Journal
ANALYTICAL METHODS
Volume 6, Issue 1, Pages 253-260Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c3ay41454j
Keywords
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Funding
- National Natural Science Foundation of China [31171698]
- Scientific and Technological Research Foundation of Department of Education of Hebei Province [ZH2012012]
- Hebei Province Science and Technology Support Program [12396908D]
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A graphene-based magnetic nanocomposite (Fe3O4@SiO2-G) was synthesized and used as the adsorbent for the extraction of fourteen pesticides in tomato and rape samples prior to their gas chromatography-mass spectrometry (GC-MS) detection. Various experimental parameters affecting the extraction efficiencies, such as the amount of Fe3O4 @SiO2-G, extraction time, the pH and salt concentration of the sample solution and desorption conditions were investigated. Under optimized experimental conditions, good linearity existed in the range of 1.0-100.0 ng g(-1) for all the analytes with the correlation coefficients (r) ranging from 0.9972 to 0.9996. The limits of detection (S/N = 3) of the method for the compounds were between 0.005 and 0.030 ng g(-1) for the vegetable samples. Good reproducibilities were obtained with the relative standard deviations (RSDs) below 12.5% (n = 5). The recoveries of the method were in the range between 83.2% and 110.3%.
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