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Adsorption of Copper, Nickel, and Cadmium on Goethite in the Presence of Organic Ligands

Buerge-Weirich, Diane ; Behra, Philippe ; Sigg, Laura

In: Aquatic Geochemistry, 2003, vol. 9, no. 2, p. 65-85

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    Title
    • Adsorption of Copper, Nickel, and Cadmium on Goethite in the Presence of Organic Ligands
    Author
    • Buerge-Weirich, Diane. Swiss Federal Institute for Environmental Science and Technology (EAWAG), CH 8600, Duebendorf, Switzerland
    • Behra, Philippe. Institut de Mécanique des Fluides et des Solides, UMR 7507 Université Louis Pasteur-CNRS, 2, rue Boussingault, 67000, Strasbourg, France
    • Sigg, Laura. Swiss Federal Institute for Environmental Science and Technology (EAWAG), CH 8600, Duebendorf, Switzerland
    Document Type
    • Postprint
    OAI-PMH Identifier
    • oai:doc.rero.ch:313965
    Summary
    Adsorption of copper, cadmium and nickel at low concentrations on goethite was studied in the presence of the simple organic ligands oxalate, salicylate, and pyromellitate. The experimental metal adsorption behavior was compared to calculations with a surface complexation model to evaluate the most important interactions. Oxalate mostly decreased Cu and Ni adsorption at high pH-values by competition between solution and surface complexation but had no effect on Cd adsorption. Cu adsorption in the presence of oxalate below pH 6 could best be described by defining a ternary complex of type A (surface-metal-ligand). Salicylate had only minor effects on metal adsorption. The adsorption of Cu in the presence of salicylate above pH 5 could be explained by a ternary complex of type A. Pyromellitate increased the adsorption of Cu and Cd in the acidic pH-range, likely by formation of ternary surface complexes of type B (surface-ligand-metal)