Chinese Journal of Chromatography ›› 2014, Vol. 32 ›› Issue (7): 784-788.DOI: 10.3724/SP.J.1123.2014.03034

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Simultaneous determination of 16 organophosphorous pesticides in vegetables, fruits and tea by gas chromatography coupled with clean-up by mesoporous alumina as solid-phase extraction adsorbent

HU Yeqin1, XI Cunxian2,3, CAO Shurui2,3, WANG Guomin2,3, LI Xianliang2,3, ZHANG Lei2,3, ZHANG Yunhuai1   

  1. 1. College of Chemistry and Chemical Engineering, Chongqing University, Chongqing 400030, China;
    2. Chongqing Entry-Exit Inspection and Quarantine Bureau, Chongqing 400020, China;
    3. Chongqing Engineering Technology Research Center of Import and Export Food Safety, Chongqing 400020, China
  • Received:2014-03-24 Revised:2014-05-06 Online:2014-07-08 Published:2014-06-25

Abstract:

A gas chromatographic method based on solid-phase extraction was developed for the simultaneous determination of 16 organophosphorous pesticides in vegetables, fruits and tea, including cabbage, lettuce, pumpkin, onion, tomato, turnip, apple, pear and tea. The samples were extracted with ethyl acetate, and clean-up with mesoporous alumina as solid-phase extraction adsorbent. The separation of target compounds was performed on a DB-1701 capillary column, and the quantitative analysis of the organophosphorous pesticides was carried out by gas chromatography with flame photometric detection. The results showed that the calibration curves of the 16 organophosphorous pesticides were linear in the range of 10-2000 μg/L with good correlation coefficients (R2>0.997). The recoveries of the pesticides in different samples at three spiked levels ranged from 83.2% to 103.8% with the relative standard deviations of 2.0%-9.9%. This method has high sensitivity, high accuracy and good repeatability, and can be applied to the determination of the organophosphorus pesticide residues in vegetables, fruits and tea.

Key words: fruits, gas chromatography (GC), mesoporous alumina, organophosphorous pesticides, solid-phase extraction (SPE), tea, vegetables

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