Abstract
AbstractThe influence of the parameters of electrochemical pretreatment of carbon fiber electrodes on the differential pulse voltammetric response of bamipine and imipramine is described. Upon increasing the pretreatment potential a slight activation is followed by a deep suppression of peak current in the analysis of both substances. After a turning point the currents rise again and exceed the initial values many times over. The peak potential is affected as well. A slight deactivation is followed by a greater activation. The surfaces were characterized by chronoamperometry, chronopotentiometry and inverse voltammetry of the electrode material. At the carbon fiber epoxy matrix electrode it is possible to distinguish three different stages, which are interpreted as a phase of slightly activating functional groups in a submonolayer, a phase of passivating multilayer oxidation and finally a strongly activating phase of burn‐off and consumption of the electrode surface with change in its structure. These are thought to be responsible for the effects at the surface. It was shown that the effects within the third phase are diametrically opposed for aromatic and aliphatic amines.
Published Version
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