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Selective extraction of light lanthanides(III) with 18-crown-6 and perfluorooctanoate

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Abstract

The extraction of La(III), Gd(III), and Lu(III) with 18-crown-6 (18C6) has been studied using pentadecafluorooctanoate (PDFO) as a counter anion. Very high extractability of La(III) was observed in various organic solvents such as benzene, chloroform, 1,2-dichloroethane, and nitrobenzene. The predominant species extracted into benzene was found to be Ln(PDFO)3 (18C6), and the extraction constants (K ex,s1 =[Ln(PDFO)3 (18C6)]org/[Ln3+][PDFO]3[18C6]org) were 1013.12 for La(III), 109.74 for Gd(III), and 109.67 for Lu(III). These values are 1010 times higher than those in the trichloroacetate-18C6 system reported previously. The present PDFO-18C6 system was superior to the picrate- and hexafluoroacetylacetonate-18C6 system for the separation efficiency of light lanthanides(III).

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Authors and Affiliations

  1. Department of Chemistry, Faculty of Science, Ibaraki University, 310, Mito, Japan

    H. Imura & H. Mito

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  1. H. Imura
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  2. H. Mito
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Imura, H., Mito, H. Selective extraction of light lanthanides(III) with 18-crown-6 and perfluorooctanoate. Journal of Radioanalytical and Nuclear Chemistry, Articles 189, 229–235 (1995). https://doi.org/10.1007/BF02042601

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  • DOI: https://doi.org/10.1007/BF02042601

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