A crucial question concerning interfacial wetting phenomena is how an organic solvent interacts with a surfactant layer's hydrocarbon chains. This interaction will, as an example, influence the swelling of the surfactant layer and, hence, the curvature of inverted w/o micelles. We have chosen to use chromatographic measurements to study the interactions between solvents and surfactants. The retention time, obtained by HPLC measurements, will be a measure on the solubility of the solvent in the hydrocarbon chain layer. From measurements of the retention time's temperature dependence and analyzing both the shift in retention time and peak tailing, an adsorption isotherm can be calculated. Combining the experimental results with thermodynamic modeling opens for a molecular understanding of solvent-surfactant interactions.