Approaches to modelling uranium (VI) adsorption on natural mineral assemblages

Radiochimica Acta
By: , and 

Links

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.

Additional publication details

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