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1981 (1)
1Author    KlausG. Heumann, Hans-Peter SchieferRequires cookie*
 Title    Calciumisotopenseparation mit Kryptanden als Komplexbildner Separation of Calcium Isotopes with Cryptand Complexes  
 Abstract    The calcium isotope separation in the liquid-liquid extraction system H2O/CHCI3 is investigated using [2.2.1] and [2.2.2] cryptands for complex formation as well as without complexing agent. An extraction procedure is used which allows the transfer of larger amounts of calcium into the CHCI3 phase although the high distribution coefficient favours calcium in the H2O phase. Without complexing agent in the extraction system, enrichment of the lighter calcium isotopes is already evident in the CHCI3 phase which is just the same as when using [2.2.1] cryptand. In the case of [2.2.2] cryptand as a com-plexing agent, the isotope separation is higher. The separation factor is calculated to be a = 1 + e = 1.011 for 40 Ca/ 48 Ca without complexing agent or with [2.2.1] cryptand and a = 1.015 in the system with [2.2.2] cryptand. For 40 Ca/ 44 Ca the e-value is smaller by nearly a factor of two. These separation factors are the highest which are determined in chemical systems for calcium isotopes. 
  Reference    Z. Naturforsch. 36b, 566—570 (1981); eingegangen am 17. Dezember 1980 
  Published    1981 
  Keywords    Isotope Separation, Calcium, Cryptand, Liquid-Liquid Extraction 
  Similar Items    Find
 TEI-XML for    default:Reihe_B/36/ZNB-1981-36b-0566.pdf 
 Identifier    ZNB-1981-36b-0566 
 Volume    36