title: Electrochemical oxidation of ²⁴³Am(III) in nitric acid by a terpyridyl-derivatized electrode.
abstract: Selective oxidation of trivalent americium (Am) could facilitate its separation from lanthanides in nuclear waste streams. Here, we report the application of a high-surface-area, tin-doped indium oxide electrode surface-derivatized with a terpyridine ligand to the oxidation of Am(III) to Am(V) and Am(VI) in nitric acid. Potentials as low as 1.8 volts (V) versus the saturated calomel electrode were applied, 0.7 V lower than the 2.6 V potential for one-electron oxidation of Am(III) to Am(IV) in 1 molar acid. This simple electrochemical procedure provides a method to access the higher oxidation states of Am in noncomplexing media for the study of the associated coordination chemistry and, more important, for more efficient separation protocols.
authors.affiliation: Department of Chemistry, The University of North Carolina at Chapel Hill, Chapel Hill, NC 27599, USA.
authors.forename: Christopher J
authors.initials: CJ
authors.lastname: Dares
authors.affiliation: Department of Chemistry, The University of North Carolina at Chapel Hill, Chapel Hill, NC 27599, USA.
authors.forename: Alexander M
authors.initials: AM
authors.lastname: Lapides
authors.affiliation: Idaho National Laboratory, Aqueous Separations and Radiochemistry Department, Idaho Falls, ID, USA.
authors.forename: Bruce J
authors.initials: BJ
authors.lastname: Mincher
authors.affiliation: Department of Chemistry, The University of North Carolina at Chapel Hill, Chapel Hill, NC 27599, USA. tjmeyer@unc.edu.
authors.forename: Thomas J
authors.initials: TJ
authors.lastname: Meyer