Maximum bubble pressure method (MBPM) was used to determine the dynamic surface tension of aqueous solution of cetyltrimethylamonium bromide (CTAB). Adsorption kinetics of CTAB at the air/water interface has been studied. Effects of temperature, concentration of CTAB, additives on the adsorption kinetics were also investigated. The results show that at beginning, the adsorption process is controlled by a diffusion step; whereeas toward the end, it changes to an activation mechanism with an adsorption barrier of between 4 and 10 kJ.mol^-^1. It seems that this burrier does not depend on the temperature and additives. Additives influence diffusion process significantly.

Key words: ADSORPTION, KINETIC STUDY, SURFACE TENSION