期刊
JOURNAL OF SEPARATION SCIENCE
卷 35, 期 18, 页码 2430-2437出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/jssc.201200260
关键词
Aqueous sample; GC-MS; Magnetic solid-phase extraction; Nanoparticles; Pesticides
资金
- National Natural Science Foundation for young scientists of China [21105027]
- Science and Technology Commission of Xinjiang Production and Construction corps [2100BA031]
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.
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