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Effects of pH and uranium valence state on the aqueous dissolution of brannerite

Conference Paper


Abstract


  • The dissolution of the thorium analogue of brannerite (ThTi 2O6-I) and U(IV)/U(V) doped Th-brannerite (Th 0.97U0.03Ti2O6-II and Th 0.955U0.03Ca0.015Ti2O 6-III) in aqueous media under atmospheric conditions has been studied to elucidate the effects of pH and uranium valence state on the dissolution rate. The dissolution of I is nearly stoichiometric but slightly preferential release of U occurs for II and preferential release of Ca and U occur for III. The V-shape pH dependence previously observed for U-brannerite only occurs for U (not other matrix elements) for II, indicating that the pH dependence is related to the U oxidation state upon dissolution. The normalised U dissolution rates of III are nearly an order of magnitude higher than those of II for pH values over 3, suggesting brannerite is less durable with U(V) doping. TEM examination of specimens after leaching revealed few surface alteration products, which is consistent with the nearly stoichiometric dissolution of thorium brannerite.

Publication Date


  • 2004

Citation


  • Zhang, Y., Loi, E., Blackford, M., McLeod, T., Li, H., & Begg, B. (2004). Effects of pH and uranium valence state on the aqueous dissolution of brannerite. In Materials Research Society Symposium Proceedings Vol. 807 (pp. 279-284).

Scopus Eid


  • 2-s2.0-12844251312

Web Of Science Accession Number


Start Page


  • 279

End Page


  • 284

Volume


  • 807

Abstract


  • The dissolution of the thorium analogue of brannerite (ThTi 2O6-I) and U(IV)/U(V) doped Th-brannerite (Th 0.97U0.03Ti2O6-II and Th 0.955U0.03Ca0.015Ti2O 6-III) in aqueous media under atmospheric conditions has been studied to elucidate the effects of pH and uranium valence state on the dissolution rate. The dissolution of I is nearly stoichiometric but slightly preferential release of U occurs for II and preferential release of Ca and U occur for III. The V-shape pH dependence previously observed for U-brannerite only occurs for U (not other matrix elements) for II, indicating that the pH dependence is related to the U oxidation state upon dissolution. The normalised U dissolution rates of III are nearly an order of magnitude higher than those of II for pH values over 3, suggesting brannerite is less durable with U(V) doping. TEM examination of specimens after leaching revealed few surface alteration products, which is consistent with the nearly stoichiometric dissolution of thorium brannerite.

Publication Date


  • 2004

Citation


  • Zhang, Y., Loi, E., Blackford, M., McLeod, T., Li, H., & Begg, B. (2004). Effects of pH and uranium valence state on the aqueous dissolution of brannerite. In Materials Research Society Symposium Proceedings Vol. 807 (pp. 279-284).

Scopus Eid


  • 2-s2.0-12844251312

Web Of Science Accession Number


Start Page


  • 279

End Page


  • 284

Volume


  • 807