Dissipation behavior and risk assessment of tolfenpyrad from tea bushes to consuming

文献类型： 外文期刊

第一作者： Wang, Xinru

作者： Wang, Xinru;Zhang, Xinzhong;Wang, Zihan;Zhou, Li;Luo, Fengjian;Chen, Zongmao;Wang, Xinru;Zhou, Li;Chen, Zongmao

作者机构：

关键词： Tea; Tolfenpyrad; Dissipation; Processing; Risk assessment

期刊名称：SCIENCE OF THE TOTAL ENVIRONMENT （ 影响因子：10.753； 五年影响因子：10.237 ）

ISSN： 0048-9697

年卷期： 2022 年 806 卷

页码：

收录情况： SCI

摘要： The dissipation behavior of tolfenpyrad, a widely used pyrazole insecticide in tea plantations, was investigated during tea bushes growing, manufacturing and brewing. Tolfenpyrad dissipated fast on the tea bushes with the half-lives of 1.8-2.3 days. Manufacturing processes of green tea and black tea further reduced the tolfenpyrad residue by 3.5%-36.4%. The average processing factors (PFs) of tolfenpyrad ranged from 0.68 to 1.40 and 0.84 to 1.30 during the processing of green tea and black tea, respectively. Then a low infusion factor of 9.8%-19.9% was observed during the brewing of made tea, as the water solubility of tolfenpyrad was only 0.087 mg/L. Therefore, more than 96% of the initial deposition of tolfenpyrad was dissipated and not accessible for consuming. Results of the risk quotient (RQ) assessment also indicated a negligible health risk by tea consumption. Results from this study indicated that the residue of tolfenpyrad can be reduced by proper field management, manufacturing and brewing processes, where field dissipation and brewing were key steps to minimize its risks. Data of this study could also provide guidance for rational application of tolfenpyrad in tea plantations. (c) 2021 Elsevier B.V. All rights reserved.

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