Untitled

Electrochemical Oxidation of Am(III) and Am(V) Ions in HNO3 Solutions Containing Potassium Phosphotungstate K10P2W17O61

“…The procedures of electrochemical oxidation of Am(III) and Am(V) and spectrophotometric monitoring of various oxidation states of americium are presented elsewhere [7,8].…”

“…In [7,8] we studied electrochemical oxidation of Am(III) and Am(V). Additional studies and comprehensive analysis of experimental data suggested a new interpretation of the kinetics of electrochemical oxidation of Am(III), revealing common features and differences in the kinetics of Am(III) and Am(V) electrochemical oxidation.…”

“…We studied self-reduction of Am(IV) at various concentrations of HNO 3 and KPW and different dose rates (J) [7]. We found that Am(IV) converts into Am(III) by first-and zero-order reactions with respect to the Am(IV) concentration:…”

Formal oxidation potentials of the Np(VI)-Np(V) couple and schemes of formal oxidation potentials of Np and am ions in HNO3 solutions containing potassium phosphotungstate K10P2W17O61

“…The formal oxidation potentials of the Am(IV)-Am(III) (E f 0 = 1.54 V) and Am(VI)-Am(V) (E f 0 = 1.55 V) couples were determined experimentally in our studies [12,13]. The Comparison of the schemes of the Np and Am potentials for the phosphotungstate solutions at pH 4.0, constructed previously [1], and for 1 M HNO 3 solutions containing KPW shows that, in both systems, the E f 0 values for respective couples vary in the same direction with close shifts of the potential shifts.…”

“…In these schemes, the formal oxidation potentials E f 0 of the М(VI)-М(V) couple for the Np [1] and Am [2] ions and of the М(IV)-М(III) couple for the Am ions [3] were measured by us experimentally. The E f 0 value for the Np(IV)-Np(III) couple was estimated from the shift of the potential of the М(IV)-М(III) couple toward negative values compared to E f 0 in 1 M HClO 4 , equal to 1.0 V.…”