Residue Dynamics of Chlorothalonil and Its 4-Hydroxy Metabolite in Scallion  

作　　者：Ying CHENG Chenchen WANG Jun TANG 

机构地区：[1]Centre Testing International Technology(Anhui)Group Co.,Ltd.,Hefei 230068,China [2]Key Laboratory of Agricultural Product Quality and Safety of Anhui Province,Hefei 230036,China

出　　处：《Agricultural Biotechnology》2018年第5期219-221,237,共4页农业生物技术（英文版）

摘　　要：[Objectives] This study was conducted to explore the dissipation dynamics of chlorothalonil （2,4,5,6-tetrachloroisophthalonitrile） in scallion.[Methods] The level of residue and the dissipation of chlorothalonil and its main metabolite 4-hydroxy-2,5,6-trichloroisophthalonitrile in scallion in Beijing and Jiangsu experimental bases were determined via acetonitrile extraction and ultra-performance liquid chromatography coupled with ultraviolet detection （UPLC-UV）.[Results] The dissipation of chlorothalonil in scallion followed the first-order kinetic model and the half-life of chlorothalonil in scallion was 3.5-4.1 d. The final residue of chlorothalonil in scallion decreased over time after the last application. After chlorothalonil was applied at 1 050 or 1 575 g a.i./hm 2 3 or 4 times, the maximum residue level of chlorothalonil was 1.48, 1.21, 0.72 and 0.45 mg/kg 5, 7, 10 and 14 d after the last application, while that of its 4-hydroxy metabolite was 0.25, 0.19, 0.13 and 0.09 mg/kg, respectively.[Conclusions] The results may provide experimental evidence for evaluating the safety of the use of chlorothalonil in scallion.[Objectives] This study was conducted to explore the dissipation dynamics of chlorothalonil （2,4,5,6-tetrachloroisophthalonitrile） in scallion.[Methods] The level of residue and the dissipation of chlorothalonil and its main metabolite 4-hydroxy-2,5,6-trichloroisophthalonitrile in scallion in Beijing and Jiangsu experimental bases were determined via acetonitrile extraction and ultra-performance liquid chromatography coupled with ultraviolet detection （UPLC-UV）.[Results] The dissipation of chlorothalonil in scallion followed the first-order kinetic model and the half-life of chlorothalonil in scallion was 3.5-4.1 d. The final residue of chlorothalonil in scallion decreased over time after the last application. After chlorothalonil was applied at 1 050 or 1 575 g a.i./hm 2 3 or 4 times, the maximum residue level of chlorothalonil was 1.48, 1.21, 0.72 and 0.45 mg/kg 5, 7, 10 and 14 d after the last application, while that of its 4-hydroxy metabolite was 0.25, 0.19, 0.13 and 0.09 mg/kg, respectively.[Conclusions] The results may provide experimental evidence for evaluating the safety of the use of chlorothalonil in scallion.

关 键 词：CHLOROTHALONIL Scallion RESIDUE Dissipation rate 

分 类 号：S481.8[农业科学—农药学] O313[农业科学—植物保护]