胺菊酯在水中的光化学降解研究

目的]寻求治理水中胺菊酯污染的光化学降解途径。方法]研究了3种光源、2种浓度腐殖酸、3种色素和3种表面活性剂对水中胺菊酯农药光化学降解的影响。结果]不同光源对胺菊酯在水中光解的影响有较大差异,高压汞灯下胺菊酯降解最快,紫外光次之,太阳光最慢,光解半衰期分别为93.6、95.2和200.0 min。腐殖酸对胺菊酯光敏化作用显著,并随腐殖酸浓度的增加而迅速增强。高压汞灯照射下,核黄素、亚甲基蓝和甲基绿3种色素对胺菊酯均有一定程度的光敏化作用,其中核黄素作用最显著,随着核黄素浓度的增加,胺菊酯的光解率呈先上升后趋于平缓的趋势。非离子型表面活性剂Span-20对胺菊酯的光化学降解有很明显的光敏化作用。结论]该研究为水中胺菊酯农药的污染治理提供参考依据。

Study on the Photochemical Degradation of Tetramethrin in Water

Objective] The aim was to seek for the photochemical degradation approach of controlling tetramethrin pollution in water.Method] The influences of 3 light sources,2 humic acid concentrations,3 pigments and 3 surfactants on the photochemical degradation of tetramethrin pesticides in water were studied.Result] The influences of different light sources on the photodegradation of tetramethrin in water had bigger difference,tetramethrin degraded fastest under high pressure mercury lamp,secondarily under ultraviolet and slowest under sunlight and their photodegradation half lives were 93.6,95.2 and 200.0 min resp.Humic acid had significant photosensitization on tetramethrin,and its photosensitization increased rapidly as the humic acid concentration increased.Under the irradiation of high pressure mercury lamp,3 pigments such as lactoflavin,methylene blue and methyl green all had photosensitization on tetramethrin to some degree,in which the photosensitization of lactoflavin was most significant and along with the increment of lactoflavin concentration,the photodegradation rate of tetramethrin showed the trend of increasing first and then tending to slow.Non-ionic surfactant Span-20 had very obvious photosensitization on the photochemical degradation of tetramethrin.Conclusion] The study supplied reference for controlling tetramethrin pesticide pollution in water.