Electrochemical detection of nitrite using screen printed graphite electrode modified by ION/rGO

Abstract

In this work, an electrochemical sensor based on iron oxide-reduced graphene oxide nanocomposite screen printed graphite electrode (ION-rGO) has been developed for selective detection of nitrite ions in drinking water using differential pulse voltammetry (DPV). The proposed nitrite electrochemical sensor exhibited a relative standard deviation of 4.37% for three replicate analysis of 10 ^-3 mol L ^-1 NO ₂ . In addition, the fabricated sensor has been successfully employed for determining the NO ₂ displays high electrochemical stability for NO ₂ oxidation over the pH 6.5, high sensitivity and low limit of detection of 1.2 × 10 ^-4 mol L ^-1 with good selectivity, stability, and reproducibility. These results demonstrate that the facile metal oxide-rGO-modified electrochemical sensor has promising applications for the determination of nitrite in water.