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Nitrite salts, commonly used as food preservatives, inhibit bacterial growth and are present in water from runoff, industrial discharges, and decay. Elevated nitrite levels in the human body pose health risks, including methemoglobinemia, gastric, and esophageal cancers. Moreover, high nitrite levels in water bodies can adversely impact ecosystems and aquatic life. This research explored the utilization of Ag-doped TiO2 in a screen-printed electrode for nitrite detection, synthesized through the solution combustion method. X-ray diffraction and X-ray absorption near-edge structure (XANES) techniques revealed that the synthesized nanoparticulate powders were pre-dominantly composed of anatase, with minor amounts of brookite. The electrochemi-cal activity of the sensing materials was assessed using cyclic voltammetry in the presence of sodium nitrite solutions spanning concentrations from 0.001 mM to 1 mM. A significant reduction reaction of the screen-printed electrode consisting of 3 mol% Ag-doped TiO2/MWCNTs was observed at an applied voltage close to -0.13 V. The electrode exhibited excellent sensitivities and a low detection limit, along with decent selectivity in the presence of other interfering chemical species in water. The experimental results provided strong evidence for the capability of Ag-doped TiO2 to be utilized as a key element in intelligent sensing devices.
