It was noted that Soret coefficients were usually measured electrochemically by determining the concentrations at 2 points in a liquid column that was subjected to a temperature gradient. Here, the concentration differences were determined by means of absorption spectroscopy and Beer's law. The Soret coefficients were found for FeIII, CrIII and NiIII in molten LiCl-KCl eutectic (table 120).

T.R.Griffiths, N.J.Phillips: Journal of the Electrochemical Society, 1991, 138[12], 3575-81

Table 120

Soret Coefficients in LiCl-KCl Eutectic Melts