Tsurko, Elena N. and Neueder, Roland and Held, Christoph and Kunz, Werner (2019) Guanidinium Cation Effect on the Water Activity of Ternary (S)Aminopentanedioic Acid Sodium Salt Solutions at 298.15 and 310.15 K. JOURNAL OF CHEMICAL AND ENGINEERING DATA, 64 (3). pp. 1256-1264. ISSN 0021-9568,
Full text not available from this repository. (Request a copy)Abstract
Vapor pressure measurements were applied to the systems guanidinium hydrochloride (methanamidine hydrochloride) + sodium L-glutamate (S-aminopenthanedioic acid sodium salt) + water at varying concentrations of GndmCl and Na-L-Glu (m(NaGlu) = 0.11.6 mol/kg; m (GndmCl) = 0.104 mol/kg, 0.301 mol/kg, 0.684 mol/kg) for two temperatures, T = 298.15 and 310.15 K. From the experimental results, activities of water, activity coefficients of water, and the corresponding osmotic coefficients of the mixtures Na-L-Glu + GndmCl + water have been calculated, both being directly related to the chemical potentials of the different components and therefore to their Gibbs energy. The modeling of the components chemical potentials in ternary GndmCl + Na-L-Glu + water solutions was done with the equation of state ePC-SAFT. Osmotic coefficients, fugacity coefficients, and activity coefficients of the mixture components were modeled. Experimental osmotic coefficient values demonstrate nonlinear concentration dependences with several extremums at different NaGlu molalities. The theoretical ePC-SAFT approach correctly describes the experimental data. Negative values of binary interaction parameters between the guanidinium ion and the amino acid salt were required in order to model osmotic coefficients of ternary systems salt + amino acid salt + water in good agreement with the experimental data, which shows that the non-Coulomb short-range interactions between ion and amino acid salt are very strong.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | OSMOTIC COEFFICIENTS; AQUEOUS-SOLUTIONS; CHLORIDE; |
| Subjects: | 500 Science > 540 Chemistry & allied sciences |
| Divisions: | Chemistry and Pharmacy > Institut für Physikalische und Theoretische Chemie Chemistry and Pharmacy > Institut für Physikalische und Theoretische Chemie > Chair of Chemistry VI - Physical Chemistry (Solution Chemistry) Chemistry and Pharmacy > Institut für Physikalische und Theoretische Chemie > Chair of Chemistry VI - Physical Chemistry (Solution Chemistry) > Prof. Dr. Werner Kunz |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 16 Apr 2020 07:03 |
| Last Modified: | 16 Apr 2020 07:03 |
| URI: | https://pred.uni-regensburg.de/id/eprint/27434 |
Actions (login required)
 |
View Item |
