The coupled transport of In(III) from concentrated HCl media (2.2-4 mol dm(-3)) on a supported liquid membrane system using as carrier the commercial trialkylamine ADOGEN 364 dissolved in kerosene was studied. The effect of different parameters such as the stirring rates of feed and strip solutions, carrier concentration, solution volume/membrane area ratio and initial metal concentration on the system are discussed. The experimental results obtained are explained on the basis of a physicochemical model considering diffusion of the metal species in the feed solution, chemical reaction in the membrane surface and diffusion of species through the membrane phase. The values of the mass transfer coefficients in the aqueous and organic phases and the rate constants of the reactions were determined. The influence of the hydrochloric acid concentration on these parameters is established.