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Oversaturation experiments were performed to measure the Np(V) volubility in K-C1-C03 and Na-K-Cl-C03 solutions to high concentrations. The resulting solution compositions and stable Np(V) solid phases were compared with predictions from a proposed thermodynamic data base for Np(V) volubility in concentrated NaK-C1-C03 electrolyte solutions (Novak et al., 1996a). Measurements in 3.2m KC1 plus 0.001, 0.01, or O. lm K2C03 eliminated a parameter redundancy in the data base. The resulting data base predictions match thirteen volubility measurements to within 0.5 logarithmic units, where the measurements were taken over wide concentration ranges in K-C1-C03 media. In addition, results from six experiments in (5m NaCl + O.lm KC1) with added Na2C 03 concentrations below 0.05m are predicted within 0.5 logarithmic units, while those with added Na2C03 up to lm are predicted within 1.0 logarithmic unit. The thermodynamic data base also reproduces both the observed volubility-controlling solid phase and the total dissolved Np(V) concentrations in three complex synthetic brines with ionic strengths ranging from 0.8 to 7.8 molal. These comparisons demonstrate that solubility-limited aqueous Np(V) concentrations can be reliably predicted using the aqueous thermodynamics.

Solubility of Np(V) in K-CI-CO 3 and Na-K-Cl-CO 3 Solutions to High Concentrations: Measurements and Thermodynamic Model Predictions