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Croatica Chemica Acta, Vol. 86 No. 1, 2013.

Original scientific paper

https://doi.org/10.5562/cca2235

Effect of Bubbling on the Potential of Reference Electrode

Nikola Kallay ; Division of Physical Chemistry, Department of Chemistry, Faculty of Science, University of Zagreb, Horvatovac 102a, HR-10000 Zagreb, Croatia
Matija Lovrak ; Division of Physical Chemistry, Department of Chemistry, Faculty of Science, University of Zagreb, Horvatovac 102a, HR-10000 Zagreb, Croatia
Tajana Preočanin orcid id orcid.org/0000-0002-6670-6503 ; Division of Physical Chemistry, Department of Chemistry, Faculty of Science, University of Zagreb, Horvatovac 102a, HR-10000 Zagreb, Croatia
Filip Šupljika ; Division of Physical Chemistry, Department of Chemistry, Faculty of Science, University of Zagreb, Horvatovac 102a, HR-10000 Zagreb, Croatia

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Abstract

The method for the examination of gas/water interface electrokinetic behavior is developed.
"Bubbling potential", i.e. the difference in the potential of the indicator electrode in the absence and presence
of gas bubbles was measured. The indicator electrode is a reference electrode with the porous plug
exposed to gas bubbles. The charged bubble in contact with the porous plug would affect the potential of
the indicator electrode. However, electrodes, whose potential depends on the reversible interfacial reaction,
would be relaxed due to the interfacial ionic equilibration and their potential will not be affected by
the presence of bubbles. Measured Bubbling potentials are directly related to electrokinetic - potentials.
The proposed method is fast, accurate and reproducible so that it can be used for the examination of
gas/water interfaces in different conditions. The isoelectric point of argon bubbles in the aqueous NaCl solution
was obtained as pHiep = 3.9 and pHiep = 3.4 at ionic strength of 10–3 and 10–2 mol dm–3, respectively.
(doi: 10.5562/cca2235)

Keywords

Air/Water Interface; bubbles; electrokinetics; electrokinetic -potential; bubbling potential

Hrčak ID:

101914

URI

https://hrcak.srce.hr/101914

Publication date:

3.5.2013.

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