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

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 wat...

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Veröffentlicht in:Environmental chemistry letters 2012-11, Vol.9, p.485-494
Hauptverfasser: Lourino-Cabana, B., Lesven, L., Billon, G., Denis, Lionel, Ouddane, B., Boughrietd, A.
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container_issue
container_start_page 485
container_title Environmental chemistry letters
container_volume 9
creator Lourino-Cabana, B.
Lesven, L.
Billon, G.
Denis, Lionel
Ouddane, B.
Boughrietd, A.
description 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.
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Sciences of the Universe
title Benthic exchanges of sedimentary metals (Cd, Cu, Fe, Mn, Ni, Pb and Zn) in Deûle River (Northern France)
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