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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.