifugation and determined by headspace gas chromatography with ECD.The correlation coefficient at the concentration range of 0.005- 4 mg/L was 0.999.The average recoveries were 82.7%-109.9% at fortified concentration range of 0.012 5-1.25 mg/kg,with relative standard deviations(RSD) of 8.4%-9.5%.The limit of detection(LOD) was 0.008 8 mg/kg,The limit of quantitation(LOQ) was 0.029 mg/kg.The results showed that this method can be applied to determine the residues of chloropicrin in soil.