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Research article2017Peer reviewedOpen access

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

Jiang, Tao; Skyllberg, Ulf; Bjorn, Erik; Green, Nelson W.; Tang, Jianhui; Wang, Dingyong; Gao, Jie; Li, Chuxian

Abstract

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.

Keywords

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

Published in

Environmental Pollution
2017, Volume: 223, pages: 19-30
Publisher: ELSEVIER SCI LTD

      SLU Authors

      • Sustainable Development Goals

      SDG6 Ensure availability and sustainable management of water and sanitation for all
      SDG14 Conserve and sustainably use the oceans, seas and marine resources for sustainable development

      UKÄ Subject classification

      Environmental Sciences

      Publication identifier

      DOI: https://doi.org/10.1016/j.envpol.2016.12.006

      Permanent link to this page (URI)

      https://res.slu.se/id/publ/92502