The electrochemical behavior of iron(III) incorporated in zeolite Y-modified electrode and the catalytic oxidation of ascorbic acid

摘要: A new method is developed for the catalytic oxidation of ascorbic acid (AA) at a graphite-zeolite-modified electrode doped with iron(III) (Fe3+Y/ZCME), in which exchanged zeolite Y can act as catalyst to oxidize AA. First, electrochemical behavior incorporated Y-modified was studied. The results illustrate that diffusion controls ferric/ferrous redox process Fe3+Y/ZCME. anodic current this increases supporting electrolyte concentration non-size-excluded cation and suppressed when using size-excluded cation. Second, AA explored With constant potential amperometric measurements optimal conditions determination were obtained. working 0.55 V (vs. SCE); 0.1 M KNO3Or 0.05 M Na2HPO4-KH2PO4buffer solution (pH 6.8). response exhibits linear relationship over range 1.58×10–6–2.15×10–2 M. When samples urine, fruit analyzed Fe3+Y/ZCME, we obtained recovery 98–102%, relative standard deviation lower than 3%. Meanwhile, interferences from other ions organic substances examined.