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Citation: LIU Li, ZHANG Qi, WANG Haiyan, FENG Feng, CAO Hairong, YANG Zhen, KE Zhijun, CHEN Xiyao. Determination of pyrethroid pesticides in tea by series two-solid phase extraction-columns cleanup and gas chromatography-tandem mass spectrometry[J]. Chinese Journal of Chromatography, ;2017, 35(8): 860-866. doi: 10.3724/SP.J.1123.2017.03033 shu

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

LIU Li ^1, ,
ZHANG Qi ^1,2 ,
WANG Haiyan ² ,
FENG Feng ² ,
CAO Hairong ² ,
YANG Zhen ² ,
KE Zhijun ² ,
CHEN Xiyao ³

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 Date: 27 March 2017

Fund Project: National Natural Science Foundation of China (No. 21375083)

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.
- gas chromatography-tandem mass spectrometry (GC-MS/MS),
- pyrethroid pesticides,
- tea
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