Аннотация:A procedure for calculating the adsorption parameters from data from the concentration dependence of the two-dimensional pressure has been developed for substances the adsorption of which obeys the Frumkin isotherm. It is based on computer-calculated parameter values which are such as to yield a minimum sum of quadratic deviations of the theoretically calculated interfacial-tension values from the experimental values. It is shown that with the method proposed, the adsorption parameters can be determined more accurately than with other known methods. The conditions are discussed under which the procedure of finding the parameters becomes ambiguous.