Electrokinetic evaluation of the buffer capacity of soils

 

F. Hernández-Luis,^a,* D. Grandoso,^a M. Lemus,^a D. Benjumea,^a

C.D. Arbelo,^b D. Naranjo,^c M.V. Vázquez^c

^aDepartamento de Química Física, Universidad de La Laguna, Tenerife, España

^bDepartamento de Edafología y Geología, Universidad de La Laguna, Tenerife, España

^cGrupo de Electroquímica, Instituto de Química, Facultad de Ciencias Exactas y Naturales, Universidad de Antioquia, AA. 1226, Medellín, Colombia

 

Abstract

Based on the principles of the technique of electroremediation (electrochemical decontamination), experiments were carried out with the purpose to determine the buffer capacity of two soils from the region of Antioquia, Colombia, using a new method. These studies included the analysis of variation of the conductivity and residual pH in selected soils, after application of an electric field. From the different obtained parameters a function was defined combining the values of pH in zones close to the cathodic chamber with the corresponding one to the blank. This function allows obtaining a measurement of the buffer capacity of the soils. In this case the function represents the easiness for changing the pH when the electric field is applied and therefore it would not only have agricultural utility, but also to evaluate the behaviour in the case of a electrochemical decontamination treatment. The observed variations in the function are in agreement with those obtained when acid or bases solutions are added to soils.

Keywords: lectrocharacterization, electroremediation, soils, pH, conductivity.

 

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*Corresponding author. E-mail address: ffhelu@ull.es