Uranium VI adsorption on model minerals: controlling factors and surface complexation modelling
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Date
1996-03-24
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Publisher
American Chemical Society
Abstract
We have been studying U(VI) sorption on model minerals including ferrihydrite and kaolinite, to assist in modelling U migration at a field site in Northern Australia. Factors that have been shown to have an influence within the normal ranges encountered in the environment include: pH, ionic strength, partial pressure of CO2, adsorbent loading, total amount of U present, and the presence of ligands such as phosphate and humic acid. The effect of these ligands may be to enhance or reduce U uptake. The adsorption model being used for ferrihydrite is a surface complexation model with a diffuse double layer and both strong and weak sites for U sorption. Trace impurity phases and mineral coatings can play a dominant role in determining U sorption in both environmental and model systems.
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Keywords
Uranium, Sorption, Australia, Ligands, Minerals, Simulation, Kaolinite
Citation
Payne, T. E., Lumpkin, G. R., and Waite, T D. (1996). Uranium VI adsorption on model minerals: controlling factors and surface complexation modelling. Paper presented at the Spring National Meeting of the American Chemical Society (ACS), New Orleans, Louisiana, USA, 24-28 March 1996.