Interference free detection of dihydroxybenzene isomers at pyrogallol film coated electrode: A voltammetric method

A carbon paste electrode was modified with pyrogallol red film using a cyclic voltammetric method (CV) and the influence of number of sweep segments on the surface area of was examined. The fabricated film coated electrode exhibited excellent electrocatalytic performance for the electro-oxidation of 1, 2- dihydroxybenzene and 1, 4-dihydroxybenzene. To know the kinetics of electrode process, scan rate study was conducted and it confirms the adsorption controlled electrode kinetics. The redox potentials were dependents on pH and witnessed an identical number transfer of protons and electrons. Also a linearity was observed for the peak current and concentration of both HQ and CC by using differential pulse voltammetric technique (DPV) and gave a detection limit of 0.018 and 0.021 mu M respectively. Furthermore, successful selective separation of phenolic isomers was achieved in a binary mixture. A good analytical results were observed towards the quantification of CC and HQ in a tap water sample.