NDLI: Occurrence and photodegradation of methylmercury in surface water of Wen-Rui-Tang River network, Wenzhou, China

Content Provider	Springer Nature Link
Author	Pan, Shuihong Feng, Chuchu Lin, Jialu Cheng, Lidong Wang, Chengjun Zuo, Yuegang
Copyright Year	2017
Abstract	The spatial distribution and seasonal variations of methylmercury (MeHg) in Wen-Rui-Tang (WRT) River network were investigated by monitoring the MeHg concentrations in surface water samples collected from 30 sites across the river network over four seasons. Detection frequencies and concentrations of MeHg were generally higher in January, indicating that low sunlight irradiation, wind speed, and temperature conditions might enhance the persistence of MeHg in surface water. The MeHg levels varied with sampling locations, with the highest concentrations being observed in the industrial area especially around wastewater outfall, revealing that the mercury contamination in WRT River mainly comes from the industrial wastewater. Photodegradation of MeHg in WRT River surface water and the effects of natural constituents such as fulvic acid (FA), ferric ions (Fe$^{3+}$), nitrate (NO$_{3}$ $^{−}$), and dissolved oxygen on the MeHg photodegradation in aqueous solutions were studied under the simulated sunlight. The experimental data indicated that the indirect photodecomposition of MeHg occurred in WRT River surface water. Photodegradation of MeHg in FA solution was initiated by triplet $^{3}$FA* or MeHg-FA* via electron transfer interaction under light irradiations. The Fe$^{3+}$ and NO$_{3}$ $^{−}$ can absorb light energy to produce ·OH and enhance the photochemical degradation of MeHg. The MeHg photodecompositions in FA, nitrate, and Fe$^{3+}$ solutions were markedly accelerated after removing the dissolved oxygen.
Starting Page	11289
Ending Page	11298
Page Count	10
File Format	PDF
ISSN	09441344
Journal	Environmental Science and Pollution Research
Volume Number	24
Issue Number	12
e-ISSN	16147499
Language	English
Publisher	Springer Berlin Heidelberg
Publisher Date	2017-03-16
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Methylmercury Distribution Photodegradation Surface water WRT River network Environment Environmental Chemistry Ecotoxicology Environmental Health Atmospheric Protection/Air Quality Control/Air Pollution Waste Water Technology Water Pollution Control Water Management Aquatic Pollution
Content Type	Text
Resource Type	Article
Subject	Environmental Chemistry Health, Toxicology and Mutagenesis Pollution Medicine

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