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Zhang, J., Anson, F.C., Coordination of Fe3+ by “alizarin complexone” adsorbed on graphite electrodes to produce electrocatalysts for the reduction of O2 and H2O2, J. Electroanal. Chem. (1993), 353, 265-280.

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Article

Monitoring pH Using Alizarin-modified Commercial Screen-printed Electrodes

1Department of Chemistry, University of Education Ludwigsburg, Reuteallee 46, D-71634 Ludwigsburg, Germany


World Journal of Chemical Education. 2020, Vol. 8 No. 4, 163-169
DOI: 10.12691/wjce-8-4-4
Copyright © 2020 Science and Education Publishing

Cite this paper:
Achim Habekost. Monitoring pH Using Alizarin-modified Commercial Screen-printed Electrodes. World Journal of Chemical Education. 2020; 8(4):163-169. doi: 10.12691/wjce-8-4-4.

Correspondence to: Achim  Habekost, Department of Chemistry, University of Education Ludwigsburg, Reuteallee 46, D-71634 Ludwigsburg, Germany. Email: A. Habekost@t-online.de

Abstract

A pH-sensor based on alizarin-modified screen-printed multiwalled carbon nanotubes (MWCNT-SPE, Orion High Technologies) imbedded in Nafion® shows a linear dependence between the oxidation potential and the pH from pH 0 to pH 10. This modified MWCNT-SPE is compared to a commercial alizarin SPE (DRP 110ALI, Metrohm - DropsSens). In addition to this technical application, these pH sensors seem to be a good didactic alternative to the widely used pH glass electrode, which many students find hard to understand.

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