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RESEARCH ARTICLE

Benthic exchange of sedimentary metals (Cd, Cu, Fe, Mn, Ni and Zn) in the Deûle River (Northern France)

Beatriz Lourino-Cabana A , Ludovic Lesven A , Gabriel Billon A , Lionel Denis B C , Baghdad Ouddane A E and Abdel Boughriet A D
+ Author Affiliations
- Author Affiliations

A Université Lille Nord de France – CNRS UMR 8217 Géosystèmes, Equipe Chimie et Sédiment, Bâtiment C8, 59655 Villeneuve d’Ascq Cedex, France.

B Université Lille Nord de France – CNRS UMR 8187 LOG, Station Marine de Wimereux, 62930 Wimereux, France.

C IRD – UMR 6535 LOPB, Universidad Autónoma Metropolitana, Departamento de Hidrobiología/IRD, 09340 Iztapalapa, México DF, México.

D Université Lille Nord de France, Rue de l’université, PO Box 819, 62408 Béthune, France.

E Corresponding author. Email: Baghdad.ouddane@univ-lille1.fr

Environmental Chemistry 9(5) 485-494 https://doi.org/10.1071/EN12046
Submitted: 6 July 2011  Accepted: 6 October 2012   Published: 19 November 2012

Environmental context. Exchange processes at the water–sediment interface can release metals to riverine waters, having negative effects on organisms in the water column. We investigate the geochemical processes and metal exchange between the surface sediment and the overlying water under metal contamination conditions. Results suggest that the sediment can be a significant source of metal pollution in aquatic systems, particularly during anoxic events.

Abstract. Experiments were performed on the Deûle River (Northern France), which is strongly polluted by smelting plants, in the aim to investigate the influence of diagenetic processes and benthic macro-faunal activity on trace metal (Cd, Cu, Ni and Zn) and major metal (Fe, Mn) exchanges occurring at the water–sediment interface. Diffusive metal fluxes were determined from pore water metal concentration gradients measured in sediment cores. Benthic metal fluxes were evaluated using incubation chambers under dark conditions, and by further examining key variables (O2, CO2, redox potential and pH) affecting metal release and sequestration processes. As a whole, it was demonstrated that benthic fluxes were strongly dependent upon medium oxygenation and generation of colloidal iron oxides and hydroxides at the overlying water–sediment interface, raising the possibility of trace-metal adsorption and (co)precipitation.

Additional keywords: colloids, diffusive flux, overlying water, pore water, sediment, trace metals.


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