In-situ polymerization of meta nitro benzoic acid on graphite electrode as a mediator for the electrochemical oxidation of resorcinol

We have fabricated a novel disposable and cost-effective pencil graphite electrode for the voltammetric analysis of the organic water pollutant resorcinol. This method of quantification of resorcinol can be recommended as an effortless and precise way for the voltammetric determination of resorcinol in water samples. The sensor was found to be selective yet easily accessible with the less expensive method. Here, we developed a pencil graphite electrode modified with 3-nitro benzoic acid as the sensor material for the determination of resorcinol. The fabricated sensor is used for the elevated level quantification of resorcinol in well and tap water samples. The easiness of the analytical method, the high sensitivity, 3.75 μA/μM/cm 2 , and the linear concentration range (1-300 μM) of resorcinol on the proposed sensor are discerned to be higher than previously published electrochemical sensors. The selectivity of resorcinol from various interfering molecules is known to be excellent, especially the isomers catechol and hydroquinone with a low detection limit of 0.16 μM.