Behavior of Cs in Grimsel granodiorite: sorption on main minerals and crushed rock
-
Muuri Eveliina
,
Ikonen Jussi
Abstract
In this study the sorption of cesium was investigated on four different minerals; quartz, plagioclase, potassium feldspar and biotite as well as granodiorite obtained from the Grimsel test site in Switzerland. The experiments were conducted in the presence of the weakly saline Grimsel groundwater simulant by determining the distribution coefficients using batch sorption experiments and PHREEQC-modelling across a large concentration range. In addition, the purity of the minerals was measured byXRDand the specific surface areas by BET method using krypton. The distribution coefficients of cesiumwere largest on biotite (0.304±0.005 m3/kg in 10-8 M). Furthermore, the sorption of cesiumon quartzwas found to be negligibly small in all investigated concentrations and the sorption of cesium on potassium feldspar and plagioclase showed similar behavior against a concentration isotherm with distribution coefficients of 0.0368±0.0004 m3/kg and 0.18±0.04 m3/kg in 10-8 M. Finally, cesium sorption behavior on crushed granodiorite followed the trend of one of its most abundant mineral, plagioclase with distribution coefficient values of 0.107±0.003 m3/kg in 10-8 M. At low concentrations (<1.0·10-6 M) cesiumwas sorbed on the frayed edge sites of biotite and once these sites are fully occupied cesium sorbs additionally to the Type II and Planar sites. As a consequence, the sorption of cesium on biotite is decreased at concentrations >1.0·10-6 M. Secondly cesium sorption on potassium feldspar and plagioclase showed similar non-linear behavior with varying concentration. The results were used to assist the interpretation of cesium diffusion process in the 2.5 year in-situ experiment carried out in the underground laboratory at Grimsel test site in Switzerland (2007–2009).
Acknowledgement
This work was supported by Finnish Research Program on Nuclear Waste Management KYT2014.
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©2016 Walter de Gruyter GmbH, Berlin/Boston
Articles in the same Issue
- Frontmatter
- Cross sections for d-3H neutron interactions with samarium isotopes
- Decomposition studies of group 6 hexacarbonyl complexes. Part 2: Modelling of the decomposition process
- Recovery of Ra-223 from natural thorium irradiated by protons
- Synthesis of ordered mesoporous uranium dioxide by a nanocasting route
- Complexation of Bi3+, Ac3+, Y3+, Lu3+, La3+ and Eu3+ with benzo-diaza-crown ether with carboxylic pendant arms
- Magnesium ionophore II as an extraction agent for trivalent europium and americium
- Behavior of Cs in Grimsel granodiorite: sorption on main minerals and crushed rock
- Issues concerning the determination of solubility products of sparingly soluble crystalline solids: solubility of HfO2(cr)
- Langmuir hydrogen dissociation approach in radiolabeling carbon nanotubes and graphene oxide
Articles in the same Issue
- Frontmatter
- Cross sections for d-3H neutron interactions with samarium isotopes
- Decomposition studies of group 6 hexacarbonyl complexes. Part 2: Modelling of the decomposition process
- Recovery of Ra-223 from natural thorium irradiated by protons
- Synthesis of ordered mesoporous uranium dioxide by a nanocasting route
- Complexation of Bi3+, Ac3+, Y3+, Lu3+, La3+ and Eu3+ with benzo-diaza-crown ether with carboxylic pendant arms
- Magnesium ionophore II as an extraction agent for trivalent europium and americium
- Behavior of Cs in Grimsel granodiorite: sorption on main minerals and crushed rock
- Issues concerning the determination of solubility products of sparingly soluble crystalline solids: solubility of HfO2(cr)
- Langmuir hydrogen dissociation approach in radiolabeling carbon nanotubes and graphene oxide
