The inverse gas chromatographic method of reversed-flow gas chromatography is extended to the measurement of the probability density function f( ) for the adsorption energies on heterogeneous surfaces, as a function of the experimental time. The values of f( ) are not found from the solution of an integral equation, but by their direct calculation from experimental data in a very simple way. The method is applied to the adsorption of (CH 3 ) 2 S on CaCO 3 and CaCO 3 + C, in the presence and in the absence of NO 2 , at two temperatures around 303 and 323 K. The kinetic physicochemical parameters for the adsorption/desorption phenomena are also calculated for the above systems. The normalization of the f( ) found, with respect to time, is easily done.

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