农药吡虫啉和噻虫嗪的电子束辐照降解效果及机理分析  

Degradation Effect and Mechanism Analysis of Pesticides Imidacloprid and Thiamethoxam by Electron Beam Irradiation

作　　者：魏强林[1,2,3] 杨波 张建波 聂晨[2] 刘军涛 刘义保 刘志毅 WEI Qianglin;YANG Bo;ZHANG Jianbo;NIE Chen;LIU Juntao;LIU Yibao;LIU Zhiyi(Engineering Research Center of Nuclear Technology Application,Ministry of Education,East China University of Technology,Nanchang 330013,China;School of Nuclear Science and Engineering,East China University of Technology,Nanchang 330013,China;Jiangxi Province Key Laboratory of Nuclear Physics and Technology,East China University of Technology,Nanchang 330013,China;College of Nuclear Science and Technology,Lanzhou University,Lanzhou 730000,China;Center for Frontier Science of Rare Isotopes,Lanzhou University,Lanzhou 730000,China)

机构地区：[1]东华理工大学核技术应用教育部工程研究中心,江西南昌330013 [2]东华理工大学核科学与工程学院,江西南昌330013 [3]东华理工大学核物理与核技术江西省重点实验室,江西南昌330013 [4]兰州大学核科学与技术学院,甘肃兰州730000 [5]兰州大学稀有同位素前沿科学中心,甘肃兰州730000

出　　处：《东华理工大学学报(自然科学版)》2024年第6期592-600,共9页Journal of East China University of Technology(Natural Science)

基　　金：核技术应用教育部工程研究中心开放基金项目(HJSJYB2021-9);东华理工大学博士启动基金项目(DHBK2021005);江西省自然科学基金面上项目(20242BAB25048);国家自然科学基金项目(11965001)。

摘　　要：为深入分析农药辐照降解机理,采用电子束辐照降解技术研究典型新烟碱类农药吡虫啉和噻虫嗪在1~5 kGy吸收剂量下的辐照降解效果及影响因素,并分析了农药降解途径及其机理。结果显示,电子束辐照能有效降解吡虫啉和噻虫嗪,降解率与吸收剂量呈正相关、与农药的初始质量浓度呈负相关,中性酸碱度和低浓度双氧水对农药降解有促进作用。吡虫啉和噻虫嗪依靠辐解产生的对农药降解有促进作用的·OH自由基、·H自由基和水合电子e_(aq)~-作用于N-硝基亚氨基咪唑烷结构、四氢噁二嗪结构使其降解,最终产物分别为6-氯烟酸、2-氯噻唑-5-甲胺。In order to further analyze the mechanism of pesticide irradiation degradation,the irradiation degradation effects and influencing factors of typical neonicotinoid pesticides imidacloprid and thiamethoxam from 1 kGy to 5 kGy absorbed dose were studied by electron beam irradiation degradation technology,and the degradation pathway and mechanism of pesticides were analyzed.The results showed that the degradation rate of imidacloprid and thiamethoxam could be effectively degraded by electron beam irradiation.The degradation rate was positively correlated with the absorbed dose and negatively correlated with the initial mass concentration of pesticides.The neutral solution and low hydrogen peroxide concentration could promote the degradation of pesticides.Through the analysis of irradiation products and their degradation pathways,it was found that imidacloprid and thiamethoxam mainly rely on·OH radical,·H radical and hydrated electron e aq-to degrade n-nitroimidazolidane structure and tetrahydrooxadiazine structure.These free radicals and hydrated electrons are produced by irradiation and can promote the degradation of pesticides.The final degradation products of imidacloprid and thiamethoxam were 6-chloronicotinic acid and 2-chlorothiazole-5-methylamine,respectively.

关 键 词：电子束辐照 新烟碱类农药 降解产物 降解效果 降解机理 

分 类 号：TL99[核科学技术—核技术及应用]