The microporous structure of silver/silver chloride electrodes and the implications for Harned cell operation |
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Authors: | Richard J C Brown Martin J T Milton |
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Institution: | (1) Analytical Science Group, National Physical Laboratory, Teddington, Middlesex, TW11 0LW,, UK |
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Abstract: | The stability of silver/silver chloride reference electrodes when moved between different electrolyte solutions is limited
by the small amount of solution transferred. The time required for the Ag/AgCl electrode potential to stabilize has been shown
to increase with electrode size in an empirical fashion. The results presented suggest the presence of a microporous structure
in the electrodes that limits the rate at which traces of any previous solutions are diluted by any new solution environment.
Operational implications for the stability and accuracy of the Harned Cell used as the primary standard for pH measurements
and the certification of primary reference buffers are discussed.
Presented to the CCQM Electrochemical Analysis Working Group, Paris, April 2004. |
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Keywords: | pH Harned cell Silver chloride electrodes |
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