Dependence of Chlorine Isotope Separation in Ion Exchange Chromatography on the Nature and Concentration of the Eluent

Abstract

<jats:p>In a heterogeneous electrolyte system of a strongly basic anion exchanger and solutions of NaBF<jats:sub>4</jats:sub> or NaClCO<jats:sub>4</jats:sub> we established the influence of the nature and concentration of the eluent in chromatographic experiments on chlorine isotope separation. Results show that when the electrolyte concentration is increased the degree of isotope separation decreases. With NaBF<jats:sub>4</jats:sub> the separation factor is greater than with NaClO<jats:sub>4</jats:sub> under conditions which are otherwise the same. For electrolyte solutions containing ClO<jats:sub>4</jats:sub><jats:sup>-</jats:sup>, NO<jats:sub>3</jats:sub><jats:sup>-</jats:sup> and BF<jats:sub>4</jats:sub><jats:sup>-</jats:sup> 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.</jats:p>