Abstract
The diffusion coefficients of Am in lanthanum and barium nitrate solutions of various concentrations in the pH range 2–12 at 25°C were determined. The secondary hydrate shell of the ion does not participate in the Am migration in the solution. The Am hydrolysis is stepwise and occurs via intermediate species according to the scheme Am(H2O)93+ → Am(OH)(H2O)92+ or Am(OH)(H2O)82+ → Am(OH)2(H2O)5+ → Am(OH)3. The diffusion coefficients of Am at infinite dilution were determined: D0 = 6.2 × 10−6 cm2 s−1 at pH 2 and D0 = 6.15 × 10−6 cm2 s−1 at pH 3. The limiting concentrations at which the Onsager law is still observed are 0.1 g-equiv l−1 at pH 3 and 0.3 g-equiv l−1 at pH 2.
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