Estudo do processo adsortivo do complexo Fe-EDTA na superfície do eletrodo de diamante dopado com boro

Abstract

The stripping voltammetry are important electrochemical techniques in trace metals analysis. In current literature there is no study of the adsorptive anodic stripping voltammetry (AdASV) technical for the determination of metal ions, using the Boron Doped Diamond Electrode (BDD). This study aimed to carry out a study on the determination of metals ions in aqueous medium using the BDD electrode with AdASV technique. The supporting electrolyte selected was Britton-Robinson buffer 0,04 mol L-1 , pH (1-11), and EDTA as chelating agent. For the study of adsorptive process on BDD surface the voltammetric behavior of the complex Fe-EDTA was studied. The AdASV methodology was optimized by varying the following parameters: deposition time (Td), deposition potential (Ed), frequency (f) and amplitude (a). After such optimization, a comparative study was carried out concerning the Fe 2+ oxidation process on the surface of BDD electrode in the presence and absence of EDTA. The results show that the Fe-EDTA complex formed performs adsorption on the surface of BDD electrode utilizing procedures and parameters studied in this work. In this way, this optimized methodology can be used for ion Fe 2+ detection in aqueous solution.