The application of a pulsating bubble tensiometer to determine rheological parameters of the gas -liquid interface was demonstrated. The results obtained at 25, 35 and 45 degreesC for aqueous solutions (10(-3), 10(-2) and 10(-1) M) of two surfactants: anionic SDS and cationic CTAB were used to calculate rheological constants based on visco-elastic model of the interface. Dependencies of the dilatational elasticity and viscosity on temperature and concentration of the solutions were discussed. Conclusions regarding the practical meaning of the results were presented, indicating their possible application also in the biomedical field (e.g., for the pulmonary surfactant system).