The Origin of the Non-Constancy of the Bulk Resistance of Ion-Selective Electrode Membranes within the Nernstian Response Range
The dependence of the bulk resistance of membranes of ionophore-based ion-selective electrodes (ISEs) on the composition of mixed electrolyte solutions, within the range of the Nernstian potentiometric response, is studied by chronopotentiometric and impedance measurements. In parallel to the resist...
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MDPI AG
2021-05-01
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| Series: | Membranes |
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| Online Access: | https://www.mdpi.com/2077-0375/11/5/344 |
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doaj-6351b9eae5f644e8939aa170bea4740b2021-05-31T23:25:03ZengMDPI AGMembranes2077-03752021-05-011134434410.3390/membranes11050344The Origin of the Non-Constancy of the Bulk Resistance of Ion-Selective Electrode Membranes within the Nernstian Response RangeValentina Keresten0Elena Solovyeva1Konstantin Mikhelson2Chemistry Institute, Saint Petersburg State University, 26 Universitetsky Prospect, 198504 Saint Petersburg, RussiaChemistry Institute, Saint Petersburg State University, 26 Universitetsky Prospect, 198504 Saint Petersburg, RussiaChemistry Institute, Saint Petersburg State University, 26 Universitetsky Prospect, 198504 Saint Petersburg, RussiaThe dependence of the bulk resistance of membranes of ionophore-based ion-selective electrodes (ISEs) on the composition of mixed electrolyte solutions, within the range of the Nernstian potentiometric response, is studied by chronopotentiometric and impedance measurements. In parallel to the resistance, water uptake by the membranes is also studied gravimetrically. The similarity of the respective curves is registered and explained in terms of heterogeneity of the membranes due to the presence of dispersed aqueous phase (water droplets). It is concluded that the electrochemical equilibrium is established between aqueous solution and the continuous organic phase, while the resistance refers to the membrane as whole, and water droplets hamper the charge transfer across the membranes. In this way, it is explained why the membrane bulk resistance is not constant within the range of the Nernstian potentiometric response of ISEs.https://www.mdpi.com/2077-0375/11/5/344ion-selective membranesionophoresmixed aqueous solutions of electrolytesresistancewater uptakenanometer-sized water droplets |
| collection |
DOAJ |
| language |
English |
| format |
Article |
| sources |
DOAJ |
| author |
Valentina Keresten Elena Solovyeva Konstantin Mikhelson |
| spellingShingle |
Valentina Keresten Elena Solovyeva Konstantin Mikhelson The Origin of the Non-Constancy of the Bulk Resistance of Ion-Selective Electrode Membranes within the Nernstian Response Range Membranes ion-selective membranes ionophores mixed aqueous solutions of electrolytes resistance water uptake nanometer-sized water droplets |
| author_facet |
Valentina Keresten Elena Solovyeva Konstantin Mikhelson |
| author_sort |
Valentina Keresten |
| title |
The Origin of the Non-Constancy of the Bulk Resistance of Ion-Selective Electrode Membranes within the Nernstian Response Range |
| title_short |
The Origin of the Non-Constancy of the Bulk Resistance of Ion-Selective Electrode Membranes within the Nernstian Response Range |
| title_full |
The Origin of the Non-Constancy of the Bulk Resistance of Ion-Selective Electrode Membranes within the Nernstian Response Range |
| title_fullStr |
The Origin of the Non-Constancy of the Bulk Resistance of Ion-Selective Electrode Membranes within the Nernstian Response Range |
| title_full_unstemmed |
The Origin of the Non-Constancy of the Bulk Resistance of Ion-Selective Electrode Membranes within the Nernstian Response Range |
| title_sort |
origin of the non-constancy of the bulk resistance of ion-selective electrode membranes within the nernstian response range |
| publisher |
MDPI AG |
| series |
Membranes |
| issn |
2077-0375 |
| publishDate |
2021-05-01 |
| description |
The dependence of the bulk resistance of membranes of ionophore-based ion-selective electrodes (ISEs) on the composition of mixed electrolyte solutions, within the range of the Nernstian potentiometric response, is studied by chronopotentiometric and impedance measurements. In parallel to the resistance, water uptake by the membranes is also studied gravimetrically. The similarity of the respective curves is registered and explained in terms of heterogeneity of the membranes due to the presence of dispersed aqueous phase (water droplets). It is concluded that the electrochemical equilibrium is established between aqueous solution and the continuous organic phase, while the resistance refers to the membrane as whole, and water droplets hamper the charge transfer across the membranes. In this way, it is explained why the membrane bulk resistance is not constant within the range of the Nernstian potentiometric response of ISEs. |
| topic |
ion-selective membranes ionophores mixed aqueous solutions of electrolytes resistance water uptake nanometer-sized water droplets |
| url |
https://www.mdpi.com/2077-0375/11/5/344 |
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