Abstract
The simultaneous separation of Am and Cm from lanthanides is important for atomic energy fields. However, the process is difficult owing to the chemical behavior of trivalent metal ions with similar ionic radii. All lanthanides, Am, and Cm can be extracted by diglycolamide (DGA). In addition, relatively high separation factors between An and Ln were obtained by the extraction system of TODGA, DTPA (diethylenetriamine-N,N,N′,N″,N″-pentaacetic acid) and HNO3. In this work, DTPA-BA (diethylenetriamine-N,N′,N″-triacetic-N,N″-bisamide), which is an improved version of DTPA, was employed for the separation of Ln and An. After performing a basic study on DTPA-BA, a relatively high separation factor (approximately 8) for actinides/lanthanides was obtained. Then, the multi-step extraction was performed. Thus, the recoveries of 94.7 % for Nd and 4.7 % for Am and Cm in organic phase, and 5.3 % Nd and 95.3 % for Am and Cm in aqueous phase were obtained.
Acknowledgment
We would like to thank Mr. R. Ono and Prof. H. Shiroishi of the National Institute of Technology, Tokyo College for the calculation of metal concentration at multi-step extraction, Dr. N. Kozai of the Japan Atomic Energy Agency for the measurement by liquid scintillation counter, and Dr. Y. Ban for the useful discussion of multi-step extraction experiments. This study was partially supported by a Grant-in-Aid for Scientific Research (No. 18H03404) from the Ministry of Education, Culture, Sports, Science and Technology, Japan for Ln extractions, and by a Grant-in-Aid for Challenging Research (Exploratory, 18K19043) by the Japan Society for the Promotion of Science for An extractions.
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