Voltammetric Study on Ion-Transfer of Uranium(VI)Ion between Aqueous and Nitrobenzene Phase in the Presence of Bis(diphenylphosphoryl)methane

KITATSUJI Yoshihiro, AOYAGI Hisao, YOSHIDA Zenko, KIHARA Sorin

doi:10.2116/analsci.14.67

Voltammetric Study on Ion-Transfer of Uranium(VI)Ion between Aqueous and Nitrobenzene Phase in the Presence of Bis(diphenylphosphoryl)methane

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KITATSUJI Yoshihiro

Advanced Science Research Center, Japan Atomic Energy Research Institute
AOYAGI Hisao

Advanced Science Research Center, Japan Atomic Energy Research Institute
YOSHIDA Zenko

Advanced Science Research Center, Japan Atomic Energy Research Institute
KIHARA Sorin

Department of Chemistry, Kyoto Institute of Technology

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タイトル別名

Voltammetric Study on Ion Transfer of Uranium(VI) Ion between Aqueous and Nitrobenzene Phases in the Presence of Bis(diphenylphosphoryl)methane.
Voltammetric Study on Ion-Transfer of U

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説明

The ion transfer of UO₂²⁺ ion across an aqueous(w)/nitrobenzene(NB) interface was investigated by ion-transfer polarography using an aqueous electrolyte dropping electrode. It was found that the transfer of UO₂²⁺ from w to NB was facilitated by bis(diphenylphosphoryl)methane (BDPPM), and that the transfer reaction had irreversible characteristics. A potential generated at the UO₂²⁺ ion-selective electrode, which was prepared while referring to ion transfer data, revealed a reversible Nernstian response against the concentration of the UO₂²⁺ ion in an aqueous sample solution. The irreversible nature of the UO₂²⁺ transfer observed in the polarogram resulted from such slow processes involved in the ion transfer reaction as the adsorption/desorption of BDPPM or the UO₂²⁺-BDPPM complex at the w/NB interface. The feasibility of the electrolytic separation of uranium from neptunium and plutonium on the basis of a selective ion-transfer reaction is discussed.