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Radiochimica Acta

International Journal for chemical aspects of nuclear science and technology

Editor-in-Chief: Qaim, Syed M.


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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2193-3405
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Volume 98, Issue 9-11

Issues

Complexation of Nd(III) with tetraborate ion and its effect on actinide(III) solubility in WIPP brine

Marian Borkowski / Michael Richmann
  • 1 Los Alamos National Laboratory, Earth and Environmental Sciences Division, Carlsbad, NM 88220, U.S.A.
  • Other articles by this author:
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/ Donald T. Reed
  • 2 Los Alamos National Laboratory, Earth and Environmental Sciences Division, Carlsbad, U.S.A.
  • Other articles by this author:
  • De Gruyter OnlineGoogle Scholar
/ Yongliang Xiong
Published Online: 2010-11-23 | DOI: https://doi.org/10.1524/ract.2010.1756

Abstract

The potential importance of tetraborate complexation on lanthanide(III) and actinide(III) solubility is recognized in the literature but a systematic study of f-element complexation has not been performed. In neodymium solubility studies in WIPP brines, the carbonate complexation effect is not observed since tetraborate ions form a moderately strong complex with neodymium(III). The existence of these tetraborate complexes was established for low and high ionic strength solutions. Changes in neodymium(III) concentrations in undersaturation experiments were used to determine the neodymium with tetraborate stability constants as a function of NaCl ionic strength. As very low Nd(III) concentrations have to be measured, it was necessary to use an extraction pre-concentration step combined with ICP-MS analysis to extend the detection limit by a factor of 50.

The determined Nd(III) with borate stability constants at infinite dilution and 25 °C are equal to logβ1=4.55±0.06 using the SIT approach, equal to logβ1=4.99±0.30 using the Pitzer approach, with an apparent logβ1=4.06±0.15 (in molal units) at I=5.6 m NaCl. Pitzer ion-interaction parameters for neodymium with tetraborate and SIT interaction coefficients were also determined and reported.

Keywords: Borax; Borate complexation; Nd-tetraborate stability constant; Nd-borate Pitzer parameter; Neodymium-borate SIT coefficients

About the article

* Correspondence address: Los Alamos National Laboratory, Earth and Environmental Sciences Division, 115 Main Street, Carlsbad Operations, Carlsbad, NM 88220, 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 577–582, ISSN (Print) 0033-8230, DOI: https://doi.org/10.1524/ract.2010.1756.

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