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ISSN : 1738-1894(Print)
ISSN : 2288-5471(Online)
ISSN : 2288-5471(Online)
Journal of Nuclear Fuel Cycle and Waste Technology Vol. No. pp.5-5
DOI : https://doi.org/10.7733/jnfcwt.2024.028
DOI : https://doi.org/10.7733/jnfcwt.2024.028
Sorption of Tc(IV) in Saline Solutions – I. Sorption on MX-80 and Granite in Ca-Na-Cl Solutions
2024-04-26 ;
2024-05-20 ;
2024-06-13
Abstract
Technetium-99 is identified as an element of interest for the safety assessment of a deep geological repository for used nuclear fuel. The sorption behavior of Tc(IV) onto MX-80 and granite in Ca-Na-Cl solutions of varying ionic strength (0.05 – 1 mol/kgw (m)) and across a pHm range of 4 – 9 was studied in this paper. Sorption of Tc(IV) was found to be independent of ionic strength in the range of 0.05 to 1 m for both MX-80 and granite. Sorption of Tc(IV) on MX-80 increased with pHm from 4 to 7 and then decreased with pHm from 8 to 9. Sorption of Tc(IV) on granite gradually increased with pHm from 4 to 8 and then became almost constant or slightly decreased with pHm from 8 to 9. A 2 site protolysis non-electrostatic surface complexation and cation exchange sorption model successfully simulated sorption of Tc(IV) on MX-80 and granite. Optimized values of surface complexation constants (log K0) are proposed
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