文献类型：期刊文献

英文题名：Solid-phase extraction based on magnetic core-shell silica nanoparticles coupled with gas chromatography-mass spectrometry for the determination of low concentration pesticides in aqueous samples

作者：Xiong, Zhichao;Zhang, Lingyi;Zhang, Runsheng[2];Zhang, Yurong[2];Chen, Jianhu;Zhang, Weibing[1]

机构：[1]E China Univ Sci & Technol, Shanghai Key Lab Funct Mat Chem, Dept Chem & Mol Engn, Shanghai 200237, Peoples R China;[2]Shanghai Inst Forens Sci, Shanghai Key Lab Crime Scene Evidence, State Key Lab Breeding Base Crime Scene Evidence, Shanghai, Peoples R China

年份：2012

卷号：35

期号：18

起止页码：2430

外文期刊名：JOURNAL OF SEPARATION SCIENCE

收录：;EI(收录号：20123915469808);WOS:【SCI-EXPANDED(收录号:WOS:000309059700010)】；

基金：Authors are thankful for the support of "the National Natural Science Foundation for young scientists of China (No.21105027)" and "Science and Technology Commission of Xinjiang Production and Construction corps (No. 2100BA031)."

语种：英文

外文关键词：Aqueous sample; GC-MS; Magnetic solid-phase extraction; Nanoparticles; Pesticides

摘要：A simple and effective preconcentration method based on magnetic coreshell silica nanoparticles with C18-modified surface was developed for the analysis of pesticide residues in environmental water samples by gas chromatography-mass spectrometry. Several kinds of organophosphorous and pyrethroid pesticides including methamidophos, dichlorvos, orthene, phorate, dimethoate, carbofuran, bifenthrin, fenpropathrin, cypermethrin, fenvalerate, and deltamethrin were used as model compounds to systematically evaluate the method. Various parameters, including the amounts of magnetic nanoparticles absorbents, extraction time, eluting solvent, eluting volume, and sample pH values were optimized. The optimized method affords low detection limits (signal-to-noise ratio = 3) from 0.001 to 0.008 mu g/L, and shows good linearity with correlation coefficients over 0.9990 in the concentration range of 0.0250.5 mu g/L. Average recoveries at three spiked levels were in the range of 70.2110.2% with relative standard deviations below 9.6%. A maximum enrichment factor of 1015 times was achieved. Analysis results of poisoned pond water indicate that this method is fast, convenient, and efficient for the detections of low-concentration pesticides in aqueous samples.