College of Chemistry and Environmental Science, Hebei University, Baoding 071002, China.
J Environ Sci (China). 2010;22(7):1123-8. doi: 10.1016/s1001-0742(09)60227-8.
To understand the degradation and environmental fate of pyrethroids, the process of their photodegradation under simulated natural conditions was investigated. The results showed that the degradation process follows first-order kinetics. The degradation intermediates were identified with gas chromatography-mass spectrometry. A plausible mechanism was discussed to explain the process. Several influences on degradation process were investigated and reported such as the effects of initial concentration of pyrethroids, total time of light irradiation, solvents, and light source, as well as the effect of a few substances that exist in the environment. This study could be a good reference for the degradation of pyrethroids in practical circumstances.
为了了解拟除虫菊酯的降解和环境归宿，研究了它们在模拟自然条件下的光降解过程。结果表明，降解过程遵循一级动力学。用气相色谱-质谱法鉴定了降解中间体。讨论了一个合理的机制来解释这个过程。研究并报道了几种对降解过程的影响，如拟除虫菊酯的初始浓度、光照总时间、溶剂和光源的影响，以及环境中存在的几种物质的影响。本研究可为拟除虫菊酯在实际环境中的降解提供良好的参考。
