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Please use this identifier to cite or link to this item: https://elib.bsu.by/handle/123456789/261447
Title: Overcoming of One More Pitfall in Boundary Element Calculations with Computer Simulations of Ion-Selective Electrode Response
Authors: Egorov, V.V.
Novakovskii, A.D.
Issue Date: 2019
Publisher: American Chemical Society
Citation: ACS Omega 2019;4(1):1617-1622.
Abstract: Computer simulations of ion-selective membrane electrodes using diffusion layer models based on finite-differences principle for calculating diffusion processes in both phases and taking into account the local ion exchange equilibrium at the interface are successfully used for clarifying and even predicting the influence of different diffusion factors on several time-dependent characteristics of electrodes. It is shown here that a well-established approach based on the assumption of the constant concentration of the interfering ion in the sample solution fails for solutions containing strongly interfering ions where the concentration of the interfering ion in the boundary layer of the solution can be far lower in comparison with its concentration in the bulk. The limitation is demonstrated by a drastic discrepancy between experimental and calculated curves for the dependence of potential on time. This limitation can be overcome by taking into account the change of the interfering ion concentration in the boundary layer in accordance with the electroneutrality condition. A good agreement between simulation results and experimental data is demonstrated.
URI: https://elib.bsu.by/handle/123456789/261447
Scopus: 10.1021/acsomega.8b02926
metadata.dc.identifier.scopus: 85060249988
Sponsorship: CHEMREAGENTS program for financial support.
Appears in Collections:Статьи химического факультета

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