A direct electrochemical method for the determination of sulfur-containing compounds in motor fuels using copper-modified screen-printed electrodes (Cu-SPCE) and square-wave voltammetry has been developed. The electrode surface was modified by electrodeposition of copper from solutions containing Cu(II) ions. It was shown that the formation of a copper coating leads to an increase in the electrochemically active surface area, a decrease in charge transfer resistance, and an enhancement in the sensitivity of sulfur-containing compound determination. The electrochemical properties of the sensors were investigated using cyclic voltammetry, square-wave voltammetry, electrochemical impedance spectroscopy, SEM, and EDX analysis. The detection limit was found to be approximately 0.05 mmol/L, the correlation coefficients of the calibration plots exceeded R² > 0.99, and the relative determination error did not exceed 10%. The method was successfully applied to the analysis of gasoline samples of various grades and diesel fuel, demonstrating good agreement with the results obtained by ASTM D2622 and potentiometric titration methods.
| Mualliflar | M. I. Ravshanov, С.Д. Аронбаев, Д.М. Аронбаев |
|---|---|
| Jurnal | Samarqand davlat universiteti ilmiy tadqiqotlar axborotnomasi |
| Nashr sanasi | 2026-07-01 |
| Jild | 1 |
| Son | 3 |
| Betlar | 91-101 |
| DOI | 10.59251/2181-3973.2025.v1.138.1.3947 |
DOI: 10.59251/2181-3973.2025.v1.138.1.3947 · Maqolaning asl sahifasi
Addressing the challenges of ambiguity in veterinary medicine, this study proposes a novel approach to cattle disease diagnosis using neutrosophic sets and the Sugeno fuzzy model. The research develops specialized…
Modeling of the adsorption of CH, CH₂, and CH₃ fragments on fullerene C₆₀ was performed. Interatomic interactions were described using a hybrid potential scheme implemented in LAMMPS. The hydrocarbon fragment was…
This study investigates the specific activities of natural (226Ra, 232Th, 40K) and technogenic (137Cs) radionuclides in soils and food products from selected regions of Uzbekistan using scintillation gamma spectrometry…
This paper examines the problem of ensuring the security of information exchange based on the principles of quantum computing. Within the scope of the study, the stages of user authentication, secret-key generation via…
The accelerating urbanization of the Fergana Valley has produced one of the densest settlement systems in Central Asia, yet the agglomerations that anchor this system are habitually examined within national borders, as…
Scientific and methodological foundations for optimal identification, recognition, and classification of single-cell medical objects have been developed using hybrid convolutional neural networks with recurrent…
BaTiO₃-based perovskite materials were synthesized and comprehensively characterized by energy-dispersive X-ray spectroscopy (EDS), Fourier transform infrared spectroscopy (FTIR), and UV–Vis absorption techniques. EDS…
Raman spectra of pure ethyl acetoacetate were obtained at room temperature and atmospheric pressure. The experimental and computational Raman spectra were compared, and PED (Potential Energy Distribution) analyses were…
This paper applies the inverse spectral problem method to integrate the Hirota equation with an additional term and a finite density within the class of periodic infinite-gap functions. The evolution of the spectral…
With a high spectral resolution of 0.1 cm⁻¹, the (CH3)2O···HF complex's gas phase infrared absorption spectra were recorded at temperatures between 188 in the 3200–3800 cm⁻¹ range, which corresponds to the HF stretching…
Samarqand davlat universiteti ilmiy tadqiqotlar axborotnomasi — barcha maqolalar