  The adsorption at the interface between an aqueous solution of several
surface-active agents and another fluid (air or oil) phase is addressed
theoretically. We derive the kinetic equations from a variation of the
interfacial free energy, solve them numerically and provide an analytic
solution for the simple case of a linear adsorption isotherm. Calculating
asymptotic solutions analytically, we find the characteristic time scales of
the adsorption process and observe the behavior of the system at various
temporal stages. In particular, we relate the kinetic behavior of the mixture
to the properties of its individual constituents and find good agreement with
experiments. In the case of kinetically limited adsorption, the mixture
kinetics is found to be considerably different from that of the
single-surfactant solutions because of strong coupling between the species.
