Buffers for the Physiological pH Range: Studies of 4-(N-Morpholino)butanesulfonic Acid (MOBS) from 5 to 55 °C |
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Authors: | Rabindra N Roy Lakshmi N Roy Kathleen A Allen Casey J Mehrhoff Isaac B Henson Jessica M Stegner Alexis L Jenkins Ankita A Shah Stephen D Rocchio |
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Institution: | 1. Hoffman Department of Chemistry, Drury University, 900 N. Benton Ave., Springfield, MO, 65802, USA
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Abstract: | In this study, we report the pH values of two buffer solutions without chloride ion and eight buffer solutions with NaCl with an ionic strength I=0.16 mol?kg?1. Electromotive force (emf) techniques have been used to get the cell potentials at 12 temperatures from 5 to 55?°C, including 37?°C. An extended form of the Bates-Guggenheim convention is used in the entire ionic strength range, 0.04 to 0.16?mol?kg?1. The residual liquid junction potentials (??E j ) of the buffer solutions of MOBS have been estimated from previous measurements with a flowing junction cell. These values of ??E j have been used for correction in order to ascertain the operational pH values of four buffer solutions of MOBS at 25 and 37?°C. These solutions are recommended as pH standards for physiological application in the pH range 7.4 to 7.7. |
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