Analyte concentration in traditional low temperature electrochemistry is solvation limited, but in molten salts solvation limits can be much higher. However, voltammetry measurements, which are predominately used in molten salt, are bounded to diffusion-limited ranges (10wt%. Thin-cell electrochemistry is not limited in concentration as other electrochemical measurements, and thus is a promising option for measuring these higher (>10wt%) concentrations. For this reason, thin-cell apparatuses and techniques have been developed for use in molten salts. These apparatuses can take low-latency measurements and have been tested in concentrations from 1-50wt%.