Abhängigkeit der Calcium-Isotopenseparation bei der Ionenaustauschchromatographie von der HNO3-Elutionsmittelkonzentration / Calcium Isotope Separation by Ion Exchange Chromatography in Dependence on the HNO3 Eluant Concentration

Abstract

Abstract Using a strongly acidic cation exchanger resin, the dependence of the calcium isotope separation on the HNO3 eluant concentration is investigated on column experiments. The elementary separation effect of the isotope ratios 44Ca/40Ca and 48Ca/40Ca is determined. Up to HNO3 concentrations of about 1.5 M the lighter calcium isotopes are enriched in the resin phase, whereas, using more concentrated HNO3 solutions, the heavier isotopes are enriched in the ion exchanger. A comparison of these results with those using hydrochloric acid and perchloric acid show, that there is a strong dependence of the isotope separation on the concentration and the counter ion of the eluant solution