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Matsutani, Takafumi; Sasaki, Yuji; Katsuta, Shoichi*
Analytical Sciences, 37(11), p.1603 - 1609, 2021/11
Times Cited Count：7 Percentile：48.15(Chemistry, Analytical)We investigated the chemical behavior of lanthanides (Ln) using diglycolamide extractant with multistage extraction. We obtained the breakthrough curves for light and middle Ln. Our study reveals that the metal extraction limit depends on their 
values and metal concentrations used in the experiments. From the multistage extractions of 15 aqueous phases and 15 organic phases, three curves (extraction curves, back-extraction curves, and separation curves) were obtained by changing the nitric acid concentration. As an example, under a condition of the separation curve experiment (aqueous phase: 0.5 M HNO
, organic phase: 0.1 M TDDGA (
-tetradecyl-diglycolamide) in 
-dodecane), a recovery of more than 99% of Sm in the organic phase with less than 1% Nd can be obtained.
Matsutani, Takafumi*; Sasaki, Yuji; Katsuta, Shoichi*
no journal, ,
The mutual separation of lanthanide is difficult because the chemical behavior of lanthanides is very analogous. Thus, the task to develop the mutual separation method among lanthanide is important. Here, we examined to separate lanthanides using batch-wise multi-stage extraction with TDDGA. The batch-wise multi-stage extraction can be evaluated based on the plate-theory of chromatography, thus we investigated the basic results of batch-wise multi-stage extractions.
