Issue 5, 2005

Junction-less reference electrode for potentiometric measurements obtained by buffering pH in a conducting polymermatrix

Abstract

A reference electrode for potentiometric measurements based on conducting polymers (CP) doped with pH buffering ligands is described. Both the CPs and doping ligands are selected and adjusted in such a way that possible ionic and redox sensitivity is hampered, while the pH buffering property of the CP film is exposed. In this way, the electric potential drop at the conducting polymer|solution interface is stabilized and close to constant over a certain pH range. The electrode behaves as a pseudo-reference electrode in amphiprotic solvents or their mixtures, e.g. wateralcohol mixtures. For the first time titration of sulfates with lead(II) in water–methanol solution using two “plastic” electrodes, CP-based Pb2+-sensitive indicator and CP-based reference electrode, is shown. Because the electrode is junction-less it may easily be miniaturized and maintained and thus may serve in frontier applications of sensors.

Graphical abstract: Junction-less reference electrode for potentiometric measurements obtained by buffering pH in a conducting polymer matrix

Article information

Article type
Paper
Submitted
07 Dec 2004
Accepted
10 Mar 2005
First published
29 Mar 2005

Analyst, 2005,130, 637-643

Junction-less reference electrode for potentiometric measurements obtained by buffering pH in a conducting polymer matrix

T. Blaz, J. Migdalski and A. Lewenstam, Analyst, 2005, 130, 637 DOI: 10.1039/B418384C

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