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Radiochimica Acta

International Journal for chemical aspects of nuclear science and technology

Ed. by Qaim, Syed M.

12 Issues per year


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
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Impact per Publication (IPP) 2015: 1.048

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ISSN
2193-3405
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Sorption of Cm(III) onto different Feldspar surfaces: a TRLFS study

Silvia Stumpf / Th. Stumpf / C. Walther / Dirk Bosbach / Thomas Fanghänel
Published Online: 2009-09-25 | DOI: https://doi.org/10.1524/ract.2006.94.5.243

Summary

The pH dependent sorption of Cm(III) onto alkali Feldspars (albite and orthoclase) is investigated by time resolved laser fluorescence spectroscopy (TRLFS) in the pH range from 3.4 to 9.4. Three single components are calculated from the raw spectra for both feldspar systems. The first component which corresponds to the Cm(III) aquo ion has a peak maximum at 593.8 nm and a fluorescence emission lifetime of 68±4 μs. This lifetime corresponds to a Cm(III) coordination of nine water molecules in the first coordination sphere of the actinide ion. The second component with a peak maximum at 601.4 nm corresponds to an adsorbed species. Its lifetime of 107±3 μs indicates a reduction of coordinating H2O/OH ligands from nine to five caused by inner-sphere complex formation. The third component (603.6 nm) can be attributed to another sorption species. The corresponding lifetime is again 107±3 μs. Hence the number of coordinating ligands remains constant while the ligand field changes caused by the hydrolysis of the sorbed Cm(III).

In a further set of experiments the Cm(III) sorption onto albite which is altered at pH 6.0 and pH 9.0 is also investigated by TRLFS. Independent of the dissolution and different surface morphologies caused by the alteration process the same Cm(III) species are formed as found for the sorption onto the untreated albite surface. With regard to the clarification of a feldspar dissolution mechanism the TRLFS results of the Cm(III) sorption onto altered feldspar surfaces give no evidence for a dissolution-reprecipitation based alteration mechanism.

Keywords: Curium; Feldspars; Alteration; Surface complexation; Sorption; TRLFS


Published Online: 2009-09-25

Published in Print: 2006-05-01


Citation Information: Radiochimica Acta. Volume 94, Issue 5, Pages 243–248, ISSN (Online) 2193-3405, ISSN (Print) 0033-8230, DOI: https://doi.org/10.1524/ract.2006.94.5.243, September 2009

Citing Articles

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[1]
Horst Geckeis, Johannes Lützenkirchen, Robert Polly, Thomas Rabung, and Moritz Schmidt
Chemical Reviews, 2013, Volume 113, Number 2, Page 1016
[2]
Gopala Krishna Darbha, Cornelius Fischer, Johannes Luetzenkirchen, and Thorsten Schäfer
Environmental Science & Technology, 2012, Volume 46, Number 17, Page 9378
[3]
S. Stumpf, Th. Stumpf, J. Lützenkirchen, C. Walther, and Th. Fanghänel
Journal of Colloid and Interface Science, 2008, Volume 318, Number 1, Page 5
[4]
Eva Hartmann, Boris Brendebach, Robert Polly, Horst Geckeis, and Thorsten Stumpf
Journal of Colloid and Interface Science, 2011, Volume 353, Number 2, Page 562
[5]
M. Marques Fernandes, T. Stumpf, T. Rabung, D. Bosbach, and Th. Fanghänel
Geochimica et Cosmochimica Acta, 2008, Volume 72, Number 2, Page 464
[6]
Kiel Holliday, Aurélie Chagneau, Moritz Schmidt, Francis Claret, Thorsten Schäfer, and Thorsten Stumpf
Dalton Transactions, 2012, Volume 41, Number 13, Page 3642
[7]
Michael Steppert, Ivana Císařová, Thomas Fanghänel, Andreas Geist, Patric Lindqvist-Reis, Petra Panak, Petr Štěpnička, Sascha Trumm, and Clemens Walther
Inorganic Chemistry, 2012, Volume 51, Number 1, Page 591
[8]
A. Filby, M. Plaschke, H. Geckeis, and Th. Fanghänel
Journal of Contaminant Hydrology, 2008, Volume 102, Number 3-4, Page 273
[9]
Moritz Schmidt, Thorsten Stumpf, Clemens Walther, Horst Geckeis, and Thomas Fanghänel
Dalton Transactions, 2009, Number 33, Page 6645
[10]
María Castro-Puyana, Antonio Salgado, Robert M. Hazen, Antonio L. Crego, and María Luisa Marina Alegre
ELECTROPHORESIS, 2008, Volume 29, Number 7, Page 1548
[11]
Silvia Stumpf, Isabelle Billard, Petra J. Panak, and Soufiane Mekki
Dalton Trans., 2007, Number 2, Page 240

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