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- W309276111 abstract "Compacted bentonite is a major packing and storage material, because of its extremely low hydraulic conductivity. This chapter presents an additive mixed-component model to describe the surface complexation of radionuclides in the bentonite MX-80. The chapter provides an overview of the mineralogy and the surface sites. The surface chemistry of selected components of the bentonite is discussed. The additive model is applied to study the sorption of U(VI). Upon radiolysis of (vitrified) waste material, U(VI) is assumed to be the main dissolution product together with aqueous silica. The chapter includes a table that presents an overview of the mineralogy of the bentonite MX-80. The exact distribution of SiO2 over quartz and cristobalite in MX-80 has been characterized recently using Fourier transform infrared spectroscopy, and a 50–50% distribution was found. Within the additive model for bentonite, the surface complexation models as presented were used for the pure mineral systems as fixed input. The site density of montmorillonite and the accessory phases in the bentonite was also a fixed input into the additive model. The acid-base chemistry of montmorillonite has been successfully described by a relatively simple surface complexation model. The aim of an additive surface model is, ideally, the possibility to predict sorption of, in this case, uranyl based on the following: (1) individual components of the complex material, (2) surface site densities, that are related to the grain size of the minerals, and (3) additivity of the surface complexation models for the sorption of uranyl in pure systems of minerals present in the solid." @default.
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- W309276111 date "2006-01-01" @default.
- W309276111 modified "2023-09-27" @default.
- W309276111 title "Surface chemistry of bentonite: an additive model applied to uranyl sorption" @default.
- W309276111 hasPublicationYear "2006" @default.
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