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New Analysis of tert-Butanol Adsorption Data on a Mercury Electrode: The Electrocapillary Measurements

“…Row III in the table shows, for a comparison, five main parameters of the model of two parallel capacitors, which we found for the TB adsorption on mercury by using the regression analysis procedure described in [13,14]. In this case, the root-mean-square deviation [(C exp -C theor )/C exp ] 2 × 100% is 14.7%.…”

New Analysis of Data on the Differential Capacitance of a Mercury Electrode during the Adsorption of tert-Butanol

“…As is shown by the results of application of a method of regression analysis of differential-capacitance curves to a number of simple organic compounds that undergo adsorption on various metallic electrodes [9,10,14], in the majority of cases it happens to be enough to take into account the linear dependence of the parameter of an intermolecular interaction ‡ , which enters the equation of the Frumkin isotherm [3] (1) on the electrode potential E . In formula (1), c is the concentration of the organic substance that undergoes adsorption, θ is the coverage of the electrode surface by this organic substance, and β is a potential-dependent constant of an adsorption interaction.…”

“…It was of interest to compare regression methods of analysis of ECC and curves of differential capacitance [9][10][11] using, as an example, the same compound. Such a possibility is offered by the data concerning the adsorption of tert-butanol on a mercury electrode [12], which in the form of tabulated values of an interfacial tension and a differential capacitance are presented in reference publication [13].…”

Regression technique for analyzing electrocapillary curves

“…In [1,2], we proposed a technique for the determination of adsorption parameters of simple organic substances, which is based on a regression analysis of equilibrium [1] and nonequilibrium [2] dependences of the differential capacitance C on the electrode potential. In doing so, we assumed that the adsorption of these substances is described by the Frumkin isotherm [3] (1) and the dependence of the adsorption equilibrium constant β on the electrode potential follows the model of two parallel capacitors [4,5], according to which (2) In Eqs.…”

“…In doing so, we assumed that the adsorption of these substances is described by the Frumkin isotherm [3] (1) and the dependence of the adsorption equilibrium constant β on the electrode potential follows the model of two parallel capacitors [4,5], according to which (2) In Eqs. (1) and (2), θ is the surface coverage by organic substance molecules; c is its bulk concentration; E 0 is the electrode potential referred to the potential of zero charge (PZC) in a pure surface-inactive supporting electrolyte; β 0 is the value of β at E 0 = 0; E N is the PZC shift at transition from θ = 0 to θ = 1; C 1 is the electrical double layer capacitance at θ = 1; ∆σ 0 is the decrease in the interface tension in a pure supporting electrolyte upon the transition from E 0 = 0 to a given E 0 value; A = RT Γ m , where Γ m is the surface concentration of the organic substance at θ = 1; and R and T have their usual meaning.…”