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  • 1
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Calcium Isotope Separation and Reaction Enthalpy. Calcium Isotope Separation and Determination of Reaction Enthalpy in Ion Exchange Using a Strongly Acidic Cation Exchange ResinIn the system of a strongly acidic cation exchanger/BaCl2 solution the isotope separation between 40Ca2+ and 48Ca2+ is investigated using column experiments. 48Ca2+ is enriched in the solution phase whereas 40Ca2+ is enriched in the resin phase. A strong dependence of the isotope separation effect on the concentration of the BaCl2 solution is found. The isotope separation increases with decreasing concentration. The isotope separation also depends on temperature: the isotope separation effect increases with decreasing temperature. A ΔH-value of  - 5.8 J/mol is determined for the calcium isotope exchange reaction.
    Notes: In säulenchromatographischen Versuchen wird im System stark saurer Kationenaustauscher/BaCl2-Lösung die Isotopenseparation zwischen 40Ca2+ und 48Ca2+ untersucht. 48Ca2+ reichert sich dabei in der Lösung des Systems an. Eine starke Abhängigkeit des Isotopentrenneffekts von der Konzentration des Fremdelektrolyten BaCl2 ist zu beobachten, wobei die Isotopenseparation bei niedrigerer Konzentration zunimmt. Desgleichen erhöht sich der Trenneffekt mit fallender Temperatur. Für die Calciumisotopenaustauschreaktion wird ein ΔH-Wert von  - 5,8 J/mol bestimmt.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
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