OPTIMIZATION OF BUFFER CONDITIONS FOR THE CYCLIC VOLTAMMETRIC DETERMINATION OF Co(II) IONS

In this study, the effect of supporting electrolytes on the determination of Co(II) ions in the presence of o-nitrosophenol was investigated using cyclic voltammetry. Experiments were carried out at a silver/mercury amalgam working electrode versus Ag/AgCl. The influence of different types of supporting electrolytes, including acetate, phos-phate, and nitrate buffer systems, as well as their pH values, on the formation of the Co(II)–o-nitrosophenol complex was systematically evaluated. The results demonstrated that both the type of supporting electrolyte and the acidity of the medium significantly affect the peak current and peak potential. The highest sensitivity and the most stable voltammetric response were observed in acetate buffer at pH 5.1. Under these conditions, the detection limit of Co(II) was minimized, and repeatability showed high accuracy. These findings indicate that the proper selection of supporting electrolyte is a critical factor in enhancing the sensitivity and selectivity of Co(II) ion determination by electrochemical methods.

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