Simultaneous electrochemical sensing of dihydroxy benzene isomers at cost-effective allura red polymeric film modified glassy carbon electrode

Abstract Background A simple and simultaneous electrochemical sensing platform was fabricated by electropolymerization of allura red on glassy carbon electrode (GCE) for the interference-free detection dihydroxy benzene isomers. Methods The modified working characterized field emission scanning electron microscopy methods. showed excellent electrocatalytic activity electrooxidation catechol (CC) hydroquinone (HQ) at physiological pH 7.4 cyclic voltammetric (CV) differential pulse (DPV) techniques. Results effective split in overlapped oxidation signal CC HQ achieved a binary mixture with peak to separation 0.102 V 0.103 CV DPV kinetics found be adsorption-controlled. potential directly depends buffer solution, it witnessed transfer equal number protons electrons redox phenomenon. Conclusions limit (LOD) calculated 0.126 μM 0.132 linear range 0 80.0 110.0 μM, respectively, ultra-sensitive technique. practical applicability proposed sensor evaluated tap water sample analysis, good recovery rates were observed. Graphical abstract Electrocatalytic interaction ALR/GCE