%0 Journal Article
%T Voltammetric Behavior and Amperometric Determination of Ascorbic Acid at Cadmium Pentacyanonitrosylferrate Film Modified GC Electrode
%A H. Razmi and M. Harasi
%J International Journal of Electrochemical Science
%D 2008
%I Electrochemical Science Group
%X The present work, describes electrochemical preparation of a novel cadmium pentacyanonitrosylferrate (CdPCNF) film as a Prussian Blue analogous on the glassy carbon (GC) electrode from a solution of 5 mM CdCl2 and 5 mM Na2[Fe(CN)5NO]. The effect of experimental conditions such as pH and composition of electrodeposition solution on the peak current of the modified electrode and its stability were investigated. In the optimized conditions a controllable and repeatable value of CdPCNF film was obtained. The modified GC electrode showed a reversible cyclic voltammograms due to the redox reaction of Fe(III) / Fe(II) in the film. The CdPCNF film showed a good electrocatalytic activity toward the oxidation of ascorbic acid. The mean value of rate constant k and the diffusion coefficient of ascorbic acid in the solution D, were found to be 3.6 ¡ä 102 M-1 s-1, and 4.4 ¡ä 10-6 cm2 s-1 respectively. A calibration graph was obtained over concentration of 5 ¨C 50 ¦ÌM. The limit of detection was found to be 2.52 ¦ÌM by hydrodynamic amperometry. This technique was used to the selective determination of ascorbic acid in the pharmaceutical preparations and fruit juices.
%K Modified electrode
%K Amperometric determination
%K Ascorbic acid
%K Electrocatalytic oxidation
%K cadmium pentacyanonitrosylferrate
%U www.electrochemsci.org/papers/vol3/3010081.pdf