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Using ion exchange chromatography, the dependence of the chlorine isotope separation on the degree of cross linkage of a strongly basic anion exchange resin was investigated. With increasing degree of cross linkage the elementary separation effect for the two stable isotopes  35 Cl and  37 Cl increases. In all experiments  35 Cl- is enriched in the resin phase, whereas  37 Cl- is enriched in the solution, using 0.1 M NaNO 3  as an eluant. Within the degree of cross linkage of 2 to 10 per cent investigated, there is a linear correlation of the elementary separation effect of the chlorine isotopes with the selectivity coefficient between the ions NO 3 - and Cl-. The results show that the electrolyte behavior of anionic isotope exchange reactions is comparable with that of cations. The  35 Cl/ 37 Cl isotope ratio is determined using thermal ionization mass spectrometry.

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Abhängigkeit der Chlor-Isotopenseparation vom Vernetzungsgrad eines stark basischen Anionenaustauschers / Dependence of Chlorine Isotope Separation on the Degree of Cross Linkage of a Strongly Basic Anion Exchange Resin