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Photodegradation of tefuryltrione in water under UV irradiation: Identification of transformation products and elucidation of photodegradation pathway

文献类型： 外文期刊

作者： Chen, Guofeng 1 ; Liu, Feng 2 ; Qiao, Yuxin 1 ; Tao, Bo 1 ;

作者机构： 1.Northeast Agr Univ, Coll Agr, Harbin 150030, Heilongjiang, Peoples R China

2.Heilongjiang Acad Agr Sci, Safety & Qual Inst Agr Prod, Harbin 150086, Heilongjiang, Peoples R China

关键词： Tefuryltrione; Photodegradation; Transformation product; UPLC-QTOF-MS

期刊名称：CHEMOSPHERE （ 影响因子：7.086； 五年影响因子：6.956 ）

ISSN： 0045-6535

年卷期： 2019 年 227 卷

页码：

收录情况： SCI

摘要： Photodegradation is an important abiotic degradation process in the aquatic environment. In this study, the photodegradation of tefuryltrione in aqueous solution was investigated under UV-Visible irradiation. Effects of carbonate (CO32-), bicarbonate (HCO3-), nitrate (NO3-), hydrogen phosphate (HPO42-), potassium (K+), and ammonium (NH4+) on the photodegradation kinetics of tefuryltrione were evaluated. Results showed that tefuryltrione photodegradation was increased by HCO3-, CO32-, and NO3- in the range of 0.1 -10 mmol L-1; decreased by HPO42-; and insignificantly affected by K+ and Ma . Twelve main transformation products (TPs) were separated and identified on the basis of mass spectrum data assigned by elemental-composition calculations, comparison of structural analogs, and available literature. A tentative photodegradation pathway was further proposed depending on the identified TPs and their kinetic evolutions. Results indicated that TP 1 was generated by the hydroxyl that substituted for chlorine, TP 2 was formed by the cleavage of the ether bond of tefuryltrione, and TPs 3-6 were formed by the breakage of the C-C bond of the keto moiety of tefuryltrione. Further, TPs 9-12 were formed by the rearrangement of tefuryltrione-photodegradation products. These findings are highly important for elucidating the environmental fate of tefuryltrione in aquatic ecosystems. (C) 2019 Elsevier Ltd. All rights reserved.

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