The effect of scan rate on the anodic peak current for oxidation of dopamine at iodine-coated platinum electrode. A. Cyclic voltammograms of dopamine electrooxidation at iodine-coated electrode in 0.1 M PBS (pH 7) solution containing 1.00 mM dopamine. Scan rate = 100 mV/s B. A plot of anodic peak current vs. (scan Rate)1/2, where n is the scan rate of the recorded voltammograms in (A).