Complexation / Uranium / Isosaccharinic acid / Reducing conditions / Solubility product / Gluconic acid Summary. Conditional and pH independent stability constants have been determined for U(IV) α-isosaccharinic acid (ISA) and gluconic acid (Gl) complexes, under anaerobic and carbonate-free conditions, from pH 3 to 14. The constants are needed for nuclear waste repository performance assessment purposes. The constants were obtained by developing an approach based on the solubility product of amorphous UO 2 ·2H 2 O. The derived pH independent log β values for U(OH) 4 ISA and U(OH) 4 Gl were 49 ± 2 and 50 ± 1 respectively.
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