 |
GET - Geosciences -Environnement- Toulouse |  |
|
GET - Geosciences -Environnement- Toulouse | |
| HAL : hal-00316707, version 1 |
| DOI : 10.1016/J.JNUCMAT.2006.01.022 |
| Fiche détaillée |  Récupérer au format |
 |
| Journal of Nuclear Materials 354 (2006) 14-27 |
|
|
|
|
| An experimental study of the dissolution rates of Nd-britholite, an apatite-structured actinide-bearing waste storage host analogue |
|
|
| Claire Chaïrat 1Eric H. Oelkers 1 |
|
|
| (08/2006) |
|
|
|
| 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. |
|
|
|
|
|
|
|
|
|
|
|
| 1 : | Laboratoire des Mécanismes et Transfert en Géologie (LMTG) |
|
|
|
CNRS : UMR5563 – Observatoire Midi-Pyrénées – Université Paul Sabatier [UPS] - Toulouse III – Institut de recherche pour le développement [IRD] : UMR154 |
|
|
|
|
|
|
|
|
|
| Domaine | : | Planète et Univers/Sciences de la Terre |
| hal-00316707, version 1 | |
| http://hal.archives-ouvertes.fr/hal-00316707 | |
| oai:hal.archives-ouvertes.fr:hal-00316707 | |
| Contributeur : Andy Senegas | |
| Soumis le : Mercredi 3 Septembre 2008, 11:36:13 | |
| Dernière modification le : Mercredi 3 Septembre 2008, 11:36:13 | |
