Determination of Dopamine Using Poly(p-nitrobenzenazo resorcinol) Modified Glassy Carbon Electrode with Cyclic Voltammetric Method

The electrochemical behavior of dopamine (DA) on poly(p-nitrobenzenazo resorcinol)(NBAR) film modified electrode was studied by cyclic voltammetry(CV), while the determination of DA was measured by differential pulse voltammetry (DPV). It was found that the modified electrode showed excellent electrocatalytic characteristics for DA. In pH 4.0 phosphate buffer solution, the relationship between oxidation peak current and the concentration of DA is linear in the range of 5.0×10-6～8.0×10-4mol/L. The detection limit is 6.0×10-7 mol/L. The interference of other components could be efficiently eliminated on the modified electrode. This method can be used for the determination of DA in real sample with satisfactory results.