Fig. 5. Nyquist plot at opPy/AumTs/Pt electrode in solutions of interferents and 2 mM H2O2 in phosphate buffer at pH 7 0.1 M: (a) uric AGN 195183 4 mM, (b) ascorbic acid 4 mM, (c) acetaminophen 4 mM, (d) H2O2 2 mM, (e) solution containing H2O2 and all the interferences. Frequency range: 10 kHz to 0.1 Hz; signal amplitude 10 mV; OCV conditions.Figure optionsDownload full-size imageDownload as PowerPoint slide
The presence of the most common interferents does not induce a similar impedance response at modified electrode (Fig. 5). This is a quite encouraging result because the overcoming of the simultaneous oxidative reactions (H2O2 and interferents) is a goal in the sensor field, especially for the devices working in the very low concentration range.
Furthermore, considering the extended linearity range and the concentrations involved, a possible application field is the determination of strong oxidants at high concentration in particular environmental context .