TY - JOUR
T1 - Highly efficient extraction separation of lanthanides using a diglycolamic acid extractant
AU - Shimojo, Kojiro
AU - Aoyagi, Noboru
AU - Saito, Takumi
AU - Okamura, Hiroyuki
AU - Kubota, Fukiko
AU - Goto, Masahiro
AU - Naganawa, Hirochika
PY - 2014/2
Y1 - 2014/2
N2 - 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.
AB - 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.
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U2 - 10.2116/analsci.30.263
DO - 10.2116/analsci.30.263
M3 - Article
AN - SCOPUS:84893917948
VL - 30
SP - 263
EP - 269
JO - Analytical Sciences
JF - Analytical Sciences
SN - 0910-6340
IS - 2
ER -