Simultaneous Determination of Pesticides Residues in Greasy Wool using Gas Chromatography/Mass Spectrometry System with a Three-way Splitter and Backflush

摘要

GC/MS system using a three-way splitter and backflush was applied to the determination of 20 organophosphorus and organochlorine pesticides in greasy wool. The sample was extracted by carbon dioxide-supercritical fluid extraction, the extract obtained was cleaned up by N-Aluminum solid phase extraction column. The detection procedure was carried out by GC/MS system combined with uECD and NPD. With this method, the accurate qualitative and quantitative results could be obtained simultaneously, and at the end of run, the heavy compounds in sample matrix were backflushed from the column instead of bake-out in high temperature, which avoided system contamination, extended the column lifetime and provided more productivity.