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Título: | Partial molar volumes of glycine and dl-alanine in aqueous ammonium sulfate solutions at 278.15, 288.15, 298.15 and 308.15 K |
Autor: | Martins, Mónia A.R. Ferreira, Olga Hnědkovský, Lubomír Cibulka, Ivan Pinho, Simão |
Palavras-chave: | Partial molar volume Hydration Group-contribution Charge density Alanine Glycine |
Data: | 2014 |
Citação: | Martins, Mónia A.R.; Ferreira, Olga; Hnědkovský, Lubomír; Cibulka, Ivan; Pinho, Simão (2014). Partial molar volumes of glycine and dl-alanine in aqueous ammonium sulfate solutions at 278.15, 288.15, 298.15 and 308.15 K. Journal of Solution Chemistry. ISSN 0095-9782. 43:5, p.972-988 |
Resumo: | 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. |
URI: | http://hdl.handle.net/10198/13398 |
DOI: | 10.1007/s10953-014-0172-5 |
ISSN: | 0095-9782 |
Aparece nas colecções: | CIMO - Artigos em Revistas Indexados à WoS/Scopus |
Ficheiros deste registo:
Ficheiro | Descrição | Tamanho | Formato | |
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MartinsJSC2014.pdf | 448,92 kB | Adobe PDF | Ver/Abrir Acesso Restrito. Solicitar cópia ao autor! |
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