Pre-treatment Methods for Analysis of Persistent Organic Pollutants in Soil Samples

In this paper, the study on pre-treatment technology for analysis of persistent organic pollutants in soil samples was reported. Accelerated solvent extraction(ASE) method was used to extract organochlorine pesticides and polychlorinated biphenyls in soil samples and the results were compared with those from Soxhlet extraction（SE） method. It indicates that ASE can substitute for traditional SE method in extraction of persistent organic pollutants in soil samples. Different sorbents for cleanup column used in solid phase extraction(SPE) were selected by the experiments and the cleanup effect for organochlorine pesticides and polychlorinated biphenyls in soil samples by SPE and sulphonation method were compared. The clean-up condition for gel permeation chromatography(GPC) was also optimized. The results of the study show that the method of GPC combined with SPE is suitable for the pretreatment of soil samples with complicated matrix. And the average recoveries for the method of ASE combined with SPE is 68%~106% with the precision of less than 7.7%RSD.