Electromotive-force measurements using the cell type: Pt, H2 (g, 1 atm)|BUFFER (m1) + NaBUFFERate (m2) + NaCl (m3)|AgCl, Ag have been carried out at 25 and 37 �C at ionic strength I = 0.16 mol�kg-1.  From emf data, pH values have been calculated for the buffer solutions of PIPES, ADA, and HEPES in mixtures with NaCl. The values of the single-ion activity coefficients of the chloride ion, ?Cl at I = 0.16 mol�kg-1 were estimated using Pitzer ionic interaction theory and the extended form of the Bates-Guggenheim convention. These pH results will be discussed and are recommended as secondary standard reference buffers for clinical study.

Application of the Pitzer model and Bates-Guggenheim convention for the calculation of pH for the physiological buffer solutions PIPES, ADA, and HEPES with NaCl at 25 and 37 °C

245th National Meeting (2013)

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