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

32 Citations (Scopus)


Liquid-liquid extraction of lanthanide ions (Ln 3+ ) 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 Ln 3+ ions from moderately acidic solutions, while showing selectivity for heavier lanthanides, and provides remarkably high extraction separation performance for Ln 3+ 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 Ln 3+ with DODGAA proceeded through a proton-exchange reaction, forming a 1:3 complex, Ln(DODGAA) 3 . The stripping of Ln 3+ from the extracting phase was successfully achieved under acidic conditions. Time-resolved laser-induced fluorescence spectroscopy revealed that the extracted Eu 3+ 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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