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This dissertation describes the use of flow electroanalytical techniques to study the adsorption of Cd(II), Pb(II) and Cu(II) onto vermiculite aiming an alternative treatment of wastewater from coatings industry. The study indicated that under pH range from 4 to 6 there is no difference on using expanded or not expanded vermiculite for removal of ions. It was also observed that at any evaluated pH, a 180 minutes interaction time was long enough to allow the system reach equilibrium. It’s possible to state that non-expanded vermiculite presents the following affinity orders by the studied ions: pH 4: Cu(II) < Cd(II) < Pb(II); pH 5: Cu(II) Cd(II) < Pb(II); pH 6: Cd(II) < Cu(II) < Pb(II). At working conditions, tests involving vermiculite columns didn’t show a better performance on extracting these ions when faced to batch extraction systems. Extraction percentuals of about 76% were obtained using a sample of coatings industry wastewater, reinforcing the viability of the use of vermiculite as an adsorbent of these metals. A SIA-ASV (sequential injection analysis – anodic stripping voltammetry) method was proposed and validated. For a deposition time of 80 s and a flow rate of 10 μL s, detection limits were 0.06, 0.09 and 0.16 μmol L to Cd, Pb and Cu, respectively; a linear working range, between 0.2 and 9.0 μmol L was also determined.

Uso de técnicas eletroanalíticas em fluxo no estudo da adsorção de Cd(II), Pb(II) e Cu(II) em vermiculita visando tratamento alternativo para efluentes da indústria de tintas