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Radiochimica Acta

International Journal for chemical aspects of nuclear science and technology

Editor-in-Chief: Qaim, Syed M.


IMPACT FACTOR 2018: 1.339

CiteScore 2018: 1.20

SCImago Journal Rank (SJR) 2018: 0.333
Source Normalized Impact per Paper (SNIP) 2018: 0.720

Online
ISSN
2193-3405
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Volume 101, Issue 11

Issues

Heterogeneous reduction of 239PuO2 by aqueous Fe(II) in the presence of hematite

A. R. Felmy / D. A. Moore / O. Qafoku / E. Buck / S. D. Conradson / E. S. Ilton
Published Online: 2013-10-14 | DOI: https://doi.org/10.1524/ract.2013.2091

Abstract

The reduction of PuO2(am) by Fe(II) in the presence and absence of hematite was studied over a range of pH values and oxidation/reduction potentials. In contrast to thermodynamic predictions, the presence of hematite did not have a major effect on the overall reduction of PuO2(am) to aqueous Pu(III). Instead the aqueous Pu(III) concentrations at longer time frames were accurately predicted using the measured Fe(II) concentration and existing thermodynamic data for the reaction: H2O + H++ Fe2++ PuO2(am) ⇌ Pu3++ Fe(OH)3(am) with log K =− 0.6. The accuracy of this approach in all solutions containing aqueous Fe(II), coupled with the apparent lack of oxidation of Fe(II) by O2(g), suggests that the Fe(OH)3(am) is formed by the oxidation of Fe(II) to Fe(III) by radiolysis. The continued generation of reactive amorphous iron hydroxide by radiolysis prevents thermodynamic equilibrium from being reached with more stable ferric oxide compounds, except possibly under acidic conditions where amorphous ferric hydroxide is soluble. The use of measured pe values, instead of aqueous Fe(II) measurements, also yields reasonable predictions of the final Pu(III) concentrations although the predictions are more uncertain.

: Plutonium dioxide; Hematite; Ferrous iron; Reduction; Radiolysis

About the article

Accepted: 2013-05-06

Received: 2012-09-05

Published Online: 2013-10-14

Published in Print: 2013-11-01


Citation Information: Radiochimica Acta, Volume 101, Issue 11, Pages 701–710, ISSN (Online) 2193-3405, ISSN (Print) 0033-8230, DOI: https://doi.org/10.1524/ract.2013.2091.

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© 2013 by Walter de Gruyter Berlin Boston.Get Permission

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