Abstract
A study by an inverse break-through process consisting in the elution with a ferric nitrate solution at several concentrations of a strong cationic resin in U(IV)-form has been carried out. For Fe(No3)3, 0.1 M an apparent equilibrium constant of 1.00217 has been obtained at the room temperature, which indicates an acceleration in the presence of the nitrate anion of the isotopic exchange reaction between U(IV) in resin form and U)IV) in solution. This exchange reaction allows to increase the 235 concentration in the liquid phase. The acceleration action of was explained by considering both the oxidising and the low complexing properties of the nitrate anion.
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