Journal o f Radioanalytical Chemistry, Vol. 60 (1980} 353-363 CHROMATOGRAPHISCHE Am-/Cm-TRENNUNG IN SCHWACH SAUREN OXIDIERENDEN MEDIEN IN DER WXSSRIGEN- UND DEM CHELATBILDENDEN AUSTAUSCHER DOWEX-AI IN DER STATION~,REN PHASE F. EL-SWEIFY,* S. A. ALI Insritut l~r Radiochemie, Kernforschungszentrum Karl~ruhe (BRD) (Received July 28, 1980) The separation of Am/Cm was studied in batch and dynamic experiments. It was achieved chromatographicaly on the chelating ion exchanger Dowex-Chelating-Resin-Al making use of the great difference between the complexing ability of trivalent and pentavalent oxidation states. For this purpose, the influence of some variables on the Am/Cm separation factor and on the stability of the adjusted pentavalent state was studied, e.g. the weight of ion exchanger, the time of contact and the pH-values of the solutions. Comparative investigations were carried out on the pentavalent ions of neptunium, plutonium and americium as well as on the hexavalent ions of plutonium and americium, where a significant difference in their behaviours was found. Einleittmg In der Interactinoidentrennung stout die Ameficium-Curium-Trennung den schwierigsten Schritt dar. Die Ursache liegt an dem sehr geringen chemischen Unter- schied der unter normalen Bedingungen vofliegenden 3-wertigen Ionen, wodurch ftir quantitative Trennungen merhfache Trennstufen efforderlich sind. KRAAK und VAN DER HEIJDEN haben die Absorption yon Am(III) und Cra(III) aus verschiedenen nitrathaltigen Medien an Dowex-1 untersucht. ~ Je nach der Nitratkonzentration und der Zusammensetzung der mobilen Phasen betragen die h~chsten Trennfaktoren 2 bis 2,3. Die Nachteile die~r Trennmethode beruhen *Permanent address: Nuclear Chemistry Department, Nuclear Research Centre, Atomic Energy Establishment, Cairo, Egypt. J. Radioanal. Chem. 60 {1980} 353