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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

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Volume 94, Issue 9-11


Reduction behavior of uranium in the presence of citric acid

Yoshinori Suzuki / T. Nankawa / T. Yoshida / Takuo Ozaki / T. Ohnuki / Arokiasamy J. Francis / S. Tsushima / Y. Enokida / I. Yamamoto
Published Online: 2009-09-25 | DOI: https://doi.org/10.1524/ract.2006.94.9-11.579

We examined the reduction behavior of UO22+ in citrate media at pH 2.0−7.0 by column electrodes. At pH 2.0, UO22+ was reduced to U(IV) through a one-step reduction process, while it was reduced to U(IV) through a two-step reduction process at pH 3.0−5.0. The reduction potential of UO22+ shifted to lower values with an increase in pH from 2.0 to 7.0. At pH 6.0 and 7.0, UO22+ was not reduced to U(IV) completely at the electrode potential above -0.8 V vs . silver/silver chloride electrode. Ultraviolet-visible spectroscopy and speciation calculation of UO22+ in citrate media indicated that uranium existed as a mixture of UO22+, [UO2Cit]- and [(UO2)2Cit2]2- at pH 2−3, and a predominant species at pH 3−5 was [(UO2)2Cit2]2- (H3Cit: citric acid). At pH 5−7, polymeric complexes, probably, [(UO2)3Cit3]3- and [(UO2)6Cit6(OH)10]16- were present. These findings suggest that the reduction of UO22+ is more difficult by polymerization of UO22+ with citric acid at higher pHs. Absorption spectra of the reduced complexes showed that U(IV) forms soluble complexes with citric acid at pH 2.0−5.0, and presence of U(V) species was not observed during the reduction of UO22+.

Keywords: Uranium-citrate complex; Reduction; Speciation; Column electrode; Absorption spectrum

About the article

Received: 2005-09-23

Accepted: 2006-03-26

Published Online: 2009-09-25

Published in Print: 2006-11-01

Citation Information: Radiochimica Acta, Volume 94, Issue 9-11, Pages 579–583, ISSN (Online) 2193-3405, ISSN (Print) 0033-8230, DOI: https://doi.org/10.1524/ract.2006.94.9-11.579.

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