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Title: Speciation and Mobility of Selected Trace Metals (As, Cu, Mn, Pb and Zn) in Sediment with Depth in Cam River-Mouth, Haiphong, Vietnam
Authors: Ho, Huu Hieu ×
Swennen, Rudy
Cappuyns, Valérie
Vassilieva, Elvira
Van Gerven, Tom
Van Tran, T #
Issue Date: 2013
Publisher: Kluwer Academic Publishers
Series Title: Aquatic Geochemistry vol:19 issue:1 pages:57-75
Abstract: The speciation and mobility of some selected trace metals (As, Cu, Mn, Pb and Zn) in sediments with depth was investigated in the Cam River-mouth (Vietnam) by collecting sediment cores and analysing porewater and sediment composition, complemented with single (ammonium-EDTA) and sequential (BCR 3-step) extractions and mineralogical analysis (XRD). All trace metals show overall decreasing trends with depth in porewater as a result of anthropogenic input in upper sediment layers. High porewater concentrations of As, Mn and Pb in oxic and suboxic sediment layers may result in groundwater pollution. Sediment-bound Pb and Mn dominate in the reducible and the acidsoluble fraction, respectively, while Cu and Zn distribute rather evenly between four extracted fractions. The porewater metal speciation, as predicted by a geochemical model Visual MINTEQ version 3.0, indicates that the toxicity of Cu, Mn, Pb and Zn (presented by
the proportions of free metal ions) decreases with depth, while the toxicity of As increases when As(III) becomes more abundant. The dissolved concentrations of trace metals are not only controlled by the precipitation/dissolution of discrete hydroxide/oxide, carbonate and phosphate minerals, but also by sorption processes on major sorbents (i.e. As on goethite, and Mn and Zn on calcite and dolomite). Sulphide minerals do not show any control even
in the anoxic zone most likely because of the low concentration of sulphur.
ISSN: 1380-6165
Publication status: published
KU Leuven publication type: IT
Appears in Collections:Center for Research on Economic Markets and their Environments - HUB-EHSAL
Process Engineering for Sustainable Systems Section
Department of Earth and Environmental Sciences
Division of Geology
× corresponding author
# (joint) last author

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