Gabitov, Rinat I.
Kirkland, Brenda L.
Date of Degree
Original embargo terms
Complete embargo for 1 year||forever||10000-01-01
Graduate Thesis - Open Access
Geology Concentration in Geoscience
Master of Science
College of Arts and Sciences
Department of Geosciences
The traditional paradigm declares tetravalent uranium to be immobile under reducing conditions – an assumption widely employed for nuclear waste management strategies. In contrast, experiments presented here demonstrate this assumption, although valid for low temperatures, can be erroneous for high temperature natural systems. This project focuses on the ability of sulfate-bearing solutions to transport uranium at reduced conditions and elevated temperatures, identifies the new species U(OH)2SO4, derives thermodynamic constants necessary for modeling, and expands the quantifiable range of U4+ mobility to more neutral pH conditions. The data obtained enable more accurate assessment of uranium mobility by updating the existing uranium thermodynamic databases and is applicable to uranium fluid transport in oreorming systems and nuclear waste repositories.
Research presented in this thesis was supported by the Laboratory Directed Research and Development program of Los Alamos National Laboratory under project numbers 20180007DR, 20180094DR and by the CSES Emerging Ideas R&D grants (LANL) to A.M (20180475DR).
van Hartesveldt, Noah, "Uranium solubility in high temperature, reduced systems" (2020). Theses and Dissertations MSU. 4856.