A New Sensitive Sensor for Simultaneous Differential Pulse Voltammetric Determination of Codeine and Acetaminophen Using a Hydroquinone Derivative and Multiwall Carbon Nanotubes Carbon Paste Electrode

Figure 3

Cyclic voltammograms of HTP-MWCNT-CPE in a 0.15 M phosphate buffer solution (pH 7.0) containing 0.11 mM of codeine at scan rates 2.5, 5, 7.5, and 10 mV s⁻¹. The circles show the part of cyclic voltammograms that was used for deriving Tafel plot. Inset shows the Tafel plots derived from the circled current-potential curve recorded at scan rates of 2.5, 5, 7.5, and 10 mV s⁻¹.