摘要
[目的]为明确氟啶虫胺腈在茶叶中的残留消解动态及安全性.[方法]应用气相色谱检测氟啶虫胺腈在茶叶中的残留量和消解率,并从药剂理化性质、毒性和膳食暴露风险方面综合评估该药剂的使用安全性.[结果]氟啶虫胺腈 2 种施用剂量在茶叶中的残留量均较低,且随时间的推移呈负指数函数递减,残留消解动态均符合一级动力学方程,药后 16 d的消解率均在 79.00%以上,药后 32 d残留量最高也仅 0.089 mg/kg,其施用剂量的残留半衰期为 8.66～9.76 d;氟啶虫胺腈在理化性质和毒性方面的累计安全性评价值为 11,2 种施用剂量的膳食暴露风险商值(RQ)为 0.004 和 0.006.[结论]综上,氟啶虫胺腈在茶叶中属于易消解农药,残留量和膳食暴露风险低,可在茶园推广使用,研究结果可为该药剂在茶叶上合理使用和最大允许残留限量(MRL)的制定提供参考.
Abstract
[Objective]To determine the residue and dissipation dynamics and safety of sulfoxaflor in tea.[Method]The residue and dissipation rate of sulfoxaflor in tea were detected by gas chromatography.The security of this insecticide was comprehensively evaluated from aspects of physicochemical properties,toxicity and dietary exposure risk.[Result]The residue of two doses of sulfoxaflor in tea were low and decreased negatively exponentially as time went by.Residue and dissipation dynamics followed the first-order kinetic equation.The dissipation rates of two doses were more than 79.00%after 16 days of treatment.The highest residue of two doses were was only 0.089 mg/kg after 32 days of treatment.The residual half-life of two doses were 8.66～9.76 d.The cumulative security rating of sulfoxaflor in physicochemical properties and toxicity was 11.The risk quotient(RQ)of dietary exposure for two doses were 0.004 and 0.006,respectively.[Conclusion]Sulfoxaflor is an easily dissipated insecticide in tea with low residue and dietary exposure risk which could be widely used in tea plantation.This study can provide references for the rational application and formulation of maximum residue limit(MRL)for sulfoxaflor in tea.
维普
万方数据