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Characteristics of dissolved organic matter (DOM) and relationship with dissolved mercury in Xiaoqing River-Laizhou Bay estuary, Bohai Sea, China

文献类型： 外文期刊

作者： Jiang, Tao 1 ; Skyllberg, Ulf 2 ; Bjorn, Erik; Green, Nelson W.; Tang, Jianhui 3 ; Wang, Dingyong 1 ; Gao, Jie 1 ;

作者机构： 1.Southwest Univ, Key Lab Ecoenvironm Gorges Reservoir Reg 3, Chongqing Key Lab Agr Resources & Environm, Minist Educ,Coll Resources & Environm,Dept Enviro, Chongqing 400716, Peoples R China

2.Swedish Univ Agr Sci, Dept Forest Ecol & Management, SE-90183 Umea, Sweden

3.Chinese Acad Sci, Key Lab Coastal Environm Proc & Ecol Remediat, Yantai Inst Coastal Zone Res, Yantai 264003, Pe

关键词： Dissolved organic matter;Fluorescence;UV-Vis absorption;Bohai Sea;Laizhou Bay;Mercury

期刊名称：ENVIRONMENTAL POLLUTION （ 影响因子：7.6； 五年影响因子：8.3 ）

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收录情况： SCI

摘要： Because of heterogeneous properties, dissolved organic matter (DOM) is known to control the environmental fate of a variety of organic pollutants and trace metals in aquatic systems. Here we report absorptive and fluorescence properties of DOM, in concurrence with concentrations of dissolved mercury (Hg), along the Xiaoqing River-Laizhou Bay estuary system located in the Bohai Sea of China. A mixing model consisting of the two end-members terrestrial and aquatic DOM demonstrated that terrestrial signatures decreased significantly from the river into the estuary. Quasi-conservative mixing behavior of DOM sources suggests that the variations in the average DOM composition were governed by physical processes (e.g., dilution) rather than by new production and/or degradation processes. In contrast to some previous studies of river-estuary systems, the Xiaoqing River-Laizhou Bay estuary system displayed a non-significant correlation between DOM and Hg quantities. Based on this and the variation of Hg concentration along the salinity gradient, we concluded that Hg showed a non-conservative mixing behavior of suggested end-member sources. Thus, rather than mixing, Hg concentration variations seemed to be controlled by biogeochemical processes. (C) 2016 Elsevier Ltd. All rights reserved.

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