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In the present work, a polymeric thin layer that is poly(nigrosine) modified carbon paste electrode (PNMCPE) was established for the electrochemical analysis of catechol (CC) and hydroquinone (HQ) simultaneously and individually by using cyclic voltammetric (CV) technique. The PNMCPE shows a great electrocatalytic activity towards the oxidation of CC and HQ in phosphate buffer solution (PBS) of pH 7.4 than the BCPE. All experimental parameters are studied such as scan rate effect, effect of concentration, stability and interference study. With these studies optimised result was obtained at PNMCPE. The limit of detection (LOD) of CC and HQ was found to be 1.917 µM and 1.902 µM. and limit of quantification (LOQ) of CC and HQ was found to be 6.39 µM and 6.34 µM. The real sample analysis was successfully applied in tap water sample with a satisfactory recovery. Ultimately, this method can be used for the development of electrochemical sensor for sensitive analysis of CC and HQ.

Electrochemical studies of catechol and hydroquinone at poly(nigrosine) modified carbon paste electrode: a cyclic voltammetric study