College of Chemistry and Environmental Science, Hebei University, Baoding, 071002, China.
Environ Sci Pollut Res Int. 2014 Feb;21(3):1993-2001. doi: 10.1007/s11356-013-2119-6. Epub 2013 Sep 10.
The photodegradation processes of fenpropathrin and λ-cyhalothrin were studied in hexane, methanol/water (1:1, v/v), and acetone in both ultraviolet light and simulated sunlight. Intermediates in the photodegradation process were identified using gas chromatography/mass spectrometry (GC/MS), and the analysis of intermediates was used to speculate on possible photodegradation pathways. The photodegradation processes of fenpropathrin and λ-cyhalothrin followed pseudo first-order kinetics. The photodegradation rates varied according to the solvent in decreasing order: hexane>methanol/water (1:1, v/v)>acetone. The effects of substances coexisting in the environment on the photodegradation of pyrethroids were also investigated in the research. Acetone, humic acid, and riboflavin increased photodegradation rates while L-ascorbic acid slowed the process. This study provides a theoretical basis for the removal of pyrethroid pollution from the natural environment.
研究了甲氰菊酯和高效氯氟氰菊酯在正己烷、甲醇/水（1:1，v/v）和丙酮中的光降解过程，分别在紫外光和模拟太阳光下进行。使用气相色谱/质谱（GC/MS）鉴定光降解过程中的中间产物，并通过分析中间产物推测可能的光降解途径。甲氰菊酯和高效氯氟氰菊酯的光降解过程遵循准一级动力学。光降解速率根据溶剂的不同按降序排列：正己烷>甲醇/水（1:1，v/v)>丙酮。本研究还考察了环境中共存物质对拟除虫菊酯光降解的影响。丙酮、腐殖酸和核黄素增加了光降解速率，而抗坏血酸则减缓了光降解速率。本研究为从自然环境中去除拟除虫菊酯污染提供了理论依据。
