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- W744542450 abstract "Abstract: U(IV) ion, the valance state of uranium presumed at in a deep-depth disposal of a spent fuel, wasprepared and separated from U(VI) ion. In order to prepare U(IV) ion, tests were performed by adding severalreducing agents into a uranyl solution or by dissolution of uranium oxide in a mixed acid added with a reducingagent. The valance states of the uranium in the prepared solutions were identified by separating two ions witha Dowex AG 50W-X8 cation exchange resins and measuring the solutions using a laser-induced fluorescencespectroscopy. However, U(IV) and U(VI) were not separated by a Lichroprep Si60 exchange resin in the sameseparation condition of Pu(IV) and Pu(VI). Key words : uranium valance, separation, spectroscopy, chromatography 1. 서 론 대기중에서 탄산농도가 높지 않고 pH가 2.0 이상인수용액에 용해되어 있는 경우 우라늄은 UO 22+ , UO 2 (OH) 2 (aq), UO 2 (OH) 3− 와 같이 6가(U(VI))로 존재하는것으로 알려져 있다. 1 그러나 지하수에서는 지하수의산화환원 전위 및 pH에 따라 U(VI) 뿐 아니라 U 4+ ,U(OH) 3+ , U(OH) 4 (aq)와 같이 4가우라늄으로 존재할 ★ Corresponding authorPhone : +82-(0)42-868-8524 Fax : +82-(0)42-868-8524E-mail : nsskim@kaeri.re.kr" @default.
- W744542450 created "2016-06-24" @default.
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- W744542450 date "2008-01-01" @default.
- W744542450 modified "2023-09-27" @default.
- W744542450 title "Preparation and identification of U(IV) for the investigation of behaviors of uranium in a disposal repository" @default.
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