Zirconia/Poly(oxalic acid) Modified Carbon Paste Electrode for Electrochemical Investigation of Uric Acid in Presence of Dopamine and Ascorbic Acid

摘要

The electrochemistry of uric acid in the presence of dopamine and ascorbic acid was studied by cyclic voltammetry at a carbon paste electrode modified with zirconia and oxalic acid to get zirconia/poly(oxalic acid) modified carbon paste electrode (ZrO2/POA/CPE), The modified electrode could resolve well the anodic peaks of uric acid, dopamine and ascorbic acid and also showed far better sensitivity for uric acid (two folds) compared to bare carbon paste electrode. Scan rate studies indicated that the electrode process was both diffusion and adsorption controlled.