Citation: HUANG Yunxia, MENG Zhijuan, ZHAO Limin, SUN Wenyi, WANG Dong, FAN Sufang, LI Qiang, ZHANG Yan. Determination of 10 pyrethroid pesticide residues in tea by gas chromatography-tandem mass spectrometry coupled with multi-plug filtration cleanup[J]. Chinese Journal of Chromatography, ;2020, 38(7): 798-804. doi: 10.3724/SP.J.1123.2019.12010 shu

Determination of 10 pyrethroid pesticide residues in tea by gas chromatography-tandem mass spectrometry coupled with multi-plug filtration cleanup

Hebei Food Inspection and Research Institute, Key Laboratory of Food Safety of Heibei Province, Shijiazhuang 050000, China

Corresponding author: FAN Sufang, LI Qiang,
Received Date: 4 December 2019

Fund Project: National Key Research and Development Program of China (No. 2018YFC1603400)

A method for the determination of 10 pyrethroid pesticide residues in tea was established by multi-plug filtration cleanup (m-PFC) method combined with gas chromatography-tandem mass spectrometry (GC-MS/MS). Different extraction solvents (acetonitrile, acetone and ethyl acetate) and extraction methods (immersion without water and immersion with water) were compared. The effect of two kinds of QuEChERS pipes and m-PFC column on the purification of tea extracts and the pesticide recoveries were compared. The results showed that the tea samples could be extracted most efficiently when using acetonitrile without immersion in water. The m-PFC column had a good purification effect on the tea extract and could guarantee a high recovery rate. Good linear relationships were observed for the 10 pyrethroid pesticides, and the correlation coefficients (R²) were greater than0.9980. The average recoveries for the 10 pyrethroid pesticides were in the range of 87.5%-111.3% at four spiked levels, and the RSDs were in the range of 2.1%-8.9%. The LODs and LOQs were 0.001-0.015 mg/kg and 0.003-0.05 mg/kg, respectively. The method was applied to the determination of the 10 pyrethroid pesticides in 50 tea samples. The detection rate of the pyrethroid pesticides was 48%, but all the pesticide residues were below the national standard limits. Compared with the traditional QuEChERS and solid phase extraction methods, this method has the advantages of operational simplicity as well as high accuracy and good precision. The establishment of this method provides a new strategy for the rapid detection of pyrethroid pesticide residues in tea.
- gas chromatography-tandem mass spectrometry (GC-MS/MS),
- multi-plug filtration cleanup (m-PFC),
- pyrethroid pesticides,
- tea
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