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Abstract
In this work we studied the electrochemical behavior of a glassy carbon electrode modified with natural and synthetic zeolites. Iron exchanged zeolites were set up for the detection of arsenic species. The electrochemical response both in KCl and HCl 0.1 M of the electrodes after modification was investigated by cyclic and differential pulse voltammetry. The electrochemical parameters of the redox pairs Fe3+/Fe2+ and Fe2+/Fe0 were determined for the iron containing electrode and the effect of repetitive potential cycling on the formation of iron oxides was studied. The reactivity of the exchanged iron species in the zeolite and the reduction of the complex As(V)-iron generated in-situ could be demonstrated.
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