Determination of the pH in the physiological range of 6.0 to 8.0 is of importance in clinical chemistry and biomedicine.   The pH values for four TES buffer solutions at the temperatures 5, 25, 37, and 55 �C have been calculated. The liquid junction correction has been made.  Potentiometric measurements were made using a cell of the type: Pt, H2 (g, 1 atm)|TES (m1) + NaTESate (m2) + NaCl (m3)|AgCl, Ag.  The results will be explained and are recommended as secondary pH standards for biological fluids.

Standard pH values of the buffer compound TES from 5 to 55 °C

243rd National Meeting (2012)

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