Chinese Journal of Chromatography

Chinese Journal of Chromatography ›› 2017, Vol. 35 ›› Issue (8): 860-866.DOI: 10.3724/SP.J.1123.2017.03033

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Determination of pyrethroid pesticides in tea by series two-solid phase extraction-columns cleanup and gas chromatography-tandem mass spectrometry

LIU Li1, ZHANG Qi1,2, WANG Haiyan2, FENG Feng2, CAO Hairong2, YANG Zhen2, KE Zhijun2, CHEN Xiyao3   

  1. 1. Physical and Chemical Inspection Institute, Datong Center for Disease Control and Prevention, Datong 037008, China;
    2. School of Chemistry and Environment Engineering, Shanxi Datong University, Datong 037009, China;
    3. Shanghai Institute of Technology and Strict Testing Measurement, Shanghai 200233, China
  • Received:2017-03-27 Online:2017-08-08 Published:2013-11-25
  • Supported by:

    National Natural Science Foundation of China (No. 21375083); Training Project of Shanxi Datong University Students' Innovation and Entrepreneurship (No. 2015348); Shanxi Datong University launched Doctoral Research Program (No. 2008K3); Fund Program for the Scientific Activities of Selected Returned Oversea Professionals in Shanxi Province (No. 14).

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Abstract:

A rapid determination method of three pyrethroid pesticides (cyfluthrin, cypermethrin and fenvalerate) in tea was developed by series two-solid phase extraction-column cleanup and external standard method coupled with gas chromatography-tandem mass spectrometry (GC-MS/MS) in 30 min. The pesticide residues in tea were extracted with acetonitrile, and cleaned up by Carb/NH2 and SLH solid-phase extraction columns. After filtration, the target compounds were analyzed by GC-MS and quantified by the external standard method. Under the optimized conditions, good linear ranges of 0.05-2.00 mg/kg were obtained. The limits of detection varied from 0.3 to 1.0 μ g/kg. The linear correlation coefficients were greater than 0.999. At three spiked levels (0.10, 0.50 and 2.00 mg/L), the average recoveries were determined between 80.6% and 116.3% in the four matrices. The inter-day relative standard deviations were between 1.3%-12.6%, and the intra-day relative standard deviations were between 2.7% and 12.1%. This method is simple, fast, and has a good reproducibility, which can meet the requirements of the rapid detection of pyrethroid pesticides in tea.

Key words: gas chromatography-tandem mass spectrometry (GC-MS/MS), pyrethroid pesticides, tea

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