Solvent extraction of technetium(VII) and rhenium(VII) using a hexaoctylnitrilotriacetamide extractant

Shimojo, Kojiro ; Suzuki, Hideya; Yokoyama, Keiichi ; Yaita, Tsuyoshi; Ikeda, Atsushi

Liquid-liquid extraction for the removal of pertechnetate ( $^{99}$ TcO $_{4}$ $^{-}$ ) and perrhenate (ReO $_{4}$ $^{-}$ ) is reported using tripodal extractant -hexa--octylnitrilotriacetamide (HONTA) composed of three amide groups and a tertiary amine. The extraction behavior was compared with those using alkyldiamideamines (ADAAM(Oct) and ADAAM(EH)), and the commercial amine-type extractant, trioctylamine (TOA). HONTA quantitatively extracted $^{99}$ TcO $_{4}$ $^{-}$ and ReO $_{4}$ $^{-}$ in the pH range from 1.0 to 2.5 by co-extraction of protons. Extraction performance of extractants was improved in the order of HONTA ADAAM(Oct) ADAAM(EH) TOA. $^{99}$ TcO $_{4}$ $^{-}$ and ReO $_{4}$ $^{-}$ 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.

Language	:	English
Journal	:	Analytical Sciences
Volume	:	36
Number	:	12
Pages	:	p.1435 - 1437
Publication Year/Month	:	2020/12
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Paper URL	:	https://doi.org/10.2116/analsci.20C014
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Keywords	:	no keyword
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Registration No. : AA20200561
JAEA Abstracts No. : 49000156
Paper Submission No. : 23755

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