Residue behavior, transfer and risk assessment of tolfenpyrad, dinotefuran and its metabolites during tea growing and tea brewing
唑虫酰胺、呋虫胺及其代谢物在茶叶种植和泡茶过程中的残留行为、转移及风险评价
- 关键词：
- 来源：
- Journal of the Science of Food and Agriculture 期刊
- 类型：
- 学术文献
- 语种：
- 英语
- 原文发布日期：
- 2021-04-13
- 摘要：
- BACKGROUND：Tolfenpyradand dinotefuran are two representative pesticides used for pest control in teagardens. Their application may bring about a potential risk to the health ofconsumers. Therefore, it is essential to investigate the residue behavior,transfer and risk assessment of tolfenpyrad, dinotefuran and metabolites fromtea garden to teacup. RESULTS：An effectiveanalytical method was established and validated to simultaneously determinetolfenpyrad, dinotefuran and its metabolites (DN and UF) in tea. The averagerecoveries of tolfenpyrad, dinotefuran, DN and UF werein the range 72.1–106.3%,with relative standard deviations lower than 11.8%.On the basis of the proposedmethod, the dissipation of tolfenpyrad and dinotefuran in fresh tea leavesfollowed first-order kinetics models with half-lives of 4.30–7.33 days and 4.65–5.50 days,respectively. With application amounts of 112.5–168.75 g a.i. ha–1 once or twice, the terminal residues of tolfenpyrad and total dinotefuran ingreen tea were lower than 19.6 and 7.13 mg kg−1, respectively, andbelow their corresponding maximum residue limits . The leaching rates oftolfenpyrad and total dinotefuran during the tea brewing were in the ranges 1.4–2.3%and93.7–98.1%, respectively.CONCLUSION：Tolfenpyradand dinotefuran in tea were easily degraded. The RQc and RQa values for tolfenpyrad were 37.6% and 5.4%, which were much higher than fordinotefuran at 24.7% and 0.84%, respectively. The data indicated that there wasno significant health risk in tea for consumers at the recommended dosages. Theresults provide scientific data regarding the reasonable use of tolfenpyrad anddinotefuran aiming to ensure safe tea consuption.
- 所属专题：
- 60
