The control of acidity in the biological pH range of 6.5 to 7.5 is important in biomedicine. The buffer compounds MES and MOPS have been studied. The pH values for three buffer solutions (for example: 0.08 m MES + 0.08 m NaMESate + 0.08 m NaCl and 0.08 m MOPS + 0.08 m NaMOPSate + 0.08 m NaCl) at temperatures 5, 25, 37, 45, and 55oC have been calculated. The cells were used without liquid junction of the type Pt, H2 (g, 1 atm) | BUFFER (m1) + NaBUFFERate (m2) + NaCl (m3) | AgCl, Ag. The pH values at 37oC for MES and MOPS closely match the pH of blood. The ?-Cl was calculated using Bates-Guggenheim convention and the Pitzer ionic interaction theory. The results will be discussed in terms of use as a primary standard for biological specimens.

Standards for pH measurements of MES and MOPS in saline media of <i>I</i> = 0.16 mol·kg<sup>-1</sup>

239th National Meeting (2010)

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Standards for pH measurements of MES and MOPS in saline media of I = 0.16 mol·kg-1

Standards for pH measurements of MES and MOPS in saline media of I = 0.16 mol·kg^-1