Abstract
Chromatography experiments using a tertiary pyridine resin have been carried out in methanolic nitric acid solution for the separation of trivalent actinides (An) and lanthanides (Ln). The elution behavior of trivalent An (Am and Cm) is similar to that of middle Ln series in the nitric acid system, while the trivalent An are separated from Ln in methanolic hydrochloric acid solution. The calculated distribution coefficients ( K d ) indicate that the adsorbability of trivalent An and Ln depends on their ionic radii in the nitric acid system. The different separation behavior observed between nitric acid and hydrochloric acid systems is discussed from the viewpoint of solvation structures.
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