Abstract
Extraction of Ce(III), Am(III), and Eu(III) from HNO3 solutions with an acidic zirconium salt (HDBP ZS) of dibutyl hydrogen phosphate (HDBP) at Zr: HDBP = 1: 12 and with a mixture of HDBP ZS with chlorinated cobalt dicarbollide (CCD) in a polar diluent, a 1: 1 o-chloronitro-benzene-CCl4 mixture, was examined. This system exhibits a substantial synergistic effect, which is at a maximum (30–40 for all the elements examined) at the 1: 1 HDBP to CCD molar ratio. The synergistic effect observed in the HDBP ZS (1: 12)-CCD system in extraction of REE and TPE can be associated with interaction of Zr, CCD, and HDBP, resulting in formation of a complex acid, more hydrophobic and stronger than the initial compounds. The trends in variation of the metal extractability are identical to those for HDBP ZS and opposite to those for CCD. The Zr atom in the complex extractant binds three CCD anions, as well as DBP anion and HDBP molecules.
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Original Russian Text © D.N. Shishkin, B.Ya. Galkin, Yu.S. Fedorov, 2008, published in Radiokhimiya, 2008, Vol. 50, No. 6, pp. 541–544.
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Shishkin, D.N., Galkin, B.Y. & Fedorov, Y.S. Synergistic extraction of REE and TPE from HNO3 solutions with a CCD-HDBP ZS (1: 12) mixture in a polar diluent. Radiochemistry 50, 621–625 (2008). https://doi.org/10.1134/S1066362208060076
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DOI: https://doi.org/10.1134/S1066362208060076