Abstract
In this work, the partial molar volumes of glycine and dl-alanine in aqueous solutions of ammonium sulfate at 0.0, 0.1, 0.3, 0.7, and 1.0 mol·kg−1 are determined between 278.15 and 308.15 K. Transfer volumes were obtained, which are larger for glycine than dl-alanine. On the contrary, the hydration numbers are higher for dl-alanine than glycine, and dehydration of the amino acids is observed with increasing temperature or salt molality. The data suggest that interactions between ion and charged/hydrophilic groups are predominant and, by applying the methodology proposed by Friedman and Krishnan, it was concluded that they are mainly pairwise. A group-contribution scheme has been successfully applied to the pairwise volumetric interaction coefficient. Finally, the dehydration effect on glycine, alanine and serine in the presence of different electrolytes has been rationalized in terms of the charge density and a parameter accounting for the cation’s hydration.
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Acknowledgments
This work is supported by project Project PEst-C/EQB/LA0020/2013, financed by FEDER through COMPETE—Programa Operacional Factores de Competitividade and by FCT—Fundação para a Ciência e a Tecnologia. This work was also co-financed by QREN, ON2 and FEDER (Project NORTE-07-0162-FEDER-000050). The stay of M.A.R. Martins at ICT Prague was arranged within the ERASMUS Program.
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Martins, M.A.R., Ferreira, O., Hnědkovský, L. et al. Partial Molar Volumes of Glycine and dl-Alanine in Aqueous Ammonium Sulfate Solutions at 278.15, 288.15, 298.15 and 308.15 K. J Solution Chem 43, 972–988 (2014). https://doi.org/10.1007/s10953-014-0172-5
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DOI: https://doi.org/10.1007/s10953-014-0172-5