Speciation (including adsorbed species) of copper, lead, nickel and zinc in the Meuse River: Observed results compared to values calculated with a chemical equilibrium computer program |
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| Authors: | Christophe Mouvet Alain CM Bourg |
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| Affiliation: | 1. Department of Botany, University of Liege, B-4000 Sart-Tilman, Belgium;2. Institute of Inorganic Chemistry, University of Bern, Freiestrasse 3, CH-3000 Bern 9, Switzerland |
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| Abstract: | The adsorption of trace metals on sediments of the Meuse River was interpreted in terms of competition between metals and protons for surface sites. Surface constants (*β1surf) were determined for Cu, Zn and Cd (10−1.8, 10−3.6 and 10−3.7). The constants for Pb, Ni, Ca and Mg (10−1.7, 10−3.8, 10−6.5 and 10−5.2) were estimated using a correlation between hydrolysis and surface constants. A chemical equilibrium computer program in which surface sites (for adsorption reactions) are treated as conventional ligands was used to calculate the speciation of Cu, Pb, Ni and Zn in the Meuse River. Calculated values of the adsorbed/dissolved distribution agreed well with observed values, after some realistic data manipulation. This work indicates that dissolved trace metal concentrations in the Meuse River are controlled by adsorption and not by precipitation mechanisms. The relationship between organic matter and suspended matter greatly influences the adsorption of metals like Cu and Pb. |
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| Keywords: | Present address and to whom correspondence should be addressed: Department M G A Geochemistry Section Bureau de Recherches Géologiques et Minières BP 6009 F-45060 Orleans Cedex France |
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