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论文类型：期刊论文

发表时间：2020-03-01

发表刊物：ENVIRONMENTAL POLLUTION

收录刊物：PubMed、EI、SCIE

卷号：258

页面范围：113700

ISSN号：0269-7491

关键字：Dissolved organic matter; Antiviral drug; Photodegradation; Aquatic environment

摘要：Dissolved organic matter (DOM) is the most important light absorber that may induce indirect photolytic transformation of organic pollutants in natural waters. In this study, effects of DOM derived from freshwater and seawater on the photodegradation of three antiviral drugs acyclovir, lamivudine and zidovudine were investigated. Results show that the photodegradation of acyclovir is promoted mainly by excited triplet states DOM ((DOM)-D-3*), and the photodegradation of lamivudine is accelerated by 3DOM*, center dot OH and O-1(2) together: however, the photodegradation of zidovudine is inhibited by DOM mainly via light screening. Compared with DOM from freshwater, promotion effect of DOM extracted from seawater (SDOM) on the photodegradation of acyclovir and lamivudine is weaker, which is attributed to lower productivity of reactive intermediates. On the other hand, inhibitory effect of SDOM on the photodegradation of zidovudine is also weaker, which is due to weaker light screening caused by lower light absorption. Photodegradation half-lives of the three antiviral drugs are predicted to be all more than 20 days in freshwater and seawater bodies of the Yellow River estuarine region. These findings are significant for understanding the phototransformation processes of antiviral drugs and other organic pollutants in estuarine and coastal regions. (C) 2019 Elsevier Ltd. All rights reserved.