Sequential separation of actinides and lanthanides by extraction chromatography using a CMPO-TBP/XAD7 column |
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Authors: | M Yamaura H T Matsuda |
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Institution: | 1. Insituto de Pesquisas Energéticas e Nucleares, Comiss?o Nacional de Energia Nuclear, Rua Travessa R, 400-CEP 05508-900, S?o Paulo, SP, Brazil
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Abstract: | CMPO/TBP sorbed on Amberlite XAD7 resin was used for the separation of actinides and lanthanides from nitric acid solutions
by extraction chromatography. The distribution ratios of actinides and lanthanide fission products (Ce, Eu) as a function
of acid concentration and some complexing agents were determined. In strong HNO3 medium (>1 mol/l) the tri-, tetra- and hexavalent actinides as well as the lanthanides have shown great affinity for the
CMPO/TBP/XAD7 sorbent. The same behavior was found in HCl medium except for trivalent actinides and lanthanides which show
lower distribution values in the same acid range. The effect of some complexing agents as DTPA and ammonium oxalate were also
investigated. In DTPA only hexavalent actinides showed higher distribution value. On the basis of these differences, an alternative
procedure for actinide-lanthanide separation and actinides from each other is proposed. |
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