Roy LN, Roy RN, Lenoue SR, Denton CE, Fuge MS, Dunseth CD, Roy CN, Hayden SM, Wollen JT, Sreepada K. Buffer Standards for the Physiological pH of the Zwitterionic Compound,
DIPSO from 5 to 55 degrees C.
J SOLUTION CHEM 2009;
38:459-469. [PMID:
20160870 PMCID:
PMC2771870 DOI:
10.1007/s10953-009-9379-2]
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Abstract
The values of the second dissociation constant, pK(2), and related thermodynamic quantities of 3-[N,N-bis (2-hydroxyethyl)amino]-2-hydroxypropanesulfonic acid (DIPSO) have already been reported over the temperature range 5 to 55 degrees C including 37 degrees C. This paper reports the pH values of four NaCl-free buffer solutions and four buffer composition containing NaCl salt at I = 0.16 mol.kg(-1). Conventional pa(H) values are reported for all eight buffer solutions. The operational pH values have been calculated for four buffer solutions recommended as pH standards, at 25 and 37 degrees C after correcting the liquid junction potentials with the flowing junction cell.
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