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Trennung von Spaltprodukten durch Extraktionschromatographie

II. Trennung von Mutter-tochter-paaren

Journal of Radioanalytical and Nuclear Chemistry
Authors:
R. Denig
,
N. Trautmann
, and
G. Herrmann

Abstract  

The performance of columns to be used for separations of fission products by extraction chromatography was studied as a function of the loading of the support with extractant, of the flow rate and the temperature of the elutriant. Separations of molybdenum-technetium, antimony-tellurium, zirconium-niobium and thorium-protactinium were used as examples to prove the effectiveness of this method.

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Trennung von spaltprodukten durch Extraktionschromatographie

III. Auftrennung eines spaltproduktgemisches

Journal of Radioanalytical and Nuclear Chemistry
Authors:
R. Denig
,
N. Trautmann
, and
G. Herrmann

Abstract  

The separation of fission products which form anionic species in mineral acids and of uranium and neptunium from samples of neutron-irradiated uranium is described. The method used is extraction chromatography with tri-n-butylphosphate (TBP) and di-(2-ethylhexyl)-orthophosphoric acid (HDEHP) as extractants and polytrifluoromonochloroethylene powder as the solid support. In the first column Zr, U and Np are extracted with TBP from 8N HNO3/NaClO3. In the second column, HDEHP is applied as extractant and 9N HCl/NaClO3 as the mobile phase for the isolation of Nb, Sb, and I, and in the third column (HDEHP), the rare earths and Mo are extracted from 0.1N HCl. Finally with the fourth column (TBP), Te and Tc are isolated from 6N HCl. These four groups of elements are further separated by elution from the columns. From the final effluent containing Ru, Rh, Cs, Sr, and Ba, Ru is distilled from HClO4, and Rh is precipitated with NH4OH. The determination of chemical yields with X-ray fluorescence techniques is described for Zr, Mo, Te, Cs, Ce and U.

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Trennung von Spaltprodukten durch extraktionschromatographie

I. Bestimmung der verteilungskoeffizienten

Journal of Radioanalytical and Nuclear Chemistry
Authors:
R. Denig
,
N. Trautmann
, and
G. Herrmann

Abstract  

The possibilities for the separation of a complex fission product mixture by extraction chromatography have been investigated. Here the partition coefficients between three solvents and hydrochloric acid are reported for the following elements: Zn(II), Ge(IV), As(III), As(V), Se(IV), Zr(IV), Nb(V), Mo(VI), Tc(IV) Ru(III), Ru(IV), Rh(III), Ag(I), Cd(II), In(III), Sn(IV), Sb(III), Sb(V), Te(IV), I(oxidized), Cs(I), Ce(III), Tb(III), Tm(III), Ac(III), Th(IV), Pa(V), U(VI), Np(IV), Np(VI). As solvents tri-n-butylphosphate (TBP), tri-n-octylamine (TOA) and di-(2-ethylhexyl)-orthophosphoric acid (HDEHP) have been used. The partition coefficients have been measured by batch-experiments in which the solvents were adsorbed on polytrifluoromonochloroethylene powder.

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