Approaches to modelling uranium(VI) adsorption on natural mineral assemblages
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Date
2000-09-01
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Publisher
De Gruyter
Abstract
Component additivity (CA) and generalised composite (GC) approaches to deriving a suitable surface complexation model for description of U(VI) adsorption to natural mineral assemblages are pursued in this paper with good success. A single, ferrihydrite-like component is found to reasonably describe uranyl uptake to a number of kaolinitic iron-rich natural substrates at pH > 4 in the CA approach with previously published information on nature of surface complexes, acid-base properties of surface sites and electrostatic effects used in the model. The GC approach, in which little pre-knowledge about generic surface sites is assumed, gives even better fits and would appear to be a method of particular strength for application in areas such as performance assessment provided the model is developed in a careful, stepwise manner with simplicity and goodness of fit as the major criteria for acceptance. © 2015 Oldenbourg Wissenschaftsverlag GmbH.
Description
Physical copy held by ANSTO Library at DDC: 577.277/32
Keywords
Uranium, Adsorption, Minerals, Substrates, Kaolinite, Uranyl complexes, Ions, Quartz, Neptunium, Sorption, Surfaces
Citation
Waite, T. D., Davis, J. A., Fenton, B. R., & Payne, T. E. (2000). Approaches to modelling uranium(VI) adsorption on natural mineral assemblages. Paper presented to Chemistry and Migration Behaviour of Actinides and Fission Products in the Geosphere, proceedings of the seventh international conference Lake Tahoe (California), September 26 - October 01, 1999. In Radiochimica Acta, 88(9-11), 687–694. doi:10.1524/ract.2000.88.9-11.687