Monitoring pH Using Alizarin-modified Commercial Screen-printed Electrodes

Achim Habekost^1,

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

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

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.

Keywords:
second-year undergraduate demonstration hands-on learning/manipulatives electrochemistry analytical chemistry

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