Flow injection analysis of BHA by NiHCF modified electrode

Flow injection method is described for the determination of the antioxidant tert-butylhydroxy anisole (BHA) based on its catalytic oxidation at a nickel hexacyanoferrate (NiHCF) surface modified graphite wax composite electrode fabricated using a new approach. The electrochemical characteristics of the modified electrode were studied using cyclic voltammetry. The voltammetric response of BHA at the modified electrode showed current densities remarkably higher than the bare graphite electrode and occurred at a reduced over voltage of 200 mV. Linear calibration graphs were obtained in the range of 1.2 x 10(-6) -1.07 x 10(-3) M. A detection limit of 6 x 10(-7) M was obtained with a correlation coefficient of 0.9983 based on S/N = 3. Reliable results were obtained by applying the proposed flow injection method to determine BHA spiked in dehydrated potato flakes. Results suggest that the developed method can be effectively employed for the determination of BHA from food samples. (C) 2009 Published by Elsevier Ltd.