Abstract
The method for measurement of differential capacity using a small triangular wave voltage developed by Barker and Faircloth was applied to measurement of differential capacity-time curve during the drop life of mercury electrode adsorbed by surface active substances. The change of relative coverage during the drop life for three kind of adsorbates were calculated from the differential capacity-t1/2 curves. The adsorption process of the adsorbates became clear to be controlled by diffusion. For the case of tribenzylamine, it has been discussed that the adsorption process for early time of a drop life is controlled by diffusion. Using the data of a dependence of relative coverage-time curves on temperature, the activation energy of diffusion of tetrabutylammonium ion, polyvinylalcohol and tribenzylamine has been evaluated on the basis of Koryta's equation.
