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Experimental geochemistry of Pu and Sm and the thermodynamics of trace element partitioning |
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| Institution: | 1. Department of Chemistry, Materials and Chemical Engineering “G. Natta”, Politecnico di Milano, Piazza L. Da Vinci 32, I-20133 Milano, Italy;2. ENEA, Agency New Technology, Energy and Sustainable Economic Development, UTRINN IFC, Via Anguillarese 301, I-00123 Rome, Italy;3. Helmholtz Institute Ulm (HIU), Electrochemistry I, Helmholtz Strasse 11, 89081 Ulm, Germany;4. Karlsruhe Institute of Technology, P.O. Box 3640, 76021 Karlsruhe, Germany;5. CNR — Istituto di Chimica per il Riconoscimento Molecolare, Via L. Mancinelli, 7, I-20131 Milano, Italy;6. Department STEBICEF, University of Palermo, Via Archirafi n.32, I-90123 Palermo, Italy |
| Abstract: | The partitioning of Pu and Sm between diopside/liquid and whitlockite/liquid has been investigated experimentally to evaluate the geochemical coherence of Pu and the light REEs. is 2̃ for both diopsidic pyroxene and whitlockite. This small amount of fractionation would be decreased further if Pu were compared to Ce or Nd. Our experimental results thus validate the suggestion that Pu behaves as a LREE during igneous processes in reducing environments.Our data and the data of Ray et al. (1983) indicate that temperature rather than melt composition is the most important control on elemental partitioning. This is true even though we demonstrate that additions of only 1–2 wt.% of P2O5 to the diopside-anorthite-albite system change PuDcpx by a factor of two. Our data suggest that P2O5 in aluminosilicate melts serves as a complexing agent for the actinides and lanthanides. |
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