Fenômenos eletrocinéticos em meios porosos, aplicação na remediação de solos: influência do pH, condutividade e concentração do contaminante

Abstract

This work presents the results of the electromigration of a trivalent iron ion complexed with EDTA through the profiles of pH, conductivity and concentration distributed in a bi-dimensional electrochemical cell built with acrylic with a porous medium. The analysis procedure was conducted by weigh in order to observe the behavior of the profiles pH, conductivity and concentration parameters, through the electrokinetic phenomena of electromigration and electro-osmosis, as well as the electrofocalization of the ions. The results show that, for independent tests with an electric field of 20 or 30 V/cm applied between the electrodes for a period of 30 minutes occurs the electrofocalization in the area of until 3.5 cm of the anode in which there is a favorable pH value to the isoelectric point of the trivalent ion, between 2.0 and 4.0. We noticed, moreover, that for a same test time, the higher the electric field applied, the higher the concentration of the Fe3+ ion close to the anode will be.