氟苯虫酰胺光解动力学及机理研究

为研究硝酸根离子和不同pH缓冲溶液对氟苯虫酰胺的光化学降解行为的影响，采用液液分配提取、高效液相色谱法测定在不同浓度的硝酸根离子存在时和不同pH缓冲溶液中氟苯虫酰胺的光解动态。研究结果表明，在300 W汞灯的照射下，氟苯虫酰胺在不同浓度硝酸根离子溶液中的光解半衰期为0.55~1.36 h；氟苯虫酰胺在酸性(pH 4)条件下光解速率最快，在中性(pH 7)条件下次之，在碱性(pH 9)条件下光解速率最慢。氟苯虫酰胺的光解反应符合一级反应动力学规律；硝酸根离子会抑制氟苯虫酰胺的光解；氟苯虫酰胺在不同缓冲溶液中的光解速率顺序为pH 4＞pH 7＞pH 9

Study on Flubendiamide Photolysis Kinetics and Its Mechanism

In order to study the influence of NO₃^- and buffer solutions of different pH on flubendiamide photochemical degradation, the author measured flubendiamide photochemical degradation under different NO₃^- concentration and buffer solutions of different pH by the method of liquid distribution extract and HPLC. The results showed flubendiamide photolysis half-life in different concentrations of NO₃^- was 0.55-1.36 h under 300 W mercury lamp irradiation. The rate of flubendiamide photolysis in acidic (pH 4) solution was the fastest, then was in neutral (pH 7) solution and it was the slowest in alkaline (pH 9) solution. Flubendiamide photolysis reaction conformed to the first order reaction kinetics. NO₃^- presence could decrease flubendiamide photodegradation rate. The rate of flubendiamide photolysis in different buffer solutions was pH 4＞pH 7＞ pH 9.