DETERMINATION OF TERT-BUTYLHYDROXYTOLUENE BY FLOW-INJECTION ANALYSIS AT POLYMER-MODIFIED GLASSY-CARBON ELECTRODES

A flow injection method for the determination of the antioxidant BHT u sing polymer modified electrodes in connection with amperometric detec tion is proposed. The procedure is based on the electrochemical oxidat ion at 0.700 V (vs. Ag/AgCl[3M NaCl]) in phosphate buffer solution (pH 7.2). BHT is determined over the range 0.001-0.020 or 0.005-0.030 gL( -1). Other analytical parameters, such as electrode working potential, flow rate, electrodeposited charge and solution pH were optimized. Th e proposed method was applied to the determination of BHT in electrica l transformer and vegetable oils samples. The results were compared wi th the HPLC-UV detection standard technique.