Figure 2: (I) Cyclic voltammograms and (II) square wave voltammograms of 1000 ng/mL of mefenamic acid at various pH values (right to left); 3, 4, 5, 6 and 7, scan rate: 80 mV/s at MWCNTs-G/Ag electrode. Inset is the relationship between pH values and anodic peak potentials.