Buffer standards for the physiological pH of the zwitterionic compound of 3-(N-morpholino)propanesulfonic acid (MOPS) from T = (278.15 to 328.15) K |
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| Institution: | 1. Department of Veterinary Microbiology and Pathology, College of Veterinary Medicine, Washington State University, Pullman, WA 99164-7040, USA;2. Animal Disease Research Unit, USDA-Agricultural Research Service, Washington State University, Pullman, WA 99164-6630, USA;3. Wyoming State Veterinary Laboratory, University of Wyoming, Laramie, WY 82070-6752, USA;4. Paul G. Allen School for Global Animal Health, Washington State University, Pullman, WA 99164-7040, USA;1. Department of Chemistry, College of Humanities and Sciences, Nihon University, Sakurajousui, Setagaya, Tokyo 156-8550, Japan;2. School of Pharmacy, Tokyo University Pharmacy and Life Science, 1432-1 Horinouchi, Hachioji, Tokyo 192-0392, Japan;1. Laboratoire Analyse et Modélisation pour la Biologie et l’Environnement (LAMBE), UMR CNRS-CEA 8587, Université d‘Evry-Val-d’Essonne, Boulevard François Mitterrand, F-91025 Evry cedex;2. Laboratoire de Chimie Analytique, Faculté des Sciences de Tunis, Université de Tunis El Manar, Campus universitaire 2092 El Manar, Tunisie;3. Centre de Recherche sur la Matière Divisée, FRE3520 - Université d‘Orléans–CNRS, 1b rue de la Férollerie, 45071 Orléans Cedex 2, France;1. Key Laboratory for Deep Processing of Major Grain and Oil, Ministry of Education, College of Food Science & Engineering, Wuhan Polytechnic University, Wuhan 430023, China;2. Key Laboratory of Pesticide & Chemical Biology, Ministry of Education, Department of Chemistry, Central China Normal University, Wuhan 430079, China |
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| Abstract: | This paper reports the pH values of five NaCl-free buffer solutions and 11 buffer compositions containing NaCl at I = 0.16 mol · kg?1. Conventional paH values are reported for 16 buffer solutions with and without NaCl salt. The operational pH values have been calculated for five buffer solutions and are recommended as pH standards at T = (298.15 and 310.15) K after correcting the liquid junction potentials. For buffer solutions with the composition m1 = 0.04 mol · kg?1, m2 = 0.08 mol · kg?1, m3 = 0.08 mol · kg?1 at I = 0.16 mol · kg?1, the pH at 310.15 K is 7.269, which is close to 7.407, the pH of blood serum. It is recommended as a pH standard for biological specimens. |
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