| Summary: | NdCl<sub>3</sub> and CeCl<sub>3</sub> are characterized by the very close proximity of their standard reduction potentials. Thus, they represent the most challenging salt mixtures with respect to decoupling electrochemical responses and calculating concentrations. The goals of this study include the determination of the apparent standard potentials of both Nd<sup>3+/</sup>Nd<sup>2+</sup> and Ce<sup>3+</sup>/Ce in LiCl-KCl-CeCl<sub>3</sub> or NdCl<sub>3</sub> mixtures. Matrix and concentration effects on fundamental electrochemical properties are of particular interest, as these thermodynamic properties will impact the ability to use voltammetry to measure concentrations in unknown samples. Several LiCl-KCl-CeCl<sub>3</sub> or NdCl<sub>3</sub> mixtures with NdCl<sub>3</sub>/CeCl<sub>3</sub> concentrations ranging from 4 to 10 wt% at 753 to 793 K have been explored. For apparent standard potential values of CeCl<sub>3</sub>, a good agreement was obtained with the literature data, except above 773 K.
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