A new voltammetric sensor based on a glassy carbon electrode modified with 8-hydroxyquinoline-5-sulfonic acid

The preparation and characterization of a new modified glassy carbon electrode (GCE) obtained by cycling the potential in 8-hydroxyquinoline-5-sulfonic acid (HQSA) solution is presented. The influence of the deposition parameters on the analytical performance is evaluated along with the comparison with the behaviour of an activated GCE obtained by the same electrochemical treatment but in the absence of HQSA. The modification by HQSA leads to improved electrochemical performances with respect to those of a bare or activated GCE. This is shown by applying the proposed electrode to the determination of some species of pharmaceutical and alimentary interest.