Abstract
Solvent extraction of europium(III) and thulium(III) has been investigated by high molecular weight β-diketone derivatives, such as dodecylbenzoyltrifluoroacetone (LIX51), benzoylisooctanoylmethane (LIX54) and dibenzoyl-methane (DBM), in the presence of neutral donors, such as tributyl phosphate (TBP) and trioctylphosphine oxide (TOPO). The distribution ratio was largely enhanced by a synergistic effect. Tris-/J-diketonates forms mono- and di-adducts with TBP and TOPO depending on the kind of β-diketones and central metals. The extraction constants with β-diketones alone were of the order LIX 51 ≫ LIX 54>DBM, whereas the adduct formation constants followed the order LIX 51>DBM>LIX 54. The separation factor between thulium and europium decreased in the presence of neutral ligands.
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Nakamura, S., Surakitbanharn, Y. & Akiba, K. Synergistic Extraction of Europium and Thulium by Mixtures of High Molecular Weight β-Diketones and Neutral Organophosphorus Esters. ANAL. SCI. 6, 295–299 (1990). https://doi.org/10.2116/analsci.6.295
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DOI: https://doi.org/10.2116/analsci.6.295