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Heterogeneous isotope exchange rates of Na + , Ca + , Ba 2+  and Sr 2+  in mono-and biionic resin exchangers (Merck I) have been measured under conditions where diffusion is rate determining. For the self-diffusion of Na + , Ba 2+  and Sr 2+  linear Dt/r 2  - f(t)-curves are obtained. Cs-isotope exchange shows non-ideal diffusion kinetics. In mixed Ba-exchangers the self-diffusion coefficients of Ba 2+  and Sr 2  depend on the ionic composition of the exchanger phase. Ion exchange rates have been measured for Ba/Sr 2+  -exchange and its reversal. Computed curves are presented using Helfferich’s theory of ion exchange and an extended treatment with activity correction terms and concentration dependent self-diffusion coefficients. Computed and experimental curves are discussed.

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Zur Diffusionskinetik in Ionenaustauscherharzen Selbst-und Austauschdiffusion von Alkali-und Erdalkaliionen / The Diffusion Kinetic in Ionic Resin Exchangers. Self- and Exchange-Diffusion of Alcaliions