The article is dedicated to the development of a new method for the sulphur-containing compound impurities analysis in mixtures of liquid hydrocarbons and corresponding oil fractions, based on the quenching of CdSe/CdS/ZnS quantum dots photoluminescence effect. The control of quantitative content of such impurities in oil samples is very important for the organization of the processes of its further processing and subsequent wide practical application.
The work uses specially developed methods for the synthesis of CdSe/CDs/ZnS quantum dots, containing a semiconductor core, coated with a composite shell consisting of semiconductor and dielectric layers, as well as a fluorinated polymer porous layer. This technique made it possible to achieve a high quantum yield of photoluminescence (80–90) %, high temporal stability of luminescence in the range of (580–650) nm, as well as good compatibility of quantum dots with liquid hydrocarbon media. For the analysis, a special luminescent sensor was manufactured, which allows measuring the presence of organic sulphur-containing impurities with high sensitivity: (10–5 – 10–4) mg/kg.
The technique is low-cost, allows the use of compact equipment and can be used to conduct operational analysis in real time.
1. Astakhov, A.V. Determination of sulphur compounds in petroleum products [Opredeleniye soyedineniy sery v nefteproduktakh] // Analytics [Analitika], 2022, Vol. 12, # 2, pp. 144–149.
2. Ivanova, L.V., Safieva, R.Z., Koshelev, V.N. IR spectroscopy in the analysis of petroleum and petroleum products // Vestn. Bashkir University [Vestnik Bashkirskogo Universiteta], 2008, Vol. 13, # 4, pp. 869–874.
3. Goganov, A.D. X-ray fluorescence energy dispersive analyzers of light elements based on gas proportional counters [Rentgenofluorestsentnyye energodispersionnyye analizatory legkikh elementov na baze gazovykh proportsional’nykh schetchikov] / Abstracts of the Candidate of Sciences. Diss., St. Petersburg, 2008.
4. Novikov, E.A. Determination of sulphur in petroleum products. Overview of analytical methods // The world of petroleum products, Bulletin of Oil Companies, 2008, # 1–5, pp. 1–39.
5. Kismetova, A. L., Gumarov, M. H., Nurtayeva, J.T. Gilmutdinov, A.T. Methods for the determination of sulphur-containing compounds in oil and petroleum products // Scientific Review [Naychnoe obozrenie], 2012, # 1, pp. 39–43.
6. Goganov, A.D., Korolev, V.V., Kotovich, I.V., Kovalev, V.A., Letyagin, Yu.I., Mistibovskaya L.E., Plotnikov, R.I. Measurement of the mass fraction of sulphur in oil and petroleum products [Izmereniye massovoy doli sery v nefti i nefteproduktakh] / Moscow: World of Measurements, 2004, 39 p.
7. Antipov, E.M., Koryakin, S.L., Maksimova, E. Yu., Pavlov, S.A., Sherstneva, N.E. Features of the formation of the chromaticity of radiation dispersions of cadmium selenide quantum dots/disks/ZNS in multicomponent systems // Light and Engineering, 2017, Vol. 25, # 3, pp. 244–249.
8. Pavlov, S.A., Krikushenko, V.V., Antipov, E.M., Voronets, N.B., Maksimova, E. Yu., Sherstneva, N.E., Koryakin, S.L. Light output and fluorescence efficiency of polymer layers containing colloidal semiconductor phosphors based on cadmium selenide quantum dots/disks/ CNS // Optics and spectroscopy [Optika i spectroskopiya], 2015, Vol. 119, # 2, pp. 153–157.
9. Pavlov, S.A., Pavlov, A.S., Maksimova, E. Yu., Alekseenko, A.V., Pavlov, A.V., Antipov, E.M. Analysis of the luminous field in fluorescent optical layers with quantum dots based on CdSe/CdS/ZnS // Light and Engineering, 2019, Vol. 27, # 5, pp. 82–87.
10. William, Y. V.V., Qu, L., Guo, V., Peng, H. Experimental determination of the extinction coefficient of CdTe, CdSe and CdS nanocr ystals // Chemistry Mater., 2003, Vol. 15, # 14 pp. 2854–2863.
11. Colour in industry / Edited by R. MacDonald, M.: Logos, 2002.
12. Krause, M.M., Musk, T.G., Dzhekhti, L., Moniodis, A., Mooney, J.D., Kambhampati, P. Disclosure of photoluminescence quenching pathways in semiconductor nanocrystals // Chemistry, Physics Lett., 2015, Vol. 633, pp. 65–76.
13. Keizer, J. Nonlinear fluorescence quenching and the origin of positive curvature on Stern-Vollmer graphs // Journal of the American Chemical Society, 1983, Vol. 105, # 6, pp. 1494–1498.

• Previous article
• Next article

• quantum dots
• luminescence
• optical sensors
• transducers
• sulphur-containing compounds
• liquid hydrocarbons
• oil