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Sensors 2010, 10(3), 2202-2216; doi:10.3390/s100302202
Article
Effect of Silver Annealing Conditions on the Performance of Electrolytic Silver/Silver Chloride Electrodes used in Harned Cell Measurements of pH
Analytical Science Division, National Physical Laboratory, Teddington, Middlesex TW11 0LW, UK
* Author to whom correspondence should be addressed.
Received: 22 February 2010; in revised form: 5 March 2010 / Accepted: 16 March 2010 / Published: 17 March 2010
(This article belongs to the Section Chemical Sensors)
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Abstract: We have studied the long and short term stability of electrolytic Ag/AgCl electrodes fabricated from Ag wire that has been subjected to a range of different annealing conditions. At elevated temperatures, the presence of oxygen during the annealing process has been shown to be detrimental to the performance of electrodes produced. This phenomenon has been attributed to the dissolution of oxygen in the Ag lattice leading to structural changes in the Ag/AgCl electrode material. Electrodes prepared from Ag wire annealed in the absence of oxygen have shown no appreciable change in performance throughout the temperature range employed. This work has resulted in an improved understanding of the optimum annealing conditions required for Ag used in the preparation of electrolytic Ag/AgCl reference electrodes. This work has positive implications for the accuracy of Harned cell measurements of pH.
Keywords: pH; Harned cell; Ag/AgCl electrodes; annealing; stability
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MDPI and ACS Style
Brewer, P.J.; Brown, R.J.C. Effect of Silver Annealing Conditions on the Performance of Electrolytic Silver/Silver Chloride Electrodes used in Harned Cell Measurements of pH. Sensors 2010, 10, 2202-2216.
AMA StyleBrewer PJ, Brown RJC. Effect of Silver Annealing Conditions on the Performance of Electrolytic Silver/Silver Chloride Electrodes used in Harned Cell Measurements of pH. Sensors. 2010; 10(3):2202-2216.
Chicago/Turabian StyleBrewer, Paul. J.; Brown, Richard. J. C. 2010. "Effect of Silver Annealing Conditions on the Performance of Electrolytic Silver/Silver Chloride Electrodes used in Harned Cell Measurements of pH." Sensors 10, no. 3: 2202-2216.