Document Type

Report

Publication Date

3-2004

Abstract

This research report outlines the current status and progress associated with the electrochemical separation of Curium and Americium.

Data collection and analysis of the Ce3+/Ce4+ redox couple in various supporting electrolytes has continued. All electrolyte systems were investigated at Pt, Au, and Glassy Carbon working electrodes. Analysis of these data was accomplished by performing appropriate background subtractions to reveal net peaks due to Ce redox behavior. Successful identification of the Ce redox couple was achieved with all electrolyte/electrode systems, although a decline in peak resolution was observed with increasing acid concentration. Optimal conditions in this experiment were realized with a 6.0 mM Ce concentration, 0.1 M H2SO4 supporting electrolyte, and scan rate of 0.02 V/s.

An investigation into ionic strength is being conducted for the Ce system, using varying concentrations of K2SO4 in place of the H2SO4 supporting electrolyte solutions. The data suggests that acidity is the key variable in the system with higher resolution and lower splitting of the Ce3+/Ce4+ redox couple.

Finally, the investigation of the Sm redox couple was initiated by employing the conditions determined as optimal for the Ce experiment. Successful resolution of the Sm redox couple was accomplished using this system. Future work on this species will include further experiments, similar to those conducted for Ce, which will vary the working electrode and supporting electrolyte.

Keywords

Actinide elements; Americium; Cerium; Curium; Electrochemistry; Nuclear fuels; Oxidation-reduction reaction; Rare earth metals; Separation (Technology)

Disciplines

Analytical Chemistry | Chemistry | Nuclear | Oil, Gas, and Energy | Physical Chemistry

Language

English


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