Abstract
CZU 543.552.054.1:546.48
DOI https://doi.org/10.52577/eom.2026.62.2.29
This study demonstrates the applicability of the anodic stripping voltammetry (ASV) method using electrodes based on nanostructured titanium dioxide films modified with yttrium-doped titanium dioxide (Y–TiO₂) for the detection of cadmium ions (Cd²⁺) in liquid media. X-ray diffraction and scanning electron microscopy analyses confirmed the formation of uniform nanostructured TiO₂ films with improved electrochemical properties. It was shown that yttrium modification enhances the catalytic activity of TiO₂-based electrodes in the determination of cadmium ions by the ASV and increases the sensitivity of the Cd²⁺ analytical signal. The conditions for the electrochemical determination of Cd²⁺ ions were optimized, including the electrode composition, supporting electrolyte composition, preconcentration time, and potential. The effect of interfering ions (Cu²⁺, Pb²⁺, Zn²⁺, Na⁺, and K⁺) on the analytical signal of cadmium was also investigated. A linear dependence of the analytical signal on the cadmium ion concentration was established in the range of 0.003–8 mg∙L⁻¹, with a detection limit of 0.003 mg∙L⁻¹ and a relative error of 5%. The obtained results indicate the promising potential of nanostructured Y–TiO₂ electrodes for the development of highly sensitive and selective electrochemical sensors for monitoring toxic metal content in liquid media.
Keywords: stripping voltammetry, titanium dioxide, yttrium, nanostructured films, cadmium, electrochemical sensor, toxic metals.