Photochemical transformation of sunscreen agent benzophenone-3 and its metabolite in surface freshwater and seawater
| Autor: | Zhiqiang Fu, Jingwen Chen, Ya-nan Zhang, Yingjie Li, Chengzhi Zhou, Xianliang Qiao |
|---|---|
| Rok vydání: | 2016 |
| Předmět: |
Environmental Engineering
010504 meteorology & atmospheric sciences Health Toxicology and Mutagenesis Metabolite Fresh Water 010501 environmental sciences Photochemistry 01 natural sciences Benzophenones chemistry.chemical_compound Dissolved organic carbon Benzophenone Environmental Chemistry Seawater Reactivity (chemistry) Photodegradation Scavenging 0105 earth and related environmental sciences Photolysis Public Health Environmental and Occupational Health Water General Medicine General Chemistry Pollution chemistry Environmental chemistry Hydroxyl radical Sunscreening Agents Water Pollutants Chemical |
| Zdroj: | Chemosphere. 153:494-499 |
| ISSN: | 0045-6535 |
| Popis: | The occurrence of sunscreen agents and their metabolites in surface waters gives rise to public concerns. However, little is known about the environmental fate of these pollutants at present, especially for their metabolites. In this study, we investigated the photochemical of sunscreen agents and their metabolites in natural waters, adopting benzophenone-3 (BP-3) and its human metabolite 4-hydroxybenzophenone (4-OH-BP3) as examples. Results show that only anionic forms of both BP-3 and 4-OH-BP3 can undergo direct photodegradation. The photolytic rates of both compounds in natural waters are faster as compared to those in pure water. Radical scavenging experiments revealed that triplet-excited dissolved organic matter ((3)DOM(∗)) was responsible for the indirect photodegradation of BP-3 and 4-OH-BP3 in seawater, whereas in freshwater, the indirect photodegradation of these two compounds was attributed to (3)DOM(∗) and ·OH. (1)O2 plays a negligible role in their photodegradation because of the weak (1)O2 reactivity. Furthermore, we probed the contribution of ·OH and (3)DOM(∗) to the photodegradation of both compounds in freshwater, and the results revealed that ·OH accounted for 56% and 59% of the observed photodegradation for BP-3 and 4-OH-BP3, respectively, whereas (3)DOM(∗) accounted for 43% and 12% of the observed photodegradation for BP-3 and 4-OH-BP3, respectively. These results are helpful in assessing the ecological risk of BP-3 and its metabolite in the aquatic environment. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Full Text from ScienceDirect