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- Title
Photodegradation of Mefenamic Acid in Aqueous Media: Kinetics, Toxicity and Photolysis Products.
- Authors
Chen, Ping; Wang, Feng; Yao, Kun; Ma, Jing; Li, Fu; Lv, Wen; Liu, Guo
- Abstract
The present study investigated the photolytic behavior and photodegradation products of mefenamic acid (MEF) under ultraviolet-C irradiation. The results demonstrated that the photodegradation of MEF followed pseudo-first-order kinetics and the direct photolysis quantum yield of mefenamic acid was observed to be 2.63 ± 0.28 × 10. Photodegradation of MEF included degradation by direct photolysis and by self-sensitization that the contribution rates of self-sensitized photodegradation were 5.70, 11.25 and 18.96 % for OH, O and $${\text{O}}_{2}^{ \cdot - }$$ , respectively. Primary transformation products of MEF were identified using ultra performance liquid chromatography and quadrupole time-of-flight mass spectrometer (UPLC-Q-TOF-MS). The identified transformation products suggested three possible pathways of MEF photodegradation: dehydrogenation, hydroxylation, and ketonized reactions. Toxicity of phototransformation products were evaluated using the Microtox test, which revealed that photodegradation likely provides a critical pathway for MEF toxicity reduction in drinking water and wastewater treatment facilities.
- Subjects
PHOTODEGRADATION; MEFENAMIC acid; AQUEOUS solutions; PHOTOLYSIS (Chemistry) kinetics; ULTRAVIOLET radiation
- Publication
Bulletin of Environmental Contamination & Toxicology, 2016, Vol 96, Issue 2, p203
- ISSN
0007-4861
- Publication type
Article
- DOI
10.1007/s00128-015-1680-8