title: Determination of organophosphorus pesticides in cucumber and potato by stir bar sorptive extraction.
abstract: Organophosphorus pesticides (OPPs) in vegetables were determined by stir bar sorptive extraction (SBSE) and capillary gas chromatography with thermionic specific detection (TSD). Hydroxy-terminated polydimethylsioxane (PDMS) prepared by sol-gel method was used as extraction phase. The effects of extraction temperature, salting out, extraction time on extraction efficiency were studied. The detection limits of OPPs in water were < or = 1.2 ng/l. This method was also applied to the analysis of OPPs in vegetable samples and matrix effect was studied. Linear ranges of OPPs in vegetable samples were 0.05-50 ng/g with detection limits < or =0.15 ng/g and the repeatability of the method was less than 20% relative standard deviation.
authors.affiliation: Department of Analytical Chemistry and Micro-Instrumentation, Dalian Institute of Chemical Physics, Chinese Academy of Sciences.
authors.forename: Wenmin
authors.initials: W
authors.lastname: Liu
authors.forename: Yuan
authors.initials: Y
authors.lastname: Hu
authors.forename: Jinghong
authors.initials: J
authors.lastname: Zhao
authors.forename: Yuan
authors.initials: Y
authors.lastname: Xu
authors.forename: Yafeng
authors.initials: Y
authors.lastname: Guan
mesh_terms: D005591:Chemical Fractionation / Q000379:methods; D002849:Chromatography, Gas; D018553:Cucumis sativus / Q000737:chemistry*; D006358:Hot Temperature; D009943:Organophosphorus Compounds / Q000032:analysis*; D010575:Pesticides / Q000032:analysis*; D011198:Solanum tuberosum / Q000737:chemistry*
chemical_list: D009943:Organophosphorus Compounds; D010575:Pesticides