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Publication Detail
An experimental study of the dissolution rates of Nd-britholite, an apatite-structured actinide-bearing waste storage host analogue
  • Publication Type:
    Journal article
  • Publication Sub Type:
    Journal Article
  • Authors:
    Chaïrat C, Oelkers EH, Schott J, Lartigue JE
  • Publication date:
  • Pagination:
    14, 27
  • Journal:
    Journal of Nuclear Materials
  • Volume:
  • Issue:
  • Status:
  • Print ISSN:
The steady-state dissolution rates of Nd-britholite Ca9Nd(PO4)5SiO4F2 have been measured at 25 °C as a function of aqueous solution composition in open-system mixed flow reactors. Measured Nd-britholite dissolution rates based on Ca, P, and F release are found to be close to corresponding apatite dissolution rates; these 25 °C rates decrease from 10-8 to 10-12 mol/m2/s with increasing pH from 3 to 12. Measured Nd release rates are far slower than those of these other elements; Nd concentrations in solution appear to limited by precipitation of a secondary phosphate phase, which limits aqueous Nd concentrations to <10-12 mol/kg at near neutral conditions. Correspondingly, it appears likely that aqueous actinide release from analogous waste hosts will be similarly limited by the precipitation of sparingly soluble phases. © 2006 Elsevier B.V. All rights reserved.
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