title: Buffer Standards for the Biological pH of the Amino Acid N-[2 hydroxyethyl]piperazine-N'-[3-propanesulfonic acid], HEPPS, From (278.15 to 328.15) K.
abstract: For the HEPPS buffer under investigation, there are seven buffer solutions without NaCl and eight buffer solutions that contain Cl(-) and have an ionic strength (I = 0.16 mol·kg(-1)), which is similar to that of blood plasma. These buffer solutions have been evaluated in the temperature range of (278.15 to 328.15) K using the extended Debye- Hückel equation and the Bates-Guggenheim convention. The previously determined E(j) values have been used to determine the operational pH values of HEPPS buffer solutions at (298.15 and 310.15) K. These are recommended as secondary standard reference solutions for pH measurements in saline media with an isotonic ionic strength of I = 0.16 mol·kg(-1).
authors.affiliation: Hoffman Department of Chemistry, Drury University, 900 N. Benton Ave., Springfield, Missouri 65802, USA.
authors.forename: Lakshmi N
authors.initials: LN
authors.lastname: Roy
authors.forename: Rabindra N
authors.initials: RN
authors.lastname: Roy
authors.forename: Joshua T
authors.initials: JT
authors.lastname: Wollen
authors.forename: Meagan A
authors.initials: MA
authors.lastname: Harmon
authors.forename: Jessica M
authors.initials: JM
authors.lastname: Stegner
authors.forename: Ankita A
authors.initials: AA
authors.lastname: Shah
authors.forename: Isaac B
authors.initials: IB
authors.lastname: Henson
references.citation: Anal Chem. 1973 Aug;45(9):1663-6
references.pmid: 4756738
references.citation: J Chem Eng Data. 2009 Jun 11;54(6):1860-1864
references.pmid: 20160876
references.citation: Anal Biochem. 1980 May 15;104(2):300-10
references.pmid: 7446957
references.citation: Clin Chem. 1972 Mar;18(3):206-8
references.pmid: 5020814
references.citation: J Res Natl Bur Stand A Phys Chem. 1961 May-Jun;65A(3):267-274
references.pmid: 32196245
references.citation: Biochemistry. 1966 Feb;5(2):467-77
references.pmid: 5942950
references.citation: J Solution Chem. 2009 Apr 1;38(4):449-458
references.pmid: 20161485