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'Ion Exchange Chromatography' in keywords
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1979 (2)
1Author    KlausG. Heumann, Helmut KlöppelRequires cookie*
 Title    Abhängigkeit der Calcium-Isotopenseparation bei der Ionenaustauschchromatographie von der HN03-Elutionsmittelkonzentration Calcium Isotope Separation by Ion Exchange Chromatography in Dependence on the HNO3 Eluant Concentration  
 Abstract    Using a strongly acidic cation exchanger resin, the dependence of the calcium isotope separation on the HNO3 eluant concentration is investi-gated on column experiments. The elementary separation effect of the isotope ratios 44 Ca/ 40 Ca and 48 Ca/ 40 Ca is determined. Up to HN03 concentrations of about 1.5 M the lighter calcium isotopes are enriched in the resin phase, whereas, using more concentrated HN03 solutions, the heavier isotopes are enriched in the ion ex-changer. 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. 
  Reference    Z. Naturforsch. 34b, 1044—1045 (1979); eingegangen am 22. Januar 1979 
  Published    1979 
  Keywords    Isotope Separation, Calcium, Ion Exchange Chromatography 
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 TEI-XML for    default:Reihe_B/34/ZNB-1979-34b-1044_n.pdf 
 Identifier    ZNB-1979-34b-1044_n 
 Volume    34 
2Author    KlausG. Heumann, Paul Roßmann, Anni Schwarz, Alfred WindfelderRequires cookie*
 Title    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  
 Abstract    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 C1 and 37 C1 increases. In all experiments 35 C1~ is enriched in the resin phase, whereas 37 C1~ is enriched in the solution, using 0.1 M NaNC>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 NO3"" and Cl -. The results show that the electrolyte behavior of anionic isotope exchange reactions is comparable with that of cations. The 35 C1/ 37 C1 isotope ratio is determined using thermal ionization mass spectrometry. Untersuchungen von Isotopieeffekten bei hetero-genen Ionenaustauschreaktionen sind bereits bei einigen Kationen durchgeführt w T orden, wie z.B. 
  Reference    Z. Naturforsch. 34b, 406—411 (1979); eingegangen am 4. Dezember 1978 
  Published    1979 
  Keywords    Isotope Separation, Chlorine, Ion Exchange Chromatography, Mass Spectrometry 
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 TEI-XML for    default:Reihe_B/34/ZNB-1979-34b-0406.pdf 
 Identifier    ZNB-1979-34b-0406 
 Volume    34