Facile Synthesis of a Novel Zr/Fe 3 O 4 /GO Nanocomposite and Its Application for Modification of Electrode Surfaces and Voltammetric Determination of Nitrite Ions

A ZrNPs/Fe 3 O 4 /GO nanocomposite was successfully synthesized for the first time with an in-situ method, and its properties were defined by energy-dispersive X-ray spectroscopy, scanning electron microscopy, and powder-XRD techniques. Synthesized nanocomposite was then used as a modifier to prepare modified glassy carbon electrodes for the determination of nitrite ions in foodstuffs. Differential pulse voltammetry and cyclic voltammetry studies showed a high catalytic activity of the proposed nanocomposite in nitrite oxidation. In addition, the electrode showed a linear response between 3 and 76 μM, a detection limit of 3 μM, and high selectivity. The synthesized nanocomposite was stable for at least 9 months, and the resultant electrode had similar stability.