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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 104, Issue 1

Issues

Distribution coefficients for the sorption of Th, U, Np, Pu, and Am on Opalinus Clay

Samer Amayri / Daniel R. Fröhlich
  • Institute of Nuclear Chemistry, Johannes Gutenberg University Mainz, 55099 Mainz, Germany
  • Present address: Institute of Physical Chemistry, Heidelberg University, 69117 Heidelberg, Germany
  • Other articles by this author:
  • De Gruyter OnlineGoogle Scholar
/ Ugras Kaplan
  • Institute of Nuclear Chemistry, Johannes Gutenberg University Mainz, 55099 Mainz, Germany
  • Present address: Institute for Nuclear Waste Disposal, Karlsruhe Institute of Technology, 76021 Karlsruhe, Germany
  • Other articles by this author:
  • De Gruyter OnlineGoogle Scholar
/ Norbert Trautmann / Tobias Reich
Published Online: 2015-11-26 | DOI: https://doi.org/10.1515/ract-2015-2409

Abstract

The distribution coefficients (Kd) are determined for the sorption of Th(IV), U(VI), Np(V), Pu(III/IV/VI), and Am(III) in the system natural Opalinus Clay (OPA) from Mont Terri, Switzerland, and synthetic OPA pore water at pH7.6 as a function of solid-to-liquid ratio and element concentration. A linear sorption behavior under the chosen experimental conditions was obtained. The Kd values strongly depend on the oxidation state of the actinide. The Kd values for the tri- and tetravalent actinides are in the range of 29–159 m3/kg. U and Np in the oxidation states six and five, respectively, are weakly sorbed on OPA with Kd values of 0.04–0.05 m3/kg. The Kd values for the redox-stable Am(III) and Th(IV) are in the same range as for Pu(III) and Pu(IV) which are redox sensitive. The Kd value of Pu(VI) (13 ± 3 m3/kg) is about one order of magnitude lower than the Kd values of Pu(III) and Pu(IV), but still more than two orders of magnitude higher compared to the values obtained for U(VI) and Np(V). This discrepancy is attributed to the partial reduction of Pu(VI) to Pu(IV) during sorption.

Keywords: Sorption; actinides; Opalinus Clay; distribution coefficients

Acknowledgement

The authors would like to thank Dr. Christian Marquardt, Institute for Nuclear Waste Disposal, Karlsruhe Institute of Technology, for providing OPA. This work was financially supported by the Federal Ministry for Economic Affairs and Energy under contract No. 02E10166 and No. 02E10981.

About the article

Accepted: 2015-09-01

Received: 2015-03-02

Published Online: 2015-11-26

Published in Print: 2016-01-28


Citation Information: Radiochimica Acta, Volume 104, Issue 1, Pages 33–40, ISSN (Online) 2193-3405, ISSN (Print) 0033-8230, DOI: https://doi.org/10.1515/ract-2015-2409.

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