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3-(N-吗啉基)-2-羟基丙烷磺酸在(278.15至328.15)K温度范围内生化pH值的缓冲标准液

Buffer Standards for the Biochemical pH of 3-(N-morpholino)-2-hydroxypropanesulfonic Acid from (278.15 to 328.15) K.

作者信息

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

机构信息

Hoffman Department of Chemistry, Drury University, Springfield, MO 65802.

出版信息

J Chem Eng Data. 2009 Jun 11;54(6):1860-1864. doi: 10.1021/je800983y.

DOI:10.1021/je800983y
PMID:20160876
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC2771950/
Abstract

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).

摘要

两性电解质3-(N-吗啉代)-2-羟基丙烷磺酸(MOPSO)的第二解离常数pK(2)值及相关热力学量此前已在(278.15至328.15)K的温度范围内测定。在本研究中，由于贝茨-古根海姆惯例在I = 0.1 mol·kg(-1)以下有效，因此使用德拜-休克尔方程的扩展形式，在(278.15至328.15)K的12个温度下评估了两种不含NaCl的缓冲溶液和三种含NaCl且离子强度(I = 0.16 mol·kg(-1))与血浆中相似的缓冲溶液的pH值。通过使用流动连接池进行测量，估算了(298.

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A Standard for the Measurement of the H of Blood and Other Physiological Media.血液及其他生理介质氢离子浓度的测量标准。
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