Highly efficient extraction separation of lanthanides using a diglycolamic acid extractant

ジグリコールアミド酸型抽出剤を用いたランタノイドの高効率抽出分離

下条 晃司郎   ; 青柳 登   ; 斎藤 拓巳*; 岡村 浩之   ; 久保田 富生子*; 後藤 雅宏*; 長縄 弘親  

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

,-dioctyldiglycolamic acid (DODGAA) enables the quantitative partitioning of all Ln ions from moderately acidic solutions, while showing selectivity for heavier lanthanides, and provides remarkably high extraction separation performance for Ln 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 with DODGAA proceeded through a proton-exchange reaction, forming a 1:3 complex, Ln(DODGAA). The stripping of Ln from the extracting phase was successfully achieved under acidic conditions. Time-resolved laser-induced fluorescence spectroscopy revealed that the extracted Eu ions were completely dehydrated by complexation with DODGAA.