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Camille Gaulier, Chunyang Zhou, Yue Gao, Wei Guo, Marek Reichstädter, Tianhui Maa, Willy Baeyens, Gabriel Billon
Original Title
Investigation on trace metal speciation and distribution in the Scheldt estuary
Type
journal article in Web of Science
Language
English
Original Abstract
The biogeochemical behavior of Cd, Co, Cr, Cu, Ni and Pb along the historically polluted Scheldt estuary (Belgium - The Netherlands) was investigated in this study. As never studied before in this area, labile trace metals were measured using the passive sampling technique of Diffusive Gradients in Thin-films (DGT), while total dissolved and particulate trace metal concentrations were assessed using classic active sampling techniques. This dual approach allowed us to highlight the variations of trace metal speciation and distribution in the estuarine surface waters, considering environmental and physicochemical gradients along the transect. The large data set obtained was then compared with literature data of historical measurements along the Scheldt (from 1980 until now), but also from other estuaries. As emphasized by our results, trace metal mobility and partitioning along the Scheldt estuary was mainly driven by biogeochemical reactions which were strongly influenced by gradients of specific estuarine physico-chemical parameters, such as salinity, turbidity, temperature and so on. . Hence, all species of trace metals displayed a non-conservative behavior. More precisely, dissolved labile fractions of trace metals showed higher levels in the middle estuary, where many solubilization and remobilization processes occurred due to turbulent mixing mechanisms and an increasing salinity. Our study confirmed the decreasing trend historically observed for particulate metals along the Scheldt, as well as the rising concentrations recorded for dissolved trace metals which might also lead to an increase of their labile fraction measured by the DGT. Finally, these preliminary results suggested that a more regular monitoring of labile metal along the Scheldt estuary is essential to have an in-depth understanding of trace metal speciation and to review bioavailability of trace metals within estuarine ecosystems.
Keywords
Biogeochemical cycleTrace metal speciationDGTNon-conservativeScheldt estuary
Authors
Released
20. 11. 2020
ISBN
0048-9697
Periodical
Science of the Total Environment
Year of study
757
Number
143827
State
Kingdom of the Netherlands
Pages from
1
Pages to
13
Pages count
URL
https://doi.org/10.1016/j.scitotenv.2020.143827
BibTex
@article{BUT166138, author="Marek {Reichstädter} and Yue {Gao}", title="Investigation on trace metal speciation and distribution in the Scheldt estuary", journal="Science of the Total Environment", year="2020", volume="757", number="143827", pages="1--13", doi="10.1016/j.scitotenv.2020.143827", issn="0048-9697", url="https://doi.org/10.1016/j.scitotenv.2020.143827" }