Thermodynamic interpretation of uranium(IV/VI) solubility in the presence of α-isosaccharinic acid

Add time:09/01/2019    Source:sciencedirect.com

The effect of α-isosaccharinic acid (ISA) on the solubility and redox of tetravalent and hexavalent uranium (U(IV), U(VI)) was investigated in the hydrogen ion concentration (pHc = −log [H+]) range of 6–13 and at total ISA concentration ([ISA]tot) = 10−4–10−1.2 mol/dm3 (M). The dependence of U(IV) solubility on pHc and [ISA]tot suggested the existence of U(OH)4(ISA)22− as a dominant species within the investigated pHc range of 6–12. For the U(VI)-ISA system, UO2(OH)3(ISA)23− was suggested as a dominant species at pHc 7–13. The formation constants of the U(IV)-ISA and U(VI)-ISA complexes were determined by least squares fitting of the solubility data. The solubility of U(IV) and U(VI) in the presence of ISA and its effect on the redox behavior were thermodynamically interpreted based on the obtained constants.

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