CPS L 946

A thermodynamic inequality, providing the possibility of calculating the limiting number of adsorbed layers from the excess adsorption data, is discussed. For identical cross-sectional areas of molecules of both components this inequality simplifies considerably and defines the limiting value of the surface phase capacity. Therefore, it may be used as criterion of the accuracy of the surface phase capacity value evaluated by other methods. Taking this criterion into account a method is proposed to determine the surface phase capacity and number of adsorbed layers from the excess adsorption data. It is verified by using the excess adsorption data available from the literature.