Voltammetric Detection of Dopamine in Presence of Ascorbic Acid and Uric Acid at Poly (Xylenol Orange) Film-Coated Graphite Pencil Electrode

Figure 6

(a) Differential pulse voltammograms of different concentrationof DA (a–g; 0.2, 0.3, 0.4, 0.5, 0.5, 0.6, 0.7, 0.8 and 0.9×10⁻⁵ M in 0.2 M phosphate buffer solution of pH 7.0 in the presence of 1×10⁻³ M AA, and 5×10⁻⁴ M UA at poly(XO)/GPE. (b) Graph of anodic peak current versus different concentration of DA.

(a)

(b)