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Radiochimica Acta

International Journal for chemical aspects of nuclear science and technology

Editor-in-Chief: Qaim, Syed M.

IMPACT FACTOR 2018: 1.339

CiteScore 2018: 1.20

SCImago Journal Rank (SJR) 2018: 0.333
Source Normalized Impact per Paper (SNIP) 2018: 0.720

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Volume 103, Issue 7


Development of an automated batch-type solid-liquid extraction apparatus and extraction of Zr, Hf, and Th by triisooctylamine from HCl solutions for chemistry of element 104, Rf

Yoshitaka Kasamatsu / Aiko Kino / Takuya Yokokita / Kouhei Nakamura / Yukiko Komori
  • Graduate School of Science, Osaka University, Toyonaka, Osaka 560-0043, Japan
  • Nishina Center for Accelerator-Based Science, RIKEN, Wako, Saitama 351-0198, Japan
  • Other articles by this author:
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/ Keigo Toyomura / Takashi Yoshimura / Hiromitsu Haba / Jumpei Kanaya / Minghui Huang / Yuki Kudou / Naruto Takahashi / Atsushi Shinohara
Published Online: 2015-04-13 | DOI: https://doi.org/10.1515/ract-2014-2283


Solid-liquid extraction of the group 4 elements Zr and Hf, which are homologues of Rf (Z = 104), and Th, a pseudo homologue, by triisooctylamine (TIOA) from HCl solutions was performed by batch method. After examining the time required to reach extraction equilibrium for these elements in various concentrations of TIOA and HCl, we investigated in detail variations in the distribution coefficients (Kd) with TIOA and HCl concentrations. The Kd values of Zr and Hf increased with increasing the HCl and TIOA concentrations, suggesting an increase in the abundance of the anionic chloride complexes of Zr and Hf. On the other hand, the Kd values of Th were low in all the HCl concentrations studied, implying that Th does not form anionic species dominantly. We developed a new automated batch-type solid-liquid extraction apparatus for repetitive experiments on transactinide elements. Using this apparatus, we performed solid-liquid extraction employing the radioactive nuclides 89mZr and 175Hf produced by nuclear reactions and transported continuously from the nuclear reaction chamber by the He/KCl gas-jet system. It was found that the distribution behaviors in 7–11 M HCl are almost constant in the time range 10–120 s, and the Kd values are consistent with those obtained in the above manual experiment. This result suggests that the chemical reactions in the extraction process reach equilibrium within 10 s for Zr and Hf under the present experimental conditions. It took about 35 s for the extraction using the apparatus. These results indicate the applicability of the present extraction using the developed apparatus to 261Rf (T1/2 = 68 s) experiments.

Keywords: Zirconium; Hafnium; Thorium; Solid-liquid extraction; Triisooctylamine (TIOA); Rutherfordium

About the article

Accepted: 2015-02-19

Received: 2014-05-16

Published Online: 2015-04-13

Published in Print: 2015-07-28

Citation Information: Radiochimica Acta, Volume 103, Issue 7, Pages 513–521, ISSN (Online) 2193-3405, ISSN (Print) 0033-8230, DOI: https://doi.org/10.1515/ract-2014-2283.

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