Advisor

Gabitov, Rinat I.

Committee Member

Migdisov, Artaches

Committee Member

Kirkland, Brenda L.

Date of Degree

5-1-2020

Original embargo terms

Complete embargo for 1 year||forever||10000-01-01

Document Type

Graduate Thesis - Open Access

Major

Geology Concentration in Geoscience

Degree Name

Master of Science

College

College of Arts and Sciences

Department

Department of Geosciences

Abstract

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.

URI

https://hdl.handle.net/11668/16936

Sponsorship

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).

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