氟吡草酮在水中的光化学降解  

Photochemical degradation of bicyclopyrone in water

作　　者：王雅贺 郭金博 赵庆慧 宋明霞 王丽娜 姜喜龙 于晓龙 高杉杉 李佳楠 逯忠斌 侯志广 WANG Yahe;GUO Jinbo;ZHAO Qinghui;SONG Mingxia;WANG Lina;JIANG Xilong;YU Xiaolong;GAO Shanshan;LI Jianan;LU Zhongbin;HOU Zhiguang(College of Plant Protection,Jinlin 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》2023年第11期807-811,822,共6页Agrochemicals

基　　金：吉林省自然科学基金新型杀线虫剂tioxazafen在水体及土壤环境中的降解归趋研究(YDZJ202201ZYTS475);吉林农业大学本科生科技创新基金溴虫氟苯双酰胺在人参中残留分析方法研究(S202110193073)。

摘　　要：[目的]明确氟吡草酮的环境行为规律,为氟吡草酮的合理使用及环境风险评估提供参考依据。[方法]基于《化学农药环境安全评价试验准则》推荐方法,室内模拟试验,在500 W汞灯照射下,采用高效液相色谱分析方法,研究了氟吡草酮在不同初始质量浓度(1、5、10 mg/L)、不同缓冲溶液(pH 4、7、9)、不同水体(湖水、河水、井水和稻田水)和几种离子水溶液中的光化学降解,明确其降解规律。[结果]水环境中氟吡草酮的光降解符合一级动力学方程。氟吡草酮的初始质量浓度与其光解速率成正相关。氟吡草酮在酸性条件下易光解,其光解速率顺序为pH 4>pH 7>pH 9。氟吡草酮在湖水、河水、井水和稻田水中的光降解半衰期分别为78.06、36.35、29.32、31.72 min。在水中添加不同质量浓度的Mn2+对氟吡草酮的光降解均起抑制作用。水溶液中NO3-离子的质量浓度为1、5 mg/L时会降低氟吡草酮的光解速率,为10、20 mg/L时会加快其光解。氟吡草酮在不同质量浓度Fe^(3+)离子下的光解速率大小依次为20 mg/L>10 mg/L>5 mg/L>1 mg/L。[结论]氟吡草酮的初始质量浓度增大,其光解速率加快。酸性条件比碱性条件更有利于氟吡草酮的光解。氟吡草酮在井水和水稻水中光解速率较快,在湖水中较慢。低浓度的NO3-和Fe^(3+)抑制氟吡草酮的光降解,高浓度的促进氟吡草酮的光降解。不同浓度的Mn2+对氟吡草酮的光降解均起猝灭作用。[Aims]This study aims to learn about the environmental behavior of bicyclopyrone and to provide reference for the rational use and environmental risk assessment of bicyclopyrone.[Methods]With a 500 W mercury lamp used as the light source,the photolysis of bicyclopyrone under different initial concentrations(1,5 and 10 mg/L),buffer solution(pH values of 4,7 and 9),water bodies(lake water,paddy water,well water and paddy water)and common ions were investigated based on the method recommended by China Test Guidelines on Chemical Pesticide Environmental Safety Assessment via high-performance liquid chromatography.[Results]The photolysis rule of bicyclopyrone in water environmental accorded with the first-order kinetic equation.The photolysis rate was positive correlated with initial mass concentration of bicyclopyrone.The photolysis rate of bicyclopyrone was fast in the acid condition with an order of pH 4>pH 7>pH 9.The photolysis half-life of bicyclopyrone in lake water,river water,well water and paddy water were 78.06,36.35,29.32 and 31.72 min,respectively.Adding different mass concentration of Mn2+inhibited the photolysis of bicyclopyron.NO3-decreased the photolysis at 1 and 5 mg/L,while accelerated the photolysis at 10 and 20 mg/L.The photolysis rate of bicyclopyrone in different mass concentration of Fe^(3+)was in the order of 20 mg/L>10 mg/L>5 mg/L>1 mg/L.[Conclusions]The photolysis rate of bicyclopyrone accelerate with the increase of its initial mass concentration.The acid condition was more favorable to the photolysis of bicyclopyrone than alkaline condition.The photolysis rate of bicyclopyrone was fast in paddy water and well water,but slow in lake water.NO3-and Fe^(3+)inhibited the photolysis of bicyclopyrone at low mass concentration,while promoted its photolysis at high concentration.Mn2+inhibited the photolysis of bicyclopyron at different mass concentration.

关 键 词：氟吡草酮 高效液相色谱法 水环境 光化学降解 

分 类 号：TQ450.2[化学工程—农药化工]