农药阿维菌素在水中的光解动态及机理

为了科学评价农药阿维菌素的环境安全性,采用室内模拟方法研究了其在水环境中的光解动态,考察了波长、光强和添加物质等对阿维菌素光降解的影响,进而利用LC/MS鉴定了其主要降解产物,并对降解机理进行了初步探讨.结果表明:紫外灯辐射波长对阿维菌素的光解速率影响较大,波长越短,越有利于阿维菌素的光降解;模拟太阳光强度越大,阿维菌素的光解速率越快;1%H_2O_2、0.1%TiO_2和10%丙酮作为添加物质都能加快阿维菌素的光解进程;通过分析阿维菌素光解产物的TIC图和质谱图,可能主要有两种代谢产物,分析了其降解途径及机理.

The photolysis dynamics and mechanism of pesticide Abamectin in water

In ordor to evaluate comprehensively environmental risk of pesticide Abamectin, the photolysis dynamics of Abamectin in water was studied. Moreover, the effects of wavelength, intensity of simulative sunshine and different matter appended on the photolysis rate were researched. Finally the photolysis products were identified by LC/MS, and the degradation mechanism was put forward. The results showed that the radiation wavelength of ultraviolet lamp had obvious effect on the photolytic degradation rate, and shorter wavelength was more favorable for the photolytic degradation; When the intensity of simulative sunshine became stronger, the photolytic degradation rate increased; Moreover, the photolytic degradation could be accelerated added by different matter such as 1% H_2O_2, 0.1% TiO_2 and 10% acetone; Two possible photolysis products of Abamectin were found by the analysis of TIC and MS chromatogram, and their retention time was 6.201 and 14.344 min, and molecular weight(MW) was 450 and 642 respectively; At last possible pathway of Abamectin photolysis was put forward.