Voltammetric Study on Ion Transfer of Uranium(VI)Ion Between Aqueous and Nitrobenzene Phases in the Presence of Bis(diphenylphosphoryl)methane
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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.
- Analytical Sciences
Analytical Sciences 14(1), 67-70, 1998-02-10
The Japan Society for Analytical Chemistry