Title: Interaction of Latex Colloids with Mineral Surfaces and Grimsel Granodiorite
Citation: JOURNAL OF CONTAMINANT HYDROLOGY vol. 102 p. 273-284
Publication Year: 2008
JRC N°: JRC50706
ISSN: 0169-7722
URI: http://publications.jrc.ec.europa.eu/repository/handle/JRC50706
DOI: 10.1016/j.jconhyd.2008.09.016
Type: Articles in periodicals and books
Abstract: Bentonite clay is considered as possible backfill material for nuclear waste repositories in crystalline rock. The same material may also be a source of clay colloids, which may act as carriers for actinide ions possibly released from the repository. Depending on the geochemical parameters, these colloids may be retained by interaction with mineral surfaces of the host rock. In the present study interaction of carboxylated fluorescent latex colloids, used as a model for bentonite colloids, with natural Grimsel granodiorite and some of its component minerals is studied by fluorescence microscopy and SEM/EDX. The experiments are carried out by varying the pH from 2¿10. Strong adsorption is observed at pH values close to or below the points of zero charge (pHpzc) of the mineral surfaces. The influence of Eu(III), used as a chemical homologue for trivalent actinide ions, on colloid adsorption is investigated. Depending on mineral phase and pH, a significant increase of colloid adsorption is observed in the presence of Eu(III).
JRC Directorate:Nuclear Safety and Security

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