Solvent Extraction of Technetium(VII) and Rhenium(VII) Using a Hexaoctylnitrilotriacetamide Extractant

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  • SHIMOJO Kojiro
    Materials Sciences Research Center, Japan Atomic Energy Agency (JAEA) Institute of Resource Ecology, Helmholtz-Zentrum Dresden-Rossendorf (HZDR)
  • SUZUKI Hideya
    Nuclear Science and Engineering Center, Japan Atomic Energy Agency (JAEA)
  • YOKOYAMA Keiichi
    Materials Sciences Research Center, Japan Atomic Energy Agency (JAEA)
  • YAITA Tsuyoshi
    Materials Sciences Research Center, Japan Atomic Energy Agency (JAEA)
  • IKEDA-OHNO Atsushi
    Institute of Resource Ecology, Helmholtz-Zentrum Dresden-Rossendorf (HZDR)

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Abstract

<p>Liquid–liquid extraction for the removal of pertechnetate (99TcO4−) and perrhenate (ReO4−) is reported based on using the tripodal extractant N,N,N′,N′,N″,N″-hexa-n-octylnitrilotriacetamide (HONTA) composed of three amide groups and a tertiary amine. The extraction behaviors were compared with those using alkyldiamideamines (ADAAM(Oct) and ADAAM(EH)), and the commercial amine-type extractant, trioctylamine (TOA). HONTA quantitatively extracted 99TcO4− and ReO4− in the pH range from 1.0 to 2.5 by the co-extraction of protons. The extraction performance of the extractants was improved in the order of HONTA > ADAAM(Oct) > ADAAM(EH) > TOA. 99TcO4− and ReO4− in the extracting phase were successfully stripped using neutral aqueous solutions as the receiving phase, and the extraction ability of HONTA was maintained after five repeated uses.</p>

Journal

  • Analytical Sciences

    Analytical Sciences 36 (12), 1435-1437, 2020-12-10

    The Japan Society for Analytical Chemistry

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