Interference Free Simultaneous Detection of Dihydroxy Benzene Isomers at Cost-effective and Reliable Celestine Blue Modified Glassy Carbon Electrode

摘要

A successful cyclic voltammetric electropolymerisation and electrochemical characterization of celestine blue (CB) was achieved on glassy carbon electrode (GCE). The fabricated electrode was then used for the electroanalysis of hydro- quinone (HQ) and catechol (CC). Due to the improved electro- catalytic activity of the fabricated electrode, an interference free simultaneous detection of CC by HQ was observed. The scan rate studies suggest the diffusion-controlled kinetics phenomenon at the modified electrode. Concentration studies, yielding a limit of detection (LoD) of 0.0491 μM and 0.0456 μM for CC and HQ respectively in the first linear range of 0 to 40 μM, limit of detection of 0.0621 μM and 0.0638 μM for CC and HQ respectively in the second linear range of 50 to 120 μM, which were relatively lower as compared to previous reports was achieved by using differential pulse voltammetry (DPV). In order to evaluate the analytical performance of the CB/GCE, tap water sample analysis was carried out and good recovery results were obtained.