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Residue pattern of chlorpyrifos and its metabolite in tea from cultivation to consumption

文献类型： 外文期刊

作者： Yin, Peng 1 ; Dai, Jinxia 3 ; Guo, Guiyi 1 ; Wang, Zihao 1 ; Liu, Wei 1 ; Liu, Xin 2 ; Chen, Hongping 2 ;

作者机构： 1.Xinyang Agr & Forestry Univ, Coll Tea Sci, Henan Key Lab Tea Plant Comprehens Utilizat South, Xinyang, Peoples R China

2.Minist Agr & Rural Affairs, Key Lab Tea Qual & Safety Control, Hangzhou, Peoples R China

3.Chinese Acad Agr Sci, Tea Res Inst, Hangzhou 310008, Peoples R China

关键词： tea; chlorpyrifos; 3,5,6-trichloro-2-pyridinol; dissipation; risk assessment

期刊名称：JOURNAL OF THE SCIENCE OF FOOD AND AGRICULTURE （ 影响因子：3.638； 五年影响因子：3.802 ）

ISSN： 0022-5142

年卷期：

页码：

收录情况： SCI

摘要： BACKGROUND Chlorpyrifos (CPF) is a broad-spectrum organophosphorus pesticide widely used to control tea geometrid (Ectropis oblique) and tea green leafhoppers (Empoasca pirisuga Matsumura) in tea trees. The major metabolite of CPF in water, plants, and animals is 3,5,6-trichloro-2-pyridinol, which is more toxic than CPF. However, the dissipation pattern of CPF in tea is unknown. RESULTS An optimized QuEChERS sample preparation method combined with ultra-performance liquid chromatography-tandem mass spectrometry was applied to determine the residues of chlorpyrifos and its metabolite in tea during tea planting and green tea processing. During tea planting, the sum of chlorpyrifos and its metabolite dissipated rapidly with a half-life of 1.93 days for tea shoots. The residues of chlorpyrifos and its metabolite in made green tea were 96.89 and 35.88 mu g kg(-1) on the seventh day. The values for processing factors of chlorpyrifos and its metabolite were all less than 1, showing that each green tea manufacturing step was responsible for the reduction. The transfer rates of chlorpyrifos and its metabolite from made green tea to its infusion were 0.68-4.62% and 62.93-71.79%, respectively. CONCLUSION The risk of chlorpyrifos was negligible to human health based on the hazard quotient, which was 7.4%. This study provides information relevant to the reasonable application of chlorpyrifos in tea planting and is potentially helpful for tea exporting and importing countries to establish harmonized maximum residue limits. (c) 2020 Society of Chemical Industry

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