甲萘威在液相中的光化学降解研究

Photochemical Degradation of Carbryl in Various Solvents

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 earbryl 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 photolytie rate of earbryl in al- kaline buffer solution was much greater than in acid or in neutral buffer solution. The presence of NO3 - , NO2- and SDS inhibited earbryl photodegradation. The H202 could increase photolysis rate.