Highly efficient extraction separation of lanthanides using a diglycolamic acid extractant

Kojiro Shimojo, Noboru Aoyagi, Takumi Saito, Hiroyuki Okamura, Fukiko Kubota, Masahiro Goto, Hirochika Naganawa

    Research output: Contribution to journalArticlepeer-review

    53 Citations (Scopus)


    Liquid-liquid extraction of lanthanide ions (Ln3+) using N,N-dioctyldiglycolamic acid (DODGAA) was comprehensively investigated, together with fluorescence spectroscopic characterization of the resulting extracted complexes in the organic phase. DODGAA enables the quantitative partitioning of all Ln3+ ions from moderately acidic solutions, while showing selectivity for heavier lanthanides, and provides remarkably high extraction separation performance for Ln3+ compared with typical carboxylic acid extractants. Furthermore, the mutual separation abilities of DODGAA for light lanthanides are higher than those of organophosphorus extractants. Slope analysis, loading tests, and electrospray ionization mass spectrometry measurements demonstrated that the transfer of Ln3+ with DODGAA proceeded through a proton-exchange reaction, forming a 1:3 complex, Ln(DODGAA)3. The stripping of Ln3+ from the extracting phase was successfully achieved under acidic conditions. Time-resolved laser-induced fluorescence spectroscopy revealed that the extracted Eu3+ ions were completely dehydrated by complexation with DODGAA.

    Original languageEnglish
    Pages (from-to)263-269
    Number of pages7
    Journalanalytical sciences
    Issue number2
    Publication statusPublished - Feb 2014

    All Science Journal Classification (ASJC) codes

    • Analytical Chemistry


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