Studies on the coulometric determination of uranium and plutonium employing a graphite electrode

Electrochemistry of actinides on reduced graphene oxide: craving for the simultaneous voltammetric determination of uranium and plutonium in nuclear fuel

“…to simultaneously determine U and Pu in the same sample. [27][28][29] However, the chance of interference from the redox reaction between Pu(IV) and U(IV) still exists during the coulometric determination of U in the presence of Pu on a single working electrode. Therefore, a pre-reduction step at 0.085 V vs. SCE is performed to completely reduce all Pu into Pu(III) and then the potential is set at À0.325 V vs. SCE for the reduction of U(VI) to U(IV).…”

Electrochemical reduction of U(VI) in H2SO4at gold nanoporous film electrode

“…They do not, however, offer reproducible surface conditions. Also the electrolysis is slow and the background currents are relatively large [11]. Silver dissolves in sulphuric acid electrolyte, and Bi, Cu, Mo and Hg are the main interfering elements.…”

“…Due to hazards associated with the use of mercury, solid electrodes are preferred for the bulk reduction of U(VI) in acidic medium. The determination of uranium using solid electrodes like graphite [11], silver [12], platinum [13], and gold [14] has been reported previously. Carbonaceous electrodes such as graphite, glassy carbon, etc., are known to offer the favorable range of potential required for U(VI) reduction.…”

Selective Electrochemical Separation and Recovery of Uranium from Mixture of Uranium(VI) and Lanthanide(III) Ions in Aqueous Medium

“…Contrary to that, coulometry is an absolute electroanalytical method which avoids addition of chemical impurities to analyte solution and thus prevents secondary active waste generation. Further, it also diminishes contact dose to the nuclear worker. − To the best of our knowledge, electrochemical techniques are not employed for uranium separation in aqueous medium at present. Electrochemical separation technique is based on the principle of selective electrodeposition of analyte species of interest in the electrode surface from mixed solution by applying a suitable constant potential.…”