Degradation of estriol (E3) and transformation pathways after applying photochemical removal processes in natural surface water
| Autor: | William Michelon, Taise Perondi, Regina de Fátima Peralta Muniz Moreira, J. K. Bohrer, Ticiane Sauer Pokrywiecki, A. Basso, Helen Treichel, Rosely A. Peralta, Elisângela Düsman, Tauani Gabriela Fonseca, Aline Viancelli |
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| Rok vydání: | 2020 |
| Předmět: |
Environmental Engineering
010504 meteorology & atmospheric sciences Estriol Aquatic ecosystem Kinetics Water Hydrogen Peroxide Oxidative phosphorylation 010501 environmental sciences Biodegradation Photochemical Processes Photochemistry 01 natural sciences chemistry.chemical_compound chemistry Degradation (geology) Hydroxyl radical Chronic toxicity Surface water Ecosystem 0105 earth and related environmental sciences Water Science and Technology |
| Zdroj: | Water Science and Technology. 82:1445-1453 |
| ISSN: | 1996-9732 0273-1223 |
| DOI: | 10.2166/wst.2020.411 |
| Popis: | Steroidal hormones such as estriol (E3), are resistant to biodegradation; hence their removal by conventional treatment systems (aerobic and anaerobic) facilities is limited. These substances are detected in surface water, and present risks to the aquatic ecosystem and humans via potential biological activity. Photochemical treatments can be used to remove E3; however, just a few studies have analyzed the kinetics, intermediates, and E3 degradation pathways in natural surface water. In this study, the behavior of E3 under ultraviolet irradiation associated with H2O2, O3 or TiO2 was investigated to determine the degradation potential and the transformation pathways in reactions performed with a natural surface water sample. E3 degradation kinetics (200 ppb) fitted well to the pseudo-first-order kinetics model, with kinetic constant k in the following order: kUV/O3 > kUV/TiO2 > kUV/H2O2 > kUV. The mechanism of degradation using different advanced oxidative processes seemed to be similar and 12 transformation byproducts were identified, with 11 of them being reported here for the first time. The byproducts could be formed by the opening of the aromatic ring and addition of a hydroxyl radical. A possible route of E3 degradation was proposed based on the byproducts identified, and some of the byproducts presented chronic toxicity to aquatic organisms, demonstrating the risks of exposure. |
| Databáze: | OpenAIRE |
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