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Figure 4: Effect of pH on the differential pulse voltammogram peak currents of oxidations of DA and PAR compounds at MWCNTs/GCE in phosphate buffer solutions. Concentrations: DA: 200 μM and PAR: 200 μM. Insets: (A) plot of peak potential as a function of pH for DA. (B) Plot of peak potential as a function of pH for PAR.