Dependence of chlorine isotope separation in ion exchange chromatography on the nature and concentration of the eluent

In a heterogeneous electrolyte system of a strongly basic anion exchanger and solutions of NaBF4 or NaClO4 we established the influence of the nature and concentration of the eluent in chromatographic experiments on chlorine isotope separation. Results show that when the elctrolyte concentration is increased the degree of isotope separation decreases. With NaBF4 the separation factor is greater than with NaClO4 under conditions which are otherwise the same. For electrolyte solutions containing ClO4-, NO3- and BF4- there is a linear relation between the separation factor of the chlorine isotopes and the logarithm of the heat of anion hydration of the elution electrolyte. (orig.)