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Sensors 2009, 9(1), 118-130; doi:10.3390/s90100118
Article

Effect of Structural Design of Silver/Silver Chloride Electrodes on Stability and Response Time and the Implications for Improved Accuracy in pH Measurement

*  and
Analytical Science Team, National Physical Laboratory, Teddington, Middlesex, TW11 0LW, UK
* Author to whom correspondence should be addressed.
Received: 3 December 2008 / Revised: 19 December 2008 / Accepted: 5 January 2009 / Published: 7 January 2009
(This article belongs to the Section Physical Sensors)
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Abstract

The response time of thermal electrolytic Ag/AgCl reference electrodes is defined by the porous structure that limits the rate at which traces of any previous solution are diluted by any new solution environment. The electrode stabilisation time when transferred from one electrolyte to another has been shown to change when different structural designs to the conventional sphere of Ag/AgCl are used. Electrodes fabricated with cylindrical architectures of Ag/AgCl have shown improved stability and reach equilibrium faster than spherical electrodes. This work has positive implications for the accuracy and throughput of primary pH measurements made using the Harned cell.
Keywords: pH; Harned cell; Ag/AgCl chloride electrode; stability; primary methods pH; Harned cell; Ag/AgCl chloride electrode; stability; primary methods
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Brewer, P.J.; Brown, R.J.C. Effect of Structural Design of Silver/Silver Chloride Electrodes on Stability and Response Time and the Implications for Improved Accuracy in pH Measurement. Sensors 2009, 9, 118-130.

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