Theoretical description of the ligand function for ionoselective electrodes reversible to metal anion complexes. 1. Lower detection limit and its determining factors

Authors

  • Vladimir V. Egorov Belarusian State University, 4 Niezaliežnasci Avenue, Minsk 220030, Belarus; Research Institute for Physical Chemical Problems, Belarusian State University, 14 Lieninhradskaja Street, Minsk 220006, Belarus https://orcid.org/0000-0001-9414-0423
  • Andrei V. Semenov Research Institute for Physical Chemical Problems, Belarusian State University, 14 Lieninhradskaja Street, Minsk 220006, Belarus https://orcid.org/0000-0002-6478-0435
  • Andrei D. Novakovskii Belarusian State University, 4 Niezaliežnasci Avenue, Minsk 220030, Belarus; Research Institute for Physical Chemical Problems, Belarusian State University, 14 Lieninhradskaja Street, Minsk 220006, Belarus
  • Yauhen B. Akayeu Research Institute for Physical Chemical Problems, Belarusian State University, 14 Lieninhradskaja Street, Minsk 220006, Belarus https://orcid.org/0000-0002-6377-1975

Keywords:

tetrathiocyanatozincate selective electrode, ligand function, lower detection limit, diffusion model
Supporting Agencies
This work was supported by the Ministry of Education of the Republic of Belarus (project No. 20190746).

Abstract

Within the framework of the steady-state diffusion model, the theoretical description for the thiocyanate ion lower detection limit (LDL) by the tetrathiocyanatozincate selective electrode, has been presented. The main assumptions of this model are constancy of the ion exchanger concentration along the membrane, traditionally used in various phaseboundary potential diffusion models, and linear profiles of components’ concentrations in diffusion layers. Simple quantitative expressions have been obtained, connecting thiocyanate ion concentration in the solution surface layer (responsible for LDL value) with phase boundary extraction equilibria constants, stability constants for zinc thiocyanate complexes, and diffusion parameters in the membrane and solution phases. Calculated LDL values are in good agreement with experimental data provided in the literature. It has been shown that LDL can be reduced substantially by controlling such easily regulated diffusion parameters as diffusion layer thickness in the membrane phase, which is a function of time, and diffusion layer thickness of the sample solution, which is governed by stirring regime.

Author Biographies

  • Vladimir V. Egorov, Belarusian State University, 4 Niezaliežnasci Avenue, Minsk 220030, Belarus; Research Institute for Physical Chemical Problems, Belarusian State University, 14 Lieninhradskaja Street, Minsk 220006, Belarus

    doctor of science (chemistry), full professor; professor at the department of analytical chemistry, faculty of chemistry

  • Andrei V. Semenov, Research Institute for Physical Chemical Problems, Belarusian State University, 14 Lieninhradskaja Street, Minsk 220006, Belarus

    junior researcher at the laboratory of physico-chemical methods of investigation

  • Andrei D. Novakovskii, Belarusian State University, 4 Niezaliežnasci Avenue, Minsk 220030, Belarus; Research Institute for Physical Chemical Problems, Belarusian State University, 14 Lieninhradskaja Street, Minsk 220006, Belarus

    senior lecturer at the department of analytical chemistry, faculty of chemistry, Belarusian State University, and junior researcher at the laboratory of physico-chemical methods of investigation, Research Institute for Physical Chemical Problems, Belarusian State University

  • Yauhen B. Akayeu, Research Institute for Physical Chemical Problems, Belarusian State University, 14 Lieninhradskaja Street, Minsk 220006, Belarus

    PhD (chemistry), docent; associate professor at the department of analytical chemistry, faculty of chemistry

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2020-08-28

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No. 2 (2020): Journal of the Belarusian State University. Chemistry

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How to Cite

[1]
Egorov, V.V. et al. 2020. Theoretical description of the ligand function for ionoselective electrodes reversible to metal anion complexes. 1. Lower detection limit and its determining factors. Journal of the Belarusian State University. Chemistry. 2 (Aug. 2020), 17–28. DOI:https://doi.org/10.33581/2520-257X-2020-2-17-28.