Uranyl binding to humic acid under conditions relevant to cementitious geological disposal of radioactive wastes

A. Stockdale, N. D. Bryan

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    Abstract

    Few studies have sought to investigate the potential for dissolved organic matter (DOM) to bind (and thus potentially transport) radionuclides under the high pH regimes that are expected in cementitious disposal. We have used equilibrium dialysis to investigate uranyl binding to humic acid over a pH range of ∼10 to 13. The experimental results provide evidence that DOM can bind uranyl ions over this pH range, including in the presence of competing ions. There is a general decrease in binding with increasing pH, from ∼80% of total uranyl bound at pH 9.8 to ∼10% at pH 12.9. Modelling of the system with WHAM/Model VII can yield representative results up to pH ∼10.5. © 2012 The Mineralogical Society.
    Original languageEnglish
    Pages (from-to)3391-3399
    Number of pages8
    JournalMineralogical Magazine
    Volume76
    Issue number8
    DOIs
    Publication statusPublished - Dec 2012

    Keywords

    • Disposal
    • Humic acid
    • Organic matter
    • Radioactive waste
    • Uranium speciation
    • Uranyl ion

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