INTERACTIONS BETWEEN OH− IONS AND SOIL SURFACES: A KINETIC STUDY

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Abstract
A kinetic study, regarding the interactions between OH− ions and soil surfaces, was carried out in order to investigate the nature of the process, and calculate its specific rate. A two-step process took place when initial OH− ion activities were sufficiently high. A first rapid step was always followed by a relatively less rapid step. The two steps were ascribed to the interaction of OH− ions with external and internal soil surfaces, respectively. Experimental data fitted a pseudo-first-order kinetic equation very well over the time period examined, so that the values of the specific rate were calculated at different initial NaOH concentrations. Since a decrease of the specific rate was observed when the initial OH− ion activity was increased a diffusion-controlled mechanism was postulated to regulate the rate of the process. The change of the specific rate as a function of the supporting electrolyte concentration was also investigated. Key words: Deprotonation kinetics, permanent charge, pH-dependent charge, diffuse double layer

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