Ion-selective electrodes based on chalcogenide film membranes for determining the cadmium content in aquas solutions
https://doi.org/10.21266/2079-4304.2024.248.291-303
Abstract
Ion-selective electrode membranes made from chalcogenide glassy semiconductors have valuable analytical and practical characteristics, such as a low detection limit of metal cations in aqueous solutions, reproducibility of electrode function, short response time of the analytical signal, miniaturization of sensors, and the ability to automate measurements. CdI2-PbI2-As2Se3 glasses were synthesized using the reagents cadmium iodide, chemically pure lead iodide, and special purity arsenic triselenide. Glasses were synthesized at a maximum temperature of 1000 °C in evacuated quartz ampoules with a residual pressure of 10–4 Pa. When the temperature reached 1000 °C, the ampoules with the charge melt were kept for 4– 6 hours with constant stirring, then the melt was quenched in water with ice. CdI2- PbI2-As2Se3 films were deposited from solutions of glasses in n-butylamine. For the first time, potentiometric chemical sensors based on CdI2-PbI2-As2Se3 chalcogenide membranes containing metal iodides have been obtained for direct determination of the molar concentration of cadmium cations in aqueous solutions. It has been established that the electrode properties of the resulting film and glass Cd-ISEs depend mainly on the content of cadmium iodide in the membranes, and the ratio of components in the chalcogenide matrix (lead iodide and arsenic selenide) affects mainly the electrode functions of the sensors. The parameters and dependence of electrical conductivity on temperature, as well as electrode properties in the CdI2- PbI2-As2Se3 system are determined by the composition of the amorphous material and do not depend on the production method (glass or chemically deposited film from a glass solution).
About the Authors
D. L. Baidakov
St.Petersburg State Forest Technical University
Russian Federation
Russian Federation
Baidakov Dmitry L. – DSs (Chemistry), Assistant professor,
194021. Institute per. 5. St. Petersburg
A. V. Sheloumov
St.Petersburg State Forest Technical University
Russian Federation
Russian Federation
Sheloumov Andrey V. – DCs (Thecnical), Professor,
194021. Institute per. 5. St. Petersburg
N. V. Michailova
Federal State Budgetary Institution Scientific Research Center named after V.A. Almazova
Russian Federation
Russian Federation
Michailova Ninel V. – DCs (Chemistry), Assistant professor, Faculty of Medicine, Institute of Medical Education,
197341. Kolomyazhsky av. 5. St. Petersburg
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Review
For citations:
Baidakov D.L., Sheloumov A.V., Michailova N.V. Ion-selective electrodes based on chalcogenide film membranes for determining the cadmium content in aquas solutions. Izvestia Sankt-Peterburgskoj lesotehniceskoj akademii. 2024;(248):291-303. (In Russ.) https://doi.org/10.21266/2079-4304.2024.248.291-303
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