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  • 1 Department of Physical Chemistry, Institute of Chemistry Maria Curie-Skłodovska University M. Curie-Skłodovska SQ. 3 20-031 Lublin Poland
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Studies of water adsorption and desorption on silica gel with a modified derivatograph are described. The dynamic gas chromatography step profile method was used to determine isotherms of adsorption and desorption from the TG curve. The obtained isotherms agree with those from other methods. The properties of surface liquid layers can be investigated by this method.