Degradation Dynamics of Pyrethroids in Cigarette Production Environment

• 作者: Chai Junhong Chen Ran Hou Ying Ma Juan Wei Bujian Wei Hong Yang Yan Zhao Jian Zhao Yunchuan Zou Quan
• 来源期刊: Plant Diseases and Pests(植物病虫害研究：英文版)
• 学科: 农学
• 年，卷（期）: pdapzwbchyj_2016,（4）
• 页码范围: 34-37
• 页数: 4页
• 分类号: S1

摘要

[Objective] In order to provide a reference for safe and reasonable use of pyrethroids in cigarette production,the degradation behaviors of three kinds of pyrethroids in cigarette production environment were studied. [Method]Three kinds of pyrethroids( permethrin,cyfluthrin and cis-cypermethrin) were administrated to two media( cut tobacco and iron sheet surface) in cigarette production environment at MRLs concentration,and the first sampling was conducted at 24 d post administration. Afterwards,sampling was performed once every 7 d,with a total of six times. The degradation rates of insecticides in different media were calculated,and degradation models were established. [Result] The contents of three kinds of insecticides in two media gradually declined with the prolongation of time,and degradation rates presented the trend of fast-slow-fast; the degradation rates of permethrin,cyfluthrin and cis-cypermethrin in cut tobacco at 36 d post administration were 97. 14%,88. 89% and 95. 38%,respectively; the degradation rates on iron sheet surface were 29. 95%,48. 99% and 40. 24%,respectively.The half lives of three kinds of insecticides in cut tobacco were 1- 2 d,while those on iron sheet surface were 6- 10 d. [Conclusion]The contents of three kinds of insecticides in two media gradually declined with the prolongation of time,and their degradation regularity accorded with first order kinetic equation.