NDLI: Effects of dissolved organic matter on phototransformation rates and dioxin products of triclosan and 2′-HO-BDE-28 in estuarine water

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Environmental Science: Processes & Impacts Vol - 18 Issue - 8

Environmental Science: Processes & Impacts Vol - 18 Issue - 7

Environmental Science: Processes & Impacts Vol - 18 Issue - 6

Environmental Science: Processes & Impacts Vol - 18 Issue - 5

Effects of dissolved organic matter on phototransformation rates and dioxin products of triclosan and 2′-HO-BDE-28 in estuarine water

Content Provider	Royal Society of Chemistry (RSC)
Author	Yang, Kuixing Chen, Jingwen Zhou, Chengzhi Zhang, Ya-nan Sun, Guoxin Song, Shuainan Xie, Qing Li, Yingjie
Copyright Year	2016
Abstract	Photochemical transformation of hydroxylated polyhalodiphenyl ethers (HO-PXDEs) has attracted much attention for their ubiquitous presence and the photochemical formation of highly toxic dioxins. Dissolved organic matter (DOM) plays an important role in the environmental photochemical transformation of organic pollutants. However, the effects of DOM on the photolysis kinetics and dioxin formation of HO-PXDEs are still not fully understood. Herein, the effects of Suwannee River natural organic matter (SRNOM) on the phototransformation of 2′-HO-2,4,4′-trichlorodiphenyl ether (triclosan) and 2′-HO-2,4,4′-tribromodiphenyl ether (2′-HO-BDE-28) were investigated in artificial estuarine water (AEW). The results showed that although SRNOM induced indirect photolysis of triclosan and 2′-HO-BDE-28, it decreased the observed photolytic rate constants due to light screening, static quenching and dynamic quenching effects. The above effects were quantified firstly. Direct photolysis is more important than indirect photolysis in the transformation of the target compounds and the production of dioxins. SRNOM increased the dioxin yields of the two HO-PXDEs. It was also found that SRNOM decreased the formation rate constant (kp) of 2,8-dichlorodibenzo-p-dioxin (2,8-DCDD) from triclosan and showed no obvious influence on the kp of 2,8-dibromodibenzo-p-dioxin (2,8-DBDD) from 2′-HO-BDE-28. SRNOM showed no obvious influence on the degradation of 2,8-DCDD, while it increased the degradation rate constant of 2,8-DBDD. The promoting effect on the degradation of 2,8-DBDD was attributed to the formation of chloride radicals with the concurrence of SRNOM and Cl− in AEW. This study revealed the roles of SRNOM in the photochemical transformation of HO-PXDEs and the photochemical formation and degradation of dioxins, which is important for elucidating the transformation fate of HO-PXDEs in aquatic environments.
Starting Page	1177
Ending Page	1184
Page Count	8
File Format	HTM / HTML PDF
ISSN	20507887
Volume Number	18
Issue Number	9
Journal	Environmental Science: Processes & Impacts
DOI	10.1039/c6em00122j
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	SRNOM AEW Suwannee River Photochemistry Dioxins and dioxin-like compounds Dissolved organic carbon Document Object Model Photodissociation Ether Triclosan Estuary
Content Type	Text
Resource Type	Article
Subject	Environmental Chemistry Public Health, Environmental and Occupational Health Management, Monitoring, Policy and Law

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