Akademik Veri Yönetim Sistemi
Diamond and Related Materials, cilt.163, 2026 (SCI-Expanded, Scopus)
Direct and trace level urinary iodide detection is a challenging task. In the present work, a simple and highly sensitive electrochemical detection method has been explored for iodide employing a completely bare AC-1 (BVT) screen printed carbon electrode (SPCE). The specific electrochemical performance of the bare AC-1 electrode was evaluated which showed a superior catalytic response towards iodide detection as compared to the other SPCE. The surface morphology, composition and defects of the bare AC-1 and DS-110 SPCEs was compared through energy dispersive X-ray spectroscopy (EDX), scanning electron microscopy (SEM), and Raman spectroscopy. Compare to DS-110, the AC-1 electrode showed highly porous morphology, greater oxygen to carbon ratio (10:82) and higher intensity ratio (ID/IG = 1.25). Due to the favorable porosity, more oxygenated binding and edge/plane active sites, the electrode exhibited superior electro-catalytic activity towards iodide. These features facilitated the fast electron transfer process which gave rise a lower peak potential separation and a significantly enhance peak current signal for iodide oxidation, as confirmed by cyclic voltammetry. By using a linear sweep cathodic stripping voltammetric (LSCSV) technique, the electrode efficiently accumulated iodide at its surface providing more sensitive response. Under the carefully optimized conditions, the unmodified electrode showed a good linear behavior in the concentration range from 0.32 to 125 μM with a limit of detection (LOD) of 0.075 μM. The sensor demonstrated good repeatability (RSD of 2%) and selective response in the presence of other substances. The method was applied for the direct analysis of iodide in urine sample effectively covering the recommended urinary iodide concentration ranges. The method was also successfully applied to determine iodide in iodate fortified salt sample which showed good percent recoveries. Thus, the low cost bare electrode was found to be a simple alternative to the modified electrodes which can be successfully employed for the routine analysis of iodide in urine and salt samples by providing high sensitivity, selectivity and reproducibility.