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Determination of high resolution pore water profiles of trace metals in sediments of the Rupel River (Belgium) using DET (Diffusive Equilibrium in Thin Films) and DGT (Diffusive Gradients in Thin Films) techniques
Leermakers, M.; Gao, Y.; Gabelle, C.; Lojen, S.; Ouddane, B.; Wartel, M.; Baeyens, W.F.J. (2005). Determination of high resolution pore water profiles of trace metals in sediments of the Rupel River (Belgium) using DET (Diffusive Equilibrium in Thin Films) and DGT (Diffusive Gradients in Thin Films) techniques. Water Air Soil Pollut. 166(1-4): 265-286
In: Water, Air, and Soil Pollution. Springer: Dordrecht. ISSN 0049-6979; e-ISSN 1573-2932, more
Peer reviewed article  

Available in  Authors | Dataset 
    VLIZ: Open Repository 103744 [ OMA ]

Keywords
    Chemical speciation
    Sediments
    Trace elements > Trace metals
    Water > Pore water
    Belgium, Rupel R. [Marine Regions]

Authors  Top | Dataset 

Abstract
    The techniques of diffusional equilibrium in thin films (DET) and diffusional gradients in thin films (DGT) were used to obtain high resolution pore water profiles of total dissolved and labile trace (mobilizable) metals in the sediments of the Rupel River, Belgium. DGT measures labile metal species in situ by immobilizing them on a resin gel after diffusion through a diffusive gel whereas for DET an equilibrium is established between the DET gel and the pore water. Concentrations of Pb and Zn obtained by DGT were in good agreement with the results obtained by centrifugation, and thus were well buffered by rapid equilibrium with the solid phase, whereas Fe, Mn and Cd were very tightly bound to the sediment phase and large differences were observed between the labile and the total metal concentrations. Cu, Zn, Co and Ni show intermediated behavior.Good correlations were found between the profiles of As and Fe and Mn and Co for DET as well as DGT showing a close link between the geochemical behavior of these elements. Cu, Zn, Pb and Cd are also influenced by the reductive mobilization of Fe and Mn oxides but are also closely linked to the bacterial degradation of organic matter in the surface sediments as to the precipitation of metal sulfides in the deeper layers.

Dataset
  • STARDUST Rupel test site, more

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