Theoretical description of the ligand function for ionoselective electrodes reversible to metal anion complexes. 3. Modeling of the electrode response in ligand and foreign ions solutions using the multi-species approach model

  • 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
  • Andrei V. Siamionau Belarusian State University, 4 Niezaliežnasci Avenue, Minsk 220030, Belarus; Research Institute for Physical Chemical Problems, Belarusian State University, 14 Lieninhradskaja Street, Minsk 220006, Belarus
  • 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 Belarusian State University, 4 Niezaliežnasci Avenue, Minsk 220030, Belarus https://orcid.org/0000-0002-6377-1975
DOI: https://doi.org/10.33581/2520-257X-2021-1-36-49

Abstract

A description for the ligand function of the tetrathiocyanatozincate selective electrode, has been proposed, using a multi-species approach model. This model takes into account simultaneous phase-boundary, diffusion-controlled, processes of ion exchange between tetrathiocyanatozincate, thyocyanate and foreign ions unable to form zinc complexes, as well as distribution of the neutral zinc complex between phases, partial decomposition of quaternary ammonium tetrathiocyanatozincate salt and stepwise complex formation processes in water phase. The model is based on solving the system of equations describing several interphase and intraphase equilibria, assuming that diffusion flows of all membrane and solution components at the phase boundary are stationary. It provides the adequate description of tetrathiocyanatozincate selective electrode in solutions of the ligand, foreign ions and mixed solutions of the above, and predicts the effect of zinc chloride concentration in the sample solution upon electrode function slopes, lower detection limits and selectivity coefficients.

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, Belarusian State University , and chief researcher at the laboratory of physicochemical methods of investigation, Research Institute for Physical Chemical Problems, Belarusian State University

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

postgraduate student 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

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, Belarusian State University, 4 Niezaliežnasci Avenue, Minsk 220030, Belarus

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

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Published
2021-04-12
Keywords: tetrathiocyanatozincate selective electrode, multi-species approach model, ligand function, lower detection limit, response slope, selectivity coefficients
Supporting Agencies This work was supported by the Ministry of Education of the Republic of Belarus (project No. 20190746).
How to Cite
Egorov, V. V., Siamionau, A. V., Novakovskii, A. D., & Akayeu, Y. B. (2021). Theoretical description of the ligand function for ionoselective electrodes reversible to metal anion complexes. 3. Modeling of the electrode response in ligand and foreign ions solutions using the multi-species approach model. Journal of the Belarusian State University. Chemistry, 1, 36-49. https://doi.org/10.33581/2520-257X-2021-1-36-49
Issue
No 1 (2021): Journal of the Belarusian State University. Chemistry
Section
Original Articles

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