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Ion Mobilities of Trivalent f-Elements in Aqueous Electrolytes

Summary Individual ion mobilities «Se^t of carrier-free La(III), Eu(III), Gd(III), Tb(III), Tm(III), Yb(III), Lu(III), Ain(III) and Cf(III) were measured in dependence on the pH of aqueous Perchlorate electrolytes at /i = 0.10, 7=298.1 K. Two different levels of ion mobilities were found in neutral (pH > 5) and acidic (pH < 2.5) solutions for most of the cations investigated. Exceptions are Eu(III) and Cf(III). The observed relationships between the crystallographic radii of the trivalent /-elements and their UMCI* data in acidic and neutral electrolytes confirm the hypothesis of S-shaped changes of hydratation parameters within the lanthanide and actinide series.