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Coprecipitation may be a significant process in controlling radionuclide release during spent fuel dissolution/reprecipitation in a breached geological disposal site by water. The objective of this work was to study the coprecipitation of thorium and lanthanum with UO 2+x (s) as host phase under reducing conditions (pure N 2  and  E  h =−300 mV/SHE) as a function of pH and [Th]/[U+Th] or [La]/[U+La] initial concentration ratios. At pH values between 3 to 9, the final concentrations of dissolved Th and La were found to be considerably lower than expected if pure phases, Th(OH) 4 (s) and La(OH) 3 (s) would have been formed. Coprecipitation phenomena and formation of solid solutions Th y U 1-y O 2+x′ (s) and (U,La)O 2+x′ (s) are suggested to be responsible for the lower solubility.

Coprecipitation of thorium and lanthanum with UO 2+x (s) as host phase