Citation: RONG Jiefeng, WEI Hang, LI Yijun, HUANG Huoshui, XU Meizhu. Determination of 21 organophosphorus pesticides in tea by gas chromatography-mass spectrometry coupled with hydroxylated multi-walled carbon nanotubes based on dispersive solid-phase extraction[J]. Chinese Journal of Chromatography, ;2016, 34(2): 194-201. doi: 10.3724/SP.J.1123.2015.07021 shu

Determination of 21 organophosphorus pesticides in tea by gas chromatography-mass spectrometry coupled with hydroxylated multi-walled carbon nanotubes based on dispersive solid-phase extraction

1.
Quanzhou Entry-Exit Inspection & Quarantine Bureau, Quanzhou 362000, China

Corresponding author: RONG Jiefeng,
Received Date: 21 July 2015

Fund Project: 福建检验检疫局科技计划项目(FK2013-26) (FK2013-26)国家质检总局项目(2015IK035) (2015IK035)安溪县科技计划项目(N[2015]0065). (N[2015]0065)

A rapid determination method of 21 organophosphorus pesticides in tea was developed by QuEChERS method using modified multi-walled carbon nanotubes (MWCNTs-OH), primary-secondary amine (PSA) and MgSO₄ coupled with gas chromatography-mass spectrometry. The pesticide residues in tea were extracted with a hexane-acetone (2 : 1, v/v) mixture, and cleaned up by dispersive solid-phase extraction using MWCNTs-OH and primary-secondary amine (PSA) as the sorbents. After centrifugation and filtration, the target compounds were analyzed by gas chromatography-mass spectrometry and quantified by the external standard method. Under the optimized conditions, good linearities were obtained in the range of 0.01-0.50 mg/kg. The average recoveries were in the range of 81.5%-109.4% at three spiked levels, with relative standard deviations (RSDs, n=5) of 2.3%-10.6%. The limits of quantification were 0.001-0.040 mg/kg. This method is simple, fast, sensitive, cheap, and can meet the requirements of the rapid detection of organophosphorus pesticides in tea.
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沈阳化工大学材料科学与工程学院沈阳 110142