本文主要研究内容
作者（2019）在《Photodegradation of 2-(2-hydroxy-5-methylphenyl) benzotriazole(UV-P) in coastal seawaters: Important role of DOM》一文中研究指出：Benzotriazole UV stabilizers(BT-UVs) have attracted concerns due to their ubiquitous occurrence in the aquatic environment, and their bioaccumulative and toxic properties.However, little is known about their aquatic environmental degradation behavior. In this study, photodegradation of a representative of BT-UVs, 2-(2-hydroxy-5-methylphenyl)benzotriazole(UV-P), was investigated under simulated sunlight irradiation. Results show that UV-P photodegrades slower under neutral conditions(neutral form) than under acidic or alkaline conditions(cationic and anionic forms). Indirect photodegradation is a dominant elimination pathway of UV-P in coastal seawaters. Dissolved organic matter(DOM) from seawaters accelerate the photodegradation rates mainly through excited triplet DOM(~3DOM~*), and the roles of singlet oxygen and hydroxyl radical are negligible in the matrixes. DOM from seawaters impacted by mariculture exhibits higher steady-state concentration of ~3DOM~*([~3DOM~*]) relative to those from pristine seawaters, leading to higher photosensitizing effects on the photodegradation. Halide ions inhibit the DOMsensitized photodegradation of UV-P by decreasing [~3DOM~*]. Photodegradation half-lives of UV-P are estimated to range from 24.38 to 49.66 hr in field water bodies of the Yellow River estuary. These results are of importance for assessing environmental fate and risk UV-P in coastal water bodies.
Abstract
Benzotriazole UV stabilizers(BT-UVs) have attracted concerns due to their ubiquitous occurrence in the aquatic environment, and their bioaccumulative and toxic properties.However, little is known about their aquatic environmental degradation behavior. In this study, photodegradation of a representative of BT-UVs, 2-(2-hydroxy-5-methylphenyl)benzotriazole(UV-P), was investigated under simulated sunlight irradiation. Results show that UV-P photodegrades slower under neutral conditions(neutral form) than under acidic or alkaline conditions(cationic and anionic forms). Indirect photodegradation is a dominant elimination pathway of UV-P in coastal seawaters. Dissolved organic matter(DOM) from seawaters accelerate the photodegradation rates mainly through excited triplet DOM(~3DOM~*), and the roles of singlet oxygen and hydroxyl radical are negligible in the matrixes. DOM from seawaters impacted by mariculture exhibits higher steady-state concentration of ~3DOM~*([~3DOM~*]) relative to those from pristine seawaters, leading to higher photosensitizing effects on the photodegradation. Halide ions inhibit the DOMsensitized photodegradation of UV-P by decreasing [~3DOM~*]. Photodegradation half-lives of UV-P are estimated to range from 24.38 to 49.66 hr in field water bodies of the Yellow River estuary. These results are of importance for assessing environmental fate and risk UV-P in coastal water bodies.
论文参考文献
论文详细介绍
论文作者分别是来自Journal of Environmental Sciences的，发表于刊物Journal of Environmental Sciences2019年11期论文，是一篇关于,Journal of Environmental Sciences2019年11期论文的文章。本文可供学术参考使用，各位学者可以免费参考阅读下载，文章观点不代表本站观点，资料来自Journal of Environmental Sciences2019年11期论文网站，若本站收录的文献无意侵犯了您的著作版权，请联系我们删除。