文献类型： 外文期刊
作者： Zheng, Zhangyu 1 ; Zhang, Chunyan 1 ; Shi, Haiyan 1 ; Liu, Zhiwei 1 ; Duan, Jinsheng 2 ; Wang, Minghua 1 ;
作者机构： 1.Nanjing Agr univ, State & Local Joint Engn Res Ctr Green Pesticide, Coll Plant Protect, Dept Pesticide Sci, Nanjing 210095, Jiangsu, Peoples R China
2.Anhui Acad Agr Sci, Key Lab Agroprod Safety Risk Evaluat Hefei, Inst Plant Protect & Agroprod Safety, Hefei 230031, Anhui, Peoples R China
关键词： cyflufenamid; metabolite; photolysis pathway; photolysis; ultraviolet radiation
期刊名称：WATER SCIENCE AND TECHNOLOGY （ 影响因子：1.915； 五年影响因子：2.054 ）
ISSN： 0273-1223
年卷期： 2018 年 78 卷 2 期
页码：
收录情况： SCI
摘要： The photolysis of cyflufenamid (CFA) in different organic solvents and water under ultraviolet irradiation was investigated. The photolytic rate constant and photolytic half-life were measured for the different solutions. Factors influencing the photolysis of CFA were investigated, including initial concentration, types of solvent, pH, occurrence of catalyst (TiO2), and environmental substances (Fe3+, Fe2+, NO3-, NO2-). Photolysis of CFA followed first-order kinetics in various systems, and the photolytic rate of CFA decreased with increased initial concentration. Photolytic rates of CFA in different solvents were as follows: n-hexane > methanol > acetonitrile > ultrapure water > ethyl acetate. The pH had a significant effect on the photolysis of CFA, and the photolysis rate reached its peak at pH 9.0. NO2- and TiO2 had positive effects on the photolysis of CFA, while Fe2+ had an adverse effect. NO3- in aqueous solution had no effect on the photolysis of CFA. In addition, the rates of photolysis were accelerated at lower concentrations of Fe3+ (0.5-5 mmol L-1) and decreased at higher concentrations (10 mmol L-1). Moreover, a main photolytic product of CFA was confirmed to be N-cyclopropoxy-2,3-difluoro-6-(trifluoromethyl)benzamide, and cleavage of the amido bond was proposed to be the predicted photolysis pathway in n-hexane.
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