Voltammetric Determination of Codeine on Glassy Carbon Electrode Modified with Nafion/MWCNTs

Figure 3

Dependence of the peak current on pulse amplitude in the range of 10 to 100 mV and step potential in the range of 1 to 7 mV for 10 μM codeine in 0.1 M phosphate buffer (pH 3.0) volume of Nafion/MWCNTs 10 μL. Other instrumental parameters: , = 20 ms, preconcentration potential 300 mV, preconcentration time 20 s, and stirring rate 500 rpm.