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Title: Investigation of the interactions of uranium and plutonium with Boom clay organic matter
Author: Walker, Gareth
Awarding Body: Loughborough University
Current Institution: Loughborough University
Date of Award: 2005
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The solubility of uranium (IV) oxide, UO2, was investigated. Uranium (VI) was reduced to uranium (IV) using sodium dithionite and iron granules at high pH (NaOH). A solubility enhancement of UO2 in the presence of Boom clay humic acid (BCHA) was found to be approximately one order of magnitude, where the solubility of UO2 (10-9 to 10-8 mol dm-3) was increased to 10-7 mol dm-3 by BCHA. The solubility product (Ksp) of aqueous U(OH)4 and stability constant (β141) for BCHA-U(OH)4 were calculated from experimental data using a novel approach utilising the side reaction coefficient theory ('A' term). A log Ksp value of -54.51 for U(OH)4, and a log β141 value of 51.36 for BCHA-U(OH)4 were calculated.
Supervisor: Not available Sponsor: European Union
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available
Keywords: Chemical Sciences not elsewhere classified