Approaches to modelling uranium (VI) adsorption on natural mineral assemblages
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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.
| Publication type | Article |
|---|---|
| Publication Subtype | Journal Article |
| Title | Approaches to modelling uranium (VI) adsorption on natural mineral assemblages |
| Series title | Radiochimica Acta |
| DOI | 10.1524/ract.2000.88.9-11.687 |
| Volume | 88 |
| Year Published | 2000 |
| Language | English |
| Publisher | International Atomic Energy Agency |
| Contributing office(s) | Toxic Substances Hydrology Program |
| Description | 10 p. |
| First page | 687 |
| Last page | 696 |
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