摘要
[目的]为了明确苯并烯氟菌唑的光化学降解。[方法]采用了室内模拟光源,研究了苯并烯氟菌唑在不同pH缓冲溶液、水体、有机溶剂中的光化学降解。[结果]苯并烯氟菌唑的光化学降解符合一级动力学方程,在500 W氙灯照射下,苯并烯氟菌唑在碱性条件下的光解速率明显慢于酸性,pH 4、7、9的半衰期分别为31.5、33.0、43.3 d;在不同水样中的光解速率顺序为超纯水>湖泊水>稻田水;在500 W汞灯光照下,1.0、5.0、10.0 mg/L质量浓度的苯并烯氟菌唑在不同有机溶剂中的光解速率均为正己烷>乙腈>甲醇>丙酮。丙酮对苯并烯氟菌唑的光解起到了光猝灭作用,且随着苯并烯氟菌唑的浓度增大,降解速率变小,溶剂的极性与其降解速率无关。[结论]本试验结果可为苯并烯氟菌唑的环境安全性评价和科学使用提供参考依据。
[Aims]This study aims to clarify the photochemical degradation of benzovindiflupyr.[Methods]Using indoor simulated light source,the photochemical degradation of benzovindiflupyr in different pH buffer solutions,different water bodies and different organic solvents was studied.[Results]The photochemical degradation of benzovindiflupyr accords with the first-order kinetic equation.Under the irradiation of 500 W xenon lamp,the photolysis rate of benzovindiflupyr in alkaline condition is obviously slower than that in acidic condition,and the half-lives of pH 4,7 and 9 are 31.5,33.0 and 43.3 d respectively.The order of photolysis rate in different water samples is ultrapure water>lake water>paddy water.Under the illumination of 500 W mercury lamp and ultraviolet lamp,the photolysis rate of 1.0,5.0 and 10.0 mg/L benzovindiflupyr in different organic solvents is n-hexane>acetonitrile>methanol>acetone.Acetone can quench the photolysis of benzovindiflupyr,with the increase of the concentration of benzovindiflupyr,the degradation rate decreases,and the polarity of the solvent is independent of the degradation rate.[Conclusions]The results of this study can provide a reference for the environmental safety evaluation and scientific use of benzovindiflupyr.
作者
樊雨鑫
张晟
侯胜楠
刘涵菊
韩宏博
侯志广
逯忠斌
FAN Yu-xin;ZHANG Sheng;HOU Sheng-nan;LIU Han-ju;HAN Hong-bo;HOU Zhi-guang;LU Zhong-bin(College of Plant Protection,Jilin Agricultural University,Changchun 130118,China)
出处
《农药》
CAS
CSCD
北大核心
2022年第10期739-742,共4页
Agrochemicals
基金
农业农村部行业标准制定嘧菌环胺在人参中的残留限量标准(14202008)
关键词
苯并烯氟菌唑
光降解
水
PH
有机溶剂
benzovindiflupyr
photodegradation
water
pH
organic solvent
作者简介
樊雨鑫(1997—),男,硕士,从事农药残留分析与环境毒理研究。E-mail:1390282273@qq.com;通讯作者:逯忠斌,男,教授,博士生导师,从事农药残留分析与环境毒理研究。E-mail:luzong1979@aliyun.com。
