Dielectric losses measured on a zeolite sample have been investigated to correlate these measurements with surface thermodynamic. The polarization conductivity measurement allows the determination of variables which are linked to the adsorption enthalpies and entropies but also to the system dynamic. To quantitatively interpret the results, it is necessary to know the energetic heterogeneity of the solid sample. The thermally stimulated current measurement (TSDC) appears as a possible tool. Therefore this new method of studying adsorption by combining two techniques seems promising. This paper is an introduction to the work under development.