Buffer Standards for the Physiological pH of the Zwitterionic Compound, ACES from 5 to 55°C.
The values of the second dissociation constant pK2and 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 paHvalues of four chloride ion free buffer solutions and eight buffer solutions withI= 0.16 mol·kg-1, matching closely to that of the physiological sample. Conventional paHvalues 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 measureEj, 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 NBS/NIST convention. These solutions are recommended as pH standards in the pH range of 6.8 to 7.2 for physiological fluids.
Roy
Rabindra N
RN
Roy
Lakshmi N
LN
Fuge
Michael S
MS
Roy
Chandra N
CN
Himes
Curtis A
CA
Bryant
Paul A
PA
Robinson
Kyle T
KT
Kaufmann
Daniel A
DA
Grove
Colby H
CH
Ghosh
Toshi
T
Bwashi
Adonis
A