Solid-phase Microextraction Coupled To Gas Chromatography For Determining Organic Chlorinated Pesticides And Its Micelle/water Partition Coefficients

A method for the determination of Organic Chlorinated Pesticides (OCPs) residues in environmental sample by Solid-phase Microextraction and Gas Chromatography (SPME-GC) was presented in this paper. Solid-Phase microextraction (SPME)is a novel solvent-free analytical technique,able to integrate extraction, concentration and sample introduction in a single step. Thus, it has been proved to be significantly more rapid, simple and easier. Especially PDMS (100μm) is more suitable for adsorbing and enriching the OCPs after its comparison with the other two fibers, PDMS-DVB(65μm) and PA(85μm). In this paper, experimental condition of SPME were also thoroughly optimized,including extraction fibers, extraction time, extraction temperature and salt concentrations, etc. This paper studies the similarities and differences of the extraction efficiency of 14 OCPs by HS-SPME and DI-SPME. It implies that there is distinctness difference on the extraction efficiency of different OCPs by two extraction modes. Through studies the 14 OCPs can discover the linearity in the detecting range is good(0.98-0.99)with the detection limits of 0.2-40 ng/L, and the quantification limits of 0.1-10 ng/L.The RSDs were lower than 8%.The optimized method has been employed to detect the organic chlorine pesticides in the practical water sample, it has been proved to be simple,fast and accurate.This research builds the method that SPME/GC determining OCPs, use this method to preliminary study micelle/water partition coefficient of OCPs in difference surfactants and do simple comparison to different extractions methods(DI-SPME and HS-SPME) and different surfactants(anionic surfactants SDS,cationic surfactants CTMAB,nonionic surfactants Triton X-100).