ENRICHMENT OF TRACE AMOUNTS OF PESTICIDES IN POLLUTED WATER BY A NOVEL TYPE OF SOLID PHASE EXTRACTION ELEMENT FOR THEIR THERMAL DESORPTION GC/MS ANALYSIS

A novel type of solid phase extraction element named“Magic Chemisorber” is developed for sorptive enrichment of dilute analytes from aqueous samples with high extraction efficiencies due to its capacious layer of sorbent polydimethylsiloxane.This extraction element combined with thermal desorption gas chromatography/mass spectrometry using a pyrolysis GC/MS system was applied to extract the pesticides from water samples over a concentration range of 10 -3 to 10 3 μg·l -1 .The method showed good li nearity for the tested concentration range with regression coefficients of 0 995 for over 5 decades.Limits of detection at a sub ng·l -1 (ppt)level were achieved and the reproducibility of the measurements was found to be fairly good,with relative standard deviation below 8%.