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Buffer Standards for the Biochemical pH of 3-(N-morpholino)-2-hydroxypropanesulfonic Acid from (278.15 to 328.15) K.
Roy, Lakshmi N; Roy, Rabindra N; Denton, Cole E; Lenoue, Sean R; Roy, Chandra N; Ashkenazi, Shahaf; Fuge, Michael S; Wollen, Joshua T; Stegner, Jessica M; Allen, Kathleen A; Harmon, Meagan A.
Afiliación
  • Roy LN; Hoffman Department of Chemistry, Drury University, Springfield, MO 65802.
J Chem Eng Data ; 54(6): 1860-1864, 2009 Jun 11.
Article en En | MEDLINE | ID: mdl-20160876
The values of the second dissociation constant pK(2) and related thermodynamic quantities of the ampholyte 3-(N-morpholino)-2-hydroxypropanesulfonic acid (MOPSO) have been previously determined at temperatures from (278.15 to 328.15) K. In this study, the pH values of two buffer solutions without NaCl and three buffer solutions with NaCl having ionic strengths (I = 0.16 mol·kg(-1)) similar to those in blood plasma, have been evaluated at 12 temperatures from (278.15 to 328.15) K using an extended form of the Debye-Hückel equation, since the Bates-Guggenheim convention is valid up to I = 0.1 mol·kg(-1). The liquid junction potentials (E(j)) between the buffer solutions of MOPSO and saturated KCl solution of the calomel electrode at (298.15 and 310.15) K have been estimated by measurement with a flowing junction cell. These values of E(j) have been used to ascertain the operational pH values at (298.15 and 310.15) K. Three buffer solutions of MOPSO are recommended as useful reference solutions for pH measurements in saline media of ionic strength I = 0.16 mol·kg(-1).

Texto completo: 1 Colección: 01-internacional Banco de datos: MEDLINE Idioma: En Revista: J Chem Eng Data Año: 2009 Tipo del documento: Article

Texto completo: 1 Colección: 01-internacional Banco de datos: MEDLINE Idioma: En Revista: J Chem Eng Data Año: 2009 Tipo del documento: Article