Abstract
The values of the second dissociation constant, pK 2, and related thermodynamic quantities of [N-(2-acetamido)-2-aminoethanesulfonic acid] (ACES) have already been reported over the temperature range 5 to 55 °C including 37 °C. This paper reports the pa H values of four chloride ion free buffer solutions and eight buffer solutions with I=0.16 mol⋅kg−1, matching closely that of the physiological sample. Conventional pa H values for all twelve buffer solutions from 5 to 55 °C are reported. The residual liquid-junction potential correction for two widely used temperatures, 25 and 37 °C, has been made. The flowing-junction calomel cell method has been utilized to measure E j , the liquid-junction potential. The operational pH values for four buffer solutions at 25 and 37 °C are calculated using the physiological phosphate buffer standard based on the NBS/NIST convention. These solutions are recommended as pH standards in the pH range of 6.8 to 7.2 for physiological fluids.
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An erratum to this article is available at http://dx.doi.org/10.1007/s10953-014-0150-y.
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Roy, R.N., Roy, L.N., Fuge, M.S. et al. Buffer Standards for the Physiological pH of the Zwitterionic Compound, ACES, from 5 to 55 °C. J Solution Chem 38, 471–483 (2009). https://doi.org/10.1007/s10953-009-9380-9
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DOI: https://doi.org/10.1007/s10953-009-9380-9