Simultaneous Determination of 15 Organochlorine Pesticide Residues in Soil by GC/MS/MS

In this work, a reliable method for simultaneous determination 15 organochlorinepesticide (OCP) residues (alpha-HCH, beta-HCH, gamma-HCH, delta-HCH, hexachlorobenzene, heptachlor, aldrin, alpha-chlordane, gamma-chlordane, dieldrin, endrin , O,P´-DDE, O,P´-DDT ,P,P´-DDT and P,P´-DDD) in soil was reported. The method was based on sonicated extraction with a mixture of acetone and petroleum ether (50:50,v/v) and a cleanup with liquid-liquid-extraction (LLE), followed by gas chromatographic separation and a GC-ion trap-MS-MS detection.The determination of 15 compounds was achieved in about 20 min. Pesticide residues could be determined in low level range.Limits of detection (LOD) were from 1 mug/kg for alpha-chlordane to 0.025 mug/kg for O,P´-DDE(S/Nges3). Limits of quatification (LOQ) were all lower than 1 mug/kg (S/Nges10),which indicated the method established was more sensitive than the traditional ways (GC-ECD, GC/MS/SIM).Average recoveries ranged from 75 to 106% and relative standard deviations (RSDs) were in the range 2.4-12.7% for all analytes across three spiked soil levels.The results demonstrated the suitability of the GC/MS/MS approach for the analysis of multi-residue OCPs in soil.