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The solubility of thorium from Th 3 UO 8  and ZrTh 3 UO 10  ceramics was studied to evaluate the solubility constants for the materials. Zirconium was added in order to investigate potential additional stabilization of the thorium matrix from ZrO 2 . Studies were performed from pH 4 to pH 9 under both 100 Argon and 10 CO 2 /90 Ar at 25°C in 0.1M NaClO 4 . Reaction kinetics and equilibrium concentrations were evaluated for each condition. Rate constants increased with pH and varied from 6×10 -4  hr -1  to 4×10 -2  hr -1 . The surface area normalized dissolution rate decreased with increasing pH, the highest being 5×10 -7 gm -2  d -1  at pH 4. The solubility product constants calculated from the equilibrium concentrations for the two ceramics were equivalent, with  K  {spTh₃UO₈ }= -48.30.4 and  K  {spZrTh₃UO₈ = -47.90.9. The data was used to calculate the Th solution phase concentration. The result was compared to the dissolution of UO 2  from pH 5-9 in 0.1M NaClO 4  under a 1 CO 2  atmosphere at 25°C. It was found that the U from the UO 2  had a higher solution phase concentration than Th at high pH and was highly dependent upon the solution  E  h  of the evaluated conditions.

Solubility of thorium from Th 3 UO 8 and ZrTh 3 UO 10 ceramics