Abstract
The relationship between charge of maximum adsorption of organic substances (σ max), charge of minimum adsorption energy of solvent and charge of zero net solvent dipole orientation (σ min) is discussed. It is shown that σ max depends on both the polarity and the polarizability of the adsorbate molecule. The condition under which σ max=σ min is illustrated. A method is suggested to separate induced lipole effects from those related to the permanent dipole of the adsorbate molecule. The resulting graphical relationship between charge of maximum adsorption and polarizability obtained by plotting σ max versus C 1/ C 0, where C 1 and C 0 are capacities at full and zero coverage, respectively, is shown to have a definite diagnostic power about the mechanism of adsorption. Some experimental data for Hg and Cd electrodes are discussed in the above context.
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