Keywords
differential sensors
conductometric biosensors
impedance parameters
equivalent electrical circuit
How to Cite
Abstract
A method for measuring local changes in the electrical conductivity of solutions using differential conductometric sensors is considered. The method makes it possible to significantly reduce the measurement error due to changes in the background electrical conductivity of the measuring medium when applying the test substance with non-identical parameters of equivalent electrical circuits of the sensor components. The bridge measuring circuit is brought to a quasi-balanced state, while the voltages in the sections of the working solution of the working and reference transducers of the sensor coincide in phase with each other, and their values are proportional to the conductivity of these sections. At the same time, changes in the background electrical conductivity of the solution do not lead to a change in the imbalance signal of the bridge circuit, which allows measuring the informative local change in the electrical conductivity of the working transducer with high sensitivity. The method can be used for highly sensitive and accurate quantification of solutions of electrically conductive substances in technological processes in the energy, chemical, and food industries, in the latest technologies, in particular in biosensor analyzers. The research results of the experimental sample of the conductometric analyzer are given. Ref. 9, table.
References
Turner A.P.F., Karube I., Wilson G.S. Biosensors: Fundamentals and applications. New York: Oxford Univer-sity Press, 1987. 770 p. DOI: https://doi.org/10.1016/S0003-2670(00)85361-1
Brett C.M.A., Brett A.M.O. Electrochemistry – Principles, methods and applications. Oxford University Press, 1993. 427 p.
Impedance Spectroscopy. Theory, Experiment, and Application. Edited by Barsoukov E., Macdonald J.R. New Jersey: John Wiley & Sons Inc., 2005. 595 p. DOI: https://doi.org/10.1002/0471716243.
Grossi M., Riccò B. Electrical impedance spectroscopy (EIS) for biological analysis and food characterization: a review. Journal of Sensors and Sensor Systems. 2017. No 6. Pp. 303-325. https://doi.org/10.5194/jsss-6-303-2017.
Kolahchi N., Braiek M., Ebrahimipour G., Ranaei-Siadat S., Lagarde F., Jaffrezic-Renault N. Direct detection of phenol using a new bacterial strain-based conductometric biosensor. Journal of Environmental Chemical Engineer-ing. 2018. Vol. 6. Iss. 3. Pp. 478-484. DOI: https://doi.org/10.1016/j.jece.2017.12.023.
Lee R., Kester W. Fully Automatic Self-Calibrated Conductivity Measurement System. Analog Dialogue, 50-11. 2016.
Melnyk V.G., Dzyadevych S.V., Novik A.I., Pogrebnyak V.D., Slitskiy A.V., Lepikh Ya.I., Lenkov S.V., Procenko V.O. Ensuring of reliability of metrological characteristics of the conductometric systems with differential sensors. Sensorna elektronika i mikrosystemni tekhnologii. 2011. Vol. 8. No 4. Pp. 46-52. (Rus). DOI: https://doi.org/10.18524/1815-7459.2011.4.119304.
Melnyk V.G., Slitskiy A.V., Vasylenko A.D. The quasi balanced conductometric bridge for biosensor system with balancing modulus and phase. Sensorna elektronika i mikrosystemni tekhnologii. 2016. Vol. 13. No 3. Pp. 91-100. (Rus). DOI: https://doi.org/10.18524/1815-7459.2016.3.78649.
Melnyk V.G., Borshchov P.I., Dzyadevych S.V., Saiapina O.Y., Vasylenko O.D. Increasing the sensitivity and metrological reliability of a differential conductometric biosensor system. Tecknichna electrodynamika. 2021. No 6. Pp. 68-77. DOI: https://doi.org/10.15407/techned2021.06.068
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Copyright (c) 2022 V.G. Melnik, P.I. Borshchov, S.V. Dzyadevych, O.Y. Saiapina