三种不同剂型的醚菊酯在稻田中的残留降解研究

将10%TrebonFL、5%TrebonWP和4%TrebonOL施于水稻田,采用气相色谱分析技术研究了它们在稻田中的残留降解行为。结果表明:(1)3种剂型的醚菊酯施于稻田后,醚菊酯在稻田中的降解符合方程式:Ct=Coe-kt;(2)醚菊酯在稻田中的残留分布规律为:稻株>稻田土壤>稻田水;它在稻株中的分布为:稻草>谷壳>糙米,表现出明显的接触性残留;(3)稻田中选择施用4%TrebonOL最为理想,不仅可以延长醚菊酯在稻田中的残留时间,保持稻田中醚菊酯有较高的残留水平,提高其防治效果,而且还可明显降低醚菊酯在糙米中的残留量,确保人们食用稻米的安全性。

Degradation of Etofenprox in Rice After Application with Three Formulations

s: The degradation of insecticide etofenprox in rice is studied in the present investigation with an aid of application with three formulations of 10%Trebon FL, 5%Trebon WP, and 4%Trebon OL, respectively. The results showedas follows: (1) The degradation of etofenprox in rice field could be described with equation: Ct=C0e-kt. (2) The residue distribution of etofenprox in rice field was: rice seedlings > rice soil > water of rice field. The residue distribution of etofenprox in rice plants was in an order: rice straw > rice hull > unpolished rice. Obvious, etofenprox was characterized by its contact action. (3) 4%Trebon OL was found to be a superior formulation. This could not only prolongthe residual time of etofenprox, maintain higher residual levels of etofenprox in the rice field, and increase biological efficiency, but also decrease obviously residue in the unpolished rice, and ensure edible safety of rice.