Source of sediments and metal fractionation in two Chinese estuarine marshes |
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Authors: | Xuyin Yuan Ying Chen Bing Li Donald I Siegel |
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Institution: | (1) Key Laboratory of Integrated Regulation and Resource Development on Shallow Lakes, College of Environmental Science and Engineering, Hohai University, 1 Xikang Road, Nanjing, China;(2) Department of Earth Sciences, Syracuse University, Syracuse, USA |
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Abstract: | The Changjiang and the Jiulong Estuaries, located in eastern and southeastern China, respectively, have different geomorphologic
and tidal processes as well as anthropogenic development in their associated watersheds. Sediments in the Changjiang estuary
mostly consist of SiO2, CaO and MgO (mean percentages of 63.9, 4.34 and 2.35%), whereas sediments from the Jiulong estuary mostly consist of Al2O3, Fe2O3 and organic matter (mean percentages 19.2, 6.82 and 4.14%). The Jiulong estuarine sediments contain more than twice the concentrations
of Pb, Zn, Cu, than those from the Changjiang estuary. In the Jiulong estuary, these heavy metals are associated with carbonates
and organic matter, whereas in the Changjiang estuary, they are associated with residual fractions or clay. Sediments from
the Changjiang estuary, mostly sediments with little organic matter, do not efficiently sequester anthropogenic-derived trace
metals. In contrast, sediments from the Jiulong estuary consist of a mixture of fluvial and marine matter which can sequester
heavy metals contributed by larger landscapes with industrial and municipal wastewater. |
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