Open Journal of Physical Chemistry

Volume 1, Issue 3 (November 2011)

ISSN Print: 2162-1969   ISSN Online: 2162-1977

Google-based Impact Factor: 0.32  Citations  

Buffer Standards for Physiological pH of the Buffer N-(2-Acetamido)-2-aminoethanesulfonic Acid from 5°C to 55°C

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DOI: 10.4236/ojpc.2011.13016    4,300 Downloads   7,733 Views  Citations

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ABSTRACT

Electromotive force (emf) measurements of the Cell Pt(s), H2(g)|ACES(m1) + NaACES(m2) + NaCl (m3)| AgCl, Ag(s) have been carried out from 5°C to 55°C . The agreement of pH values between two calculated (extended Debye-Hückel and liquid junction correction) is very good. Two buffer solutions without the chloride ion and seven buffer solutions with NaCl, at an ionic strength (I = 0.16 mol.kg-1) similar to that of physiological fluids, have been studied. The pH values for these buffer solutions have been evaluated in the temperature range of 5°C to 55°C using the extended Debye-Hückel equation of the Bates-Guggenheim convention. Values of the residual liquid junction potential (δEj) between the ACES solutions and the saturated KCl calomel electrode solution have been estimated at 25°C and 37°C from the previously determined Ej values using the flowing junction cell to determine the operational pH values at 25°C and 37°C. These ACES buffer solutions are recommended as secondary standard reference solutions for pH measurements in the range of physiological applicati on at I = 0.16 mol.kg-1.

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B. Bodendorfer, Z. Downs, I. Henson, L. Roy, R. Roy, J. Stegner, J. Veliz and J. Wollen, "Buffer Standards for Physiological pH of the Buffer N-(2-Acetamido)-2-aminoethanesulfonic Acid from 5°C to 55°C," Open Journal of Physical Chemistry, Vol. 1 No. 3, 2011, pp. 118-123. doi: 10.4236/ojpc.2011.13016.

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