Dissipation and processing factors of emamectin benzoate and tolfenpyrad in tea (Camellia Sinensis)
甲维盐和唑虫酰胺在茶叶中的耗散及处理因素
- 关键词：
- 来源：
- Journal of Food Measurement and Characterization 期刊
- 类型：
- 学术文献
- 语种：
- 英语
- 原文发布日期：
- 2022-10-03
- 摘要：
- A reliable analytical method for thesimultaneous determination of emamect in benzoate and tolfenpyrad in fresh anddried tea (Camellia sinensis) leaveswas developed. We determined the dissipation of the two pesticides in fresh tealeaves from Jiangsu, Hunan, Guangxi, and Fujian provinces (China) usingdifferent dissipation kinetic curves. We found that the optimal model for bothcompounds was the combined first + first-order kinetic in most cases. Thehalf-lives of emamectin benzoate, calculated by the best-fit model, were 0.11–0.49d, while that of tolfenpyrad were 1.12–1.85 d. This indicated that the twopesticides quickly dissipated in the fresh tea leaves. In order to eliminatethe influence of water loss, we calculated the pesticide residues in fresh tealeaves based on dry weight and then calculated the processing factors in dryweight. The processing factors (dry weight) of emamectin benzoate andtolfenpyrad were found to be 0.23–0.98 and 0.18–0.67, respectively with lossrates of 1.6%–76.7%and 32.7%–82.1% determined for emamectin benzoate andtolfenpyrad residues during tea processing.
- 所属专题：
- 60
