A multi-residue method for the determination of pesticides in tea using multi-walled carbon nanotubes as a dispersive solid phase extraction absorbent
文献类型： 外文期刊
作者： Hou, Xue 2 ; Lei, ShaoRong 1 ; Qiu, ShiTing 1 ; Guo, LingAn 1 ; Yi, ShengGuo 1 ; Liu, Wei 1 ;
作者机构： 1.Sichuan Acad Agr Sci, Ctr Anal & Testing, Chengdu 610066, Peoples R China
2.Chinese Acad Sci, Chengdu Inst Organ Chem, Chengdu 610041, Peoples R China
3.Univ Chinese Acad Sci, Beijing 100039, Peoples R China
关键词： Tea;QuEChERS;MWCNTs;Pesticide residues;PTV;GC-MS/MS
期刊名称：FOOD CHEMISTRY （ 影响因子：7.514； 五年影响因子：7.516 ）
ISSN：
年卷期：
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收录情况： SCI
摘要： A modified QuEChERS (quick, easy, cheap, effective, rugged and safe) method using multi-walled carbon nanotubes (MWCNTs) as a dispersive solid phase extraction (d-SPE) absorbent was established for analysis of 78 pesticide residues in tea. A 6 mg MWCNT sample was selected as the optimised amount based on the distribution of pesticide recoveries and clean-up efficiency from 6 mL acetonitrile extracts. The matrix effects of the method were evaluated and matrix-matched calibration was recommended. The method was validated employing gas chromatography coupled to tandem mass spectrometry (GC-MS/ MS) at the spiked concentration levels of 0.05,0.1 and 0.15 mg kg~(-1). For most of the targeted pesticides, the percent recoveries range from 70% to 120%, with relative standard deviations (RSDs) ＜20%. The linear correlation coefficients (r~2) were higher than 0.99 at concentration levels of 0.025-0.500 mg kg~(-1). In this study, MWCNTs were proved to be a promising d-SPE absorbent with excellent cleanup efficiency, which could be widely applied for the analysis of pesticide residues.
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