Influence of Humic Acid on the Photolysis of Triclosan in Different Dissociation Forms
Influence of Humic Acid on the Photolysis of Triclosan in Different Dissociation Forms
复制标题
DOI：
10.1007/s11270-016-3024-7
复制
发表时间：
2016-08
期刊：
影响因子：
--
通讯作者：
Lei Chen;Zheng Wang;Zhulai Wang;X. Gu
中科院分区：
文献类型：
--
作者：
Lei Chen;Zheng Wang;Zhulai Wang;X. Gu
三氯生是水生环境中常见的抗菌剂，光解是三氯生的主要转化途径。虽然对溶解有机物对三氯生光解作用的影响进行了很多研究，但仍存在争议，其作用机制尚不清楚。研究了腐植酸对分子形态和阴离子形态三氯生光解反应的影响。鉴定了所涉及的反应物质，并提出了光解途径。腐植酸的加入显著促进了三氯生分子形态的光解反应，抑制了阴离子形态的三氯生光解反应。•OH和腐植酸对三氯生光解作用的增强起主导作用。提出了腐植酸存在下不同形态三氯生的不同光解途径，间接光解过程中未发现二恶英产物。在这里，我们表明腐植酸对不同形式的三氯生光解具有相反的作用。这些发现将有助于我们更好地了解三氯生在天然水体中的光解过程。
Photolysis is a major transformation pathway for triclosan, an antibacterial agent frequently detected in aquatic environment. Though many studies have been conducted on the influence of dissolved organic matter on the photolysis of triclosan, there are still controversies and the mechanism involved is still not clear. In the present study, influence of humic acid on the photolysis of triclosan in molecular form and anionic form was investigated. Reactive substances involved were identified and photolysis pathways were proposed. The addition of humic acid significantly enhanced the photolysis of triclosan in molecular form and inhibited that of triclosan in anionic form.•OH and intra-humic acid1O2played the dorminant role in the enhanced photolysis of triclosan. Different photolysis pathways of triclosan in different forms in the presence of humic acid were proposed, and dioxin products were not found during the indirect photolysis. Here, we show that humic acid has the opposing effects on the photolysis of triclosan in different forms. These findings will help us better understand the photolysis process of triclosan in natural waters.