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Radiochimica Acta

International Journal for chemical aspects of nuclear science and technology

Editor-in-Chief: Qaim, Syed M.

12 Issues per year


IMPACT FACTOR 2017: 1.202

CiteScore 2017: 1.22

SCImago Journal Rank (SJR) 2017: 0.409
Source Normalized Impact per Paper (SNIP) 2017: 0.869

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2193-3405
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Volume 98, Issue 9-11

Issues

Mechanisms of plutonium sorption to mineral oxide surfaces: new insights with implications for colloid-enhanced migration

J. M. Schwantes / Peter H. Santschi
Published Online: 2010-11-23 | DOI: https://doi.org/10.1524/ract.2010.1775

Abstract

New equilibrium and kinetic models have been developed to describe rate-limited sorption and desorption of Pu onto and off of mineral oxide surfaces using a generic approach to estimate sorption constants that require minimal laboratory calibrations. Equilibrium reactions describing a total of six surface species were derived from a combination of empirical relationships previously described in the literature and generated as part of this work. These sorption reactions and corresponding equilibrium constants onto goethite (and silica) are:

≡SOH + Pu3+ ↔ ≡SOPu2+ + H+, logߙK = −2.1(−10)  (1)

≡SOH + Pu4+ ↔ ≡SOPu3+ + H+, logߙK = 15.3(7.2)  (2)

≡SOH + PuO2+ ↔ ≡SOPuO2 + H+, logߙK = −8.5(−16.5)  (3)

≡SOH + PuO22+ ↔ ≡SOPuO2+ + H+, logߙK = 1.2(−6.5)  (4)

≡SOH + Pu4+ + 3H2O ↔ ≡SOPu(OH)3 + 4H+, logߙK = 12.5(4.6)  (5)

≡SOH + Pu4+ + 4H2O ↔ ≡SOPu(OH)4 + 5H+, logߙK = 5.0(−2.3)  (6)

The kinetic model decouples reduced (III, IV) and oxidized (V, VI) forms of Pu via a single rate-limiting, but reversible, surface mediated reaction:...

Keywords: Plutonium; Sorption; Reactive transport; Colloid migration

About the article

* Correspondence address: Pacific Northwest National Laboratory, Advanced Radioanalytical Chemistry Group, Richland, WA 99352, U.S.A.


Published Online: 2010-11-23

Published in Print: 2010-11-01


Citation Information: Radiochimica Acta International journal for chemical aspects of nuclear science and technology, Volume 98, Issue 9-11, Pages 737–742, ISSN (Print) 0033-8230, DOI: https://doi.org/10.1524/ract.2010.1775.

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