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Spectroelectrochemical Study of Uranium and Neptunium in LiCl-KCl Eutectic Melt

Experimental set up for spectroelectrochemical measurements was designed. Uranium(III) ions, UCl 63- , are formed during anodic dissolution of metallic uranium and prolonged contact of U(IV)-containing melts with uranium metal. UCl 4 dissolution in 3LiCl-2KCl melt leads to the formation of UCl 6 2- ions. They undergo a two-step electrochemical reduction: U 4+ → U 3+ recharge followed by U deposition. Neptunium(IV) chloride dissolves in 3LiCl-2KCl melt producing NpCl 62- ions. Electrochemical reduction of Np(IV) on a glassy carbon electrode results in the formation of NpCl 63-ions and then leads to the deposition of neptunium metal. Electronic absorption spectra of uranium (III, IV, V and VI) and neptunium (III and IV) species in 3LiCl-2KCl eutectic were measured at 450 o C.