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pH

Care, Maintenance and Fault Diagnosis
for pH Electrodes

Authors: John J. Barron, Colin Ashton & Leo Geary Technical Services Department, Reagecon Diagnostics Ltd, Shannon Free Zone, County Clare, Ireland

Abstract

Analysts frequently encounter pH measurement problems caused by poor electrode performance. Diagnosis and rectification of these problems can be time consuming, leading to poor analytical results and inefficient use of analysts time. The diagnosis of many individual pH electrode faults has previously been published but a complete, straightforward regime that diagnoses all common electrode faults has never been reported in the scientific literature. This paper presents a unique, comprehensive, easy to follow regime, which can be used to identify and rectify electrode faults. As many common faults can be prevented through adequate care and maintenance the paper also describes the correct care and maintenance steps required to prevent the occurrence of these problems. Adopting the guidance given in this paper will allow analysts to achieve high quality pH measurements and reduced incidence of poor performance of their pH measurement system.

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The Effects of Temperature on pH Measurement

Authors: John J. Barron Colin Ashton & Leo Geary Technical Services Department, Reagecon Diagnostics Ltd, Shannon Free Zone, County Clare, Ireland

Abstract

Some of the effects of temperature on pH measurement have been described or alluded to in both instrument manufacturers instructions and independent scientific literature. Some of these have been presented in a very theoretical manner and thus have been of limited practical value, others have been described adequately from a practical perspective. However a comprehensive classification of the principal effects of temperature on pH with practical remedial actions to correct, reduce or eliminate these errors has never previously been reported. This paper presents for the first time a clear classification of the practical effects of temperature on pH. It provides a definite set of guidelines on how the different errors can be reduced or eliminated thus giving the user greater confidence in the result of their pH measurements.

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