甲氧咪草烟在水中的光化学降解  

Photochemical degradation of imazamox in water

作　　者：侯胜楠 张晟 樊雨鑫 吕珍珍 刘涵菊 侯志广 逯忠斌 梁爽 HOU Sheng-nan;ZHANG Sheng;FAN Yu-xin;LYU Zhen-zhen;LIU Han-ju;HOU Zhi-guang;LU Zhong-bin;LIANG Shuang(College of Plant Protection,Jilin Agricultural University,Changchun 130118,China)

机构地区：[1]吉林农业大学植物保护学院,长春130118

出　　处：《农药》2022年第8期598-602,610,共6页Agrochemicals

基　　金：吉林省科技厅科技引导计划项目(20200354);吉林省教育厅科学技术研究项目(20200242)。

摘　　要：[目的]为明确甲氧咪草烟在水环境中的光解规律。[方法]通过室内模拟试验研究了500 W汞灯照射下甲氧咪草烟在水环境中的光解特性,并探讨了pH缓冲溶液、有机溶剂、腐殖酸、常见离子和TiO对甲氧咪草烟光化学降解的影响。[结果]甲氧咪草烟在缓冲溶液中光解速率为pH 9>pH 7>pH 4;有机溶剂中的光解速率依次为乙腈>正己烷>乙酸乙酯>二氯甲烷>甲醇>丙酮;在添加质量浓度为5 mg/L的腐殖酸条件下促进其光解,10~40 mg/L质量浓度下抑制其光解;质量浓度为5、10 mg/L的TiO、NO和Mn离子会加快其光解,20、40 mg/L的质量浓度下降低其光解速率;NH和Zn离子在5~40 mg/L添加质量浓度范围内对其光解表现为光敏化作用。[结论]文章可为甲氧咪草烟的科学合理使用以及环境风险评估提供数据支持。[Aims] This study aims to investigate the photolysis rule of imazamox in water environmental. [Methods] The photolysis characteristic of imazamox under 500 W mercury lamp in water environment were studied by laboratory simulation test method, and the effects of pH buffer solution, organic solvent, humic acid, common ions and TiOon the photochemical degradation of imazamox were discussed. [Results] The results showed that: the photolysis rate of imazamox in buffer solution was pH 9>pH 7>pH 4. The photolysis rates in organic solvents was acetonitrile>n-hexane>ethyl acetate>dichloromethane>methanol>acetone. In fortified concentration of humic acid at 5 mg/L promoted its photolysis, while the addition of humic acid at 10-40 mg/L inhibited its photolysis. TiO, NOand Mnat5 and 10 mg/L can accelerate the photolysis, while the photolysis rate decreased at 20 and 40 mg/L. In the range of 5-40 mg/L, both NHand Znions showed photosensitization. [Conclusions] The results of this study can provide data support for scientific and reasonable use and environmental risk assessment of imazamox.

关 键 词：甲氧咪草烟 水环境 光化学降解 影响因素 

分 类 号：TQ450.2[化学工程—农药化工]