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Radiochimica Acta

International Journal for chemical aspects of nuclear science and technology

Ed. by Qaim, Syed M.

IMPACT FACTOR increased in 2015: 1.100
5-year IMPACT FACTOR: 1.229
Rank 15 out of 32 in category Nuclear Science & Technology in the 2015 Thomson Reuters Journal Citation Report/Science Edition

SCImago Journal Rank (SJR) 2015: 0.470
Source Normalized Impact per Paper (SNIP) 2015: 0.708
Impact per Publication (IPP) 2015: 1.048

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Reduction of plutonium(VI) in brine under subsurface conditions

Donald T. Reed / J. F. Lucchini / S. B. Aase / A. J. Kropf

Citation Information: Radiochimica Acta. Volume 94, Issue 9-11, Pages 591–597, ISSN (Print) 0033-8230, DOI: 10.1524/ract.2006.94.9-11.591, September 2009

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The redox stability of PuO22+ was investigated in brine under subsurface conditions. In simulated brines, when no reducing agent was present, 0.1 mM concentrations of plutonium(VI) were stable as regards to reduction for over two years, which was the duration of the experiments performed. In these systems, the plutonyl existed as a carbonate or hydroxy-chloride species. The introduction of reducing agents (e.g. steel coupons, and aqueous Fe2+) typically present in a subsurface repository, however, led to the destabilization of the plutonium(VI) complexes and the subsequent reduction to Pu(IV) under most conditions investigated. X-ray Absorption Near-Edge Spectroscopy (XANES) confirmed that the final oxidation state in these systems was Pu(IV). This reduction lowered the overall steady state concentration of plutonium in the brine by 3−4 orders of magnitude. These results show the importance of considering repository constituents in evaluating subsurface actinide solubility/mobility and provide further evidence of the effectiveness of reduced iron species in the reduction and immobilization of higher-valent plutonium species.

Keywords: Plutonium; WIPP; XANES; Iron Reduction; Brine Chemistry

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