Photocatalytic transformation of acesulfame: Transformation products identification and embryotoxicity study
文献类型： 外文期刊
作者： Li, Adela Jing 1 ; Schmitz, Oliver J. 4 ; Stephan, Susanne 4 ; Lenzen, Claudia 4 ; Yue, Patrick Ying-Kit 5 ; Li, Ka 1 ;
作者机构： 1.Hong Kong Baptist Univ, Dept Chem, Kowloon Tong, Hong Kong, Peoples R China
2.Hong Kong Baptist Univ, Partner State Key Lab Environm & Biol Anal, Kowloon Tong, Hong Kong, Peoples R China
3.South China Agr Univ, Key Lab Trop Agroenvironm, Minist Agr China, Guangzhou 510642, Guangdong, Peoples R China
4.Univ Duisburg Essen, Fac Chem, Appl Analyt Chem, Essen, Germany
5.Hong Kong Baptist Univ, Dept Biol, Kowloon Tong, Hong Kong, Peoples R China
6.Chinese Acad Fishery Sci, Pearl River Fisheries Res Inst, Key Lab Trop & Subtrop Fish Breeding & Cultivat, Guangzhou 510380, Guangdong, Peoples R China
关键词： Acesulfame;Emerging contaminant;Catalytic UV irradiation;Transformation product;Transformation pathway;Embryotoxicity
期刊名称：WATER RESEARCH （ 影响因子：11.236； 五年影响因子：11.547 ）
ISSN：
年卷期：
页码：
收录情况： SCI
摘要： Artificial sweeteners have been recognized as emerging contaminants due to their wide application, environmental persistence and ubiquitous occurrence. Among them, acesulfame has attracted much attention. After being discharged into the environment, acesulfame undergoes photolysis naturally. However, acesulfame photodegradation behavior and identity of its transformation products, critical to understanding acesulfame's environmental impact, have not been thoroughly investigated. The present study aimed to fill this knowledge gap by a laboratory simulation study in examining acesulfame transformation products and pathways under UV-C photolysis in the presence of TiO2. Photodegradation products of acesulfame were isolated and analyzed using the LC-IM-QTOF-MS coupled with LC Ion Trap MS in the MS mode. Our results show six new transformation products that have not been previously identified. The molecular structures and transformation pathways were proposed. Further embryotoxicity tests showed that acesulfame transformation products at the low g L-1 level produced significant adverse effects in tail detachment, heart rate, hatching rate and survival rate during fish embryo development. The identification of additional transformation products with proposed transformation pathways of acesulfame, the increased toxicity of acesulfame after photolysis, and the fact that the accumulation of acesulfame transformation products is increasingly likely make acesulfame contamination even more important. Water resource control agencies need to consider legislation regarding acesulfame and other artificial sweeteners, while further studies are carried out, in order to protect the safety of this most vital resource. (C) 2015 Elsevier Ltd. All rights reserved.
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