期刊
WATER RESEARCH
卷 52, 期 -, 页码 83-91出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.watres.2013.12.039
关键词
Fluconazole; Reactive oxygen species; Quantum yields; Photodegradation; By-products; Toxicity
资金
- Natural Science Foundation of China [NSFC U1133005, 21037001]
- CAS [KZCX2-EW-108, KZZD-EW-09, KZCX2-YW-JC105]
The azole fungicide fluconazole has been reported to be persistent in conventional wastewater treatment plants. This study investigated the photodegradation of fluconazole under UV-254 in aqueous solutions. The results revealed that the photodegradation of fluconazole was pH-dependent (2.0-12.0) following the pseudo-first-order kinetics with quantum yield values ranging from 0.023 to 0.090 mol einstein(-1), and it underwent a direct and self-sensitized mechanism involving O-1(2). The main photodegradation by-products were identified and semi-quantitated. The proposed photodegradation pathway included hydroxylative defluorination reaction. The 72 h-NOEC and 72 h-LOEC values for fluconazole using a freshwater unicellular green alga Pseudokirchneriella subcapitata were 10 mu M and 15 mu M. Overall, the photodegradation of fluconazole produced a significant decrease in algal toxicity. It also proved that the photodegradation by-products will not present extra toxicity to this alga than fluconazole itself. (C) 2014 Elsevier Ltd. All rights reserved.
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