Estudos eletrocinéticos na remediação de solo bidimensional: influência do potencial elétrico e do campo elétrico

Abstract

This work shows the results of the behavior of the electric potential and field among two electrodes of a bi-dimensional electrochemical cell built with acrylic with a porous medium distributed uniformly with a solution of a trivalent ion complexed with EDTA. Through an on-line computer aided data acquisition system it was possible to monitor the evolution of the profile of the electric potential within the cell. This work aims at the theoretical and experimental study of the electromigration of metallic ions, being both a basis for and application to the remediation of soils, through the monitoring of the electric field by observing the focalization, electromigration and electro-osmosis phenomena. The results show that, for the electric fields of 10 and 30 V/cm applied between the electrodes, for a period of 30 minutes, there is the electrofocalization in the region of up to 4cm from the anode in which occurs a pH value favorable to the isoelectric point of the trivalent ion. We also noted that the time of focalization is smaller for a larger electric field applied: 7 minutes for the electric field of 30 V/cm and 17 minutes for a field of 10 V/cm.