甲萘威在液相中的光化学降解研究

摘要

以高压汞灯为光源,研究了甲萘威在液相中的光化学降解及影响因素.结果表明:甲萘威在不同溶剂中的光解均符合一级动力学方程.甲萘威的光解速率随初始浓度的增加而减小.在不同有机溶剂中的光解速率大小依次为正己烷＞甲醇＞乙腈,在碱性溶液中比中性和酸性溶液中光解快.NO3-、NO2-和SDS对甲萘威光解有一定的抑制作用,而H2O2则对甲萘威在水中的光解起到促进作用.%The photochemical degradation of carbryl in various solvents and the relevant effect factors were studied under the irradiation of high-pressure mercury lamp. The results showed that the photolysis rate of carbryl could be characterized by first-order kinetics equation. The photolysis rate of carbaryl decreased with the increase of initial concentration. The photolytic rates of carbryl in different organic solvents showed the following sequence: n-hexane > methanol > acetonitrile. The photolytic rate of carbryl in alkaline buffer solution was much greater than in acid or in neutral buffer solution. The presence of NO3-, NO2- and SDS inhibited carbryl photodegradation. The H2O2 could increase photolysis rate.