Identification and Characterization of Herbicide Penoxsulam Transformation Products in Aqueous Media by UPLC-QTOF-MS

文献类型： 外文期刊

第一作者： Chen, Guofeng

作者： Chen, Guofeng;Qiao, Yuxin;Tao, Bo;Chen, Guofeng;Zhang, Xiaobo;Liu, Feng;Liao, Hui;Zhang, Ruiying;Dong, Jiannan

作者机构：

关键词： Penoxsulam; Photodegradation; Transformation products; UPLC-QTOF-MS

期刊名称：BULLETIN OF ENVIRONMENTAL CONTAMINATION AND TOXICOLOGY （ 影响因子：2.151； 五年影响因子：2.129 ）

ISSN： 0007-4861

年卷期： 2019 年 102 卷 6 期

页码：

收录情况： SCI

摘要： Photodegradation is an important non-biodegradation process of pesticide degradation in aquatic environments. In this study, the effect of different forms of nitrogen on the photodegradation kinetics of penoxsulam was investigated. The photodegradation of penoxsulam was accelerated by NO3- and NO2- but was not affected by NH4+. Ultra-high-performance liquid chromatography coupled with time-of-flight mass spectrometry was used to separate and identify the transformation products (TPs)converted by photodegradation of penoxsulam in an aqueous solution under UV-Vis (290-800nm) irradiation. Seven major transformation products were identified based on mass spectral data. The structure was determined by elemental composition calculations, comparison of structural analogs, and existing literature. The main pathways of photodegradation were found to be sulfonamide bond cleavage, rearrangement, triazole ring cleavage, and hydroxylation. These findings are critical to elucidate the environmental fate of penoxsulam in aquatic ecosystems and provide a basis for further environmental risk assessment.

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