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Preparation of reduced graphene oxide decorated with Cu-Co Oxide Electrode and its application for Sensitive Determination of Nitrite in Food Samples

This study was focused on the electrochemical determination of nitrite in food samples using reduced graphene oxide decorated with Cu-Co oxide nanoparticles (Cu-Co oxide NPs) on a glassy carbon electrode(Cu−Co oxide/rGO/GCE). An electrodeposition technique was used for the modification of the GCE surface with rGO and decoration of the rGO nanosheets with Cu−Co oxide NPs. Morphological and structural analyses using SEM and XRD revealed that rGO nanosheets were electrodeposited on GCE in a typical crumpled and slightly curved structure which provided more active defect sites and a high specific surface area for high porous electrodeposition of Cu−Co oxide NPs. The electrochemical studies using the CV and DPV techniques showed that Cu−Co oxide/rGO/GCE exhibited a sensitive, stable, and selective response to nitrite because of the synergetic effect of Cu−Co oxide NPs and rGO, and the sensitivity, limit of detection and linear range of Cu−Co oxide/rGO/GCE to determination of nitrite were obtained at 0.07436μA/μM, 0.04μM and 100 to 2800μM, respectively. The practicability of Cu−Co oxide/rGO/GCE was investigated in the determination of the nitrite in ham sausage sample, and the results exhibited acceptable values for recoveries (97.42 to 98.65%) and RSDs (3.55 to 4.23%) for the detection of nitrite, indicating to great precision and accuracy in the determination of nitrite content in food samples.