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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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Volume 98, Issue 9-11


Molecular interactions of plutonium(VI) with synthetic manganese-substituted goethite

Yung-Jin Hu / Luna Kestrel Schwaiger / Corwin H. Booth
  • 3 Lawrence Berkeley National Laboratory, Chemical Sciences Division, Berkeley, CA 94720, U.S.A.
  • Other articles by this author:
  • De Gruyter OnlineGoogle Scholar
/ Ravi K. Kukkadapu / Elena Cristiano
  • 5 Lawrence Berkeley National Laboratory, Nuclear Sciences Division, Berkeley, CA 94720, U.S.A.
  • Other articles by this author:
  • De Gruyter OnlineGoogle Scholar
/ Daniel Kaplan / Heino Nitsche
Published Online: 2010-11-23 | DOI: https://doi.org/10.1524/ract.2010.1766


Plutonium(VI) sorption on the surface of well-characterized synthetic manganese-substituted goethite minerals (Fe1−xMnxOOH) was studied using X-ray absorption spectroscopy. We chose to study the influence of manganese as a minor component in goethite because goethite rarely exists as a pure phase in nature. Manganese X-ray absorption near-edge structure measurements indicated that essentially all the Mn in the goethite existed as Mn(III), even though Mn was added during mineral synthesis as Mn(II). Importantly, energy dispersive X-ray analysis demonstrated that Mn did not exist as discrete phases and that it was homogeneously mixed into the goethite to within the limit of detection of the method. Furthermore, Mössbauer spectra demonstrated that all Fe existed as Fe(III), with no Fe(II) present. Plutonium(VI) sorption experiments were conducted open to air and no attempt was made to exclude carbonate. The use of X-ray absorption spectroscopy allows us to directly and unambiguously measure the oxidation state of plutonium in situ at the mineral surface. Plutonium X-ray absorption near-edge structure measurements carried out on these samples showed that Pu(VI) was reduced to Pu(IV) upon contact with the mineral. This reduction appears to be strongly correlated with mineral solution pH, coinciding with pH transitions across the point of zero charge of the mineral. Furthermore, extended X-ray absorption fine structure measurements show evidence of direct plutonium binding to the metal surface as an inner-sphere complex. This combination of extensive mineral characterization and advanced spectroscopy suggests that sorption of the plutonium onto the surface of the mineral was followed by reduction of the plutonium at the surface of the mineral to form an inner-sphere complex. Because manganese is often found in the environment as a minor component associated with major mineral components, such as goethite, understanding the molecular-level interactions of plutonium with such substituted mineral phases is important for risk assessment purposes at radioactively contaminated sites and long-term underground radioactive waste repositories.

Keywords: Plutonium; XAS; Redox; Sorption; Manganese-substituted goethite

About the article

* Correspondence address: University of California at Berkeley, Departement of Chemistry, 1 Cyclotron Road, MS70A-1150, CA 94720 Berkeley, 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 655–663, ISSN (Print) 0033-8230, DOI: https://doi.org/10.1524/ract.2010.1766.

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