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Abstract  

The importance of the extraction medium and its film geometry to the separation efficiency is illustrated by the example of the chromatographic extraction systems HDEHP-HCl-Eu3+ and TBP-HNO3−Sc3+. Starting from the geometry of the matrix, the effects of the exchange kinetics and flow pattern were experimentally proved. Exchange kinetics are described as a heterogeneous transport-limited reaction in the aqueous phase. Four ranges of the rate of exchange with the geometry of the matrix (pore diameter) were found. The flow patterns in the chromatographic layer can be established by the individual pore cross-sectional area of the matrix. The sum of the effects of exchange kinetics and flow patterns determines the chromatographic efficiency of the systems. Their relative effects in the two systems being investigated are discussed.

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Abstract  

In the course of ion-exchange separations of highly active solutions, the radiolysis gives rise to considerable disturbances and deteriorated separation results. On the example of241Am/242Cm separations some results of radiolysis investigations for Dowex 50X8 are briefly shown, and experiences with the choice of parameters of a high-pressure column system are described for several examples.

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Änderung der Leistungfähigkeit Chromatographischer Systeme beim Übergang zu Hohen Aktivitäten

I. Vergleich der Alpha- und Gammaradiolyse eines Kationenaustauschers Bezüglich Seiner Änderungen des Gewichtes, der Salzspalt-und Restkapazität Sowie Seines Quellvermögens

Journal of Radioanalytical and Nuclear Chemistry
Authors: V. Dornow, S. Specht, W. Weinländer, and H. Born

Abstract  

The effect of the alpha and gamma radiation were studied on the characteristics of the cation exchanger resin AG50WX8.

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Abstract  

The analytical use of the prompt gamma-rays originating from neutron capture is a valuable completition of the conventional neutron activation analysis. The application of the external radiation tube P2 of the research reactor in Munich, an Am—Be neutron source of 300 mCi and a 1 mg252Cf neutron source is discussed.

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Änderung der Leistungsfähigkeit Chromatographischer Systeme beim Übergang zu hohen Aktivitäten

II. Vergleich des Einflusses der α-und γ-Radiolyse Eines Kationenaustauschers Auf Verteilungskoeffizienten, Trennfaktoren und Bodenhöhen

Journal of Radioanalytical and Nuclear Chemistry
Authors: S. Specht, V. Dornow, W. Weinländer, and H. Born

Abstract  

The effect of the alpha and gamma radiation were studied on the characteristics of the cation exchanger resin AG 50WX8.

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