Abstract
Potentiometric measurements of aqueous urea solutions (less than2.5 mol-dm−3 of urea) were performed at different temperature and ionic strengths (10≤T≤45°C; 0.02≤I≤0.6 mol-dm−3) to determine thermodynamic protonation parameters. The formation of the species U2H+ was hypothesized to explain the concentration dependence of the protonation constant.
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References
P. G. Daniele, A. De Robertis, C. De Stefano, M. Marangella, C. Rigano, and S. Sammartano,Biochim. Clin. 13, 507 (1989).
P. G. Daniele, S. Sammartano, M. Petrarulo, O. Bianco, and M. Marangella,Third International Symposium on Recent Advances in Pathogenesis and Treatmant of Nephrolithiasis, (Abstracts, Turin, 1986).
M. Marangella, P. G. Daniele, M. Romzani, S. Sonego, and F. Linari,Urol. Res. 189 (1985); B. Finlayson,Kidney Int. 13, 344 (1978); and references reported in both papers.
P. G. Daniele, A. De Robertis, C. De Stefano, C. Rigano, and S. Sammartano, work in preparation.
E. M. Wooley and L. G. Hepler,Anal. Chem. 44, 1520 (1972); and references therein.
A. E. Martell and R. M. Smith,Critical Stability Constants, Vols. 3, 5, 6, (Plenum, New York, 1977, 1982, 1989).
P. G. Daniele, A De Robertis, C. De Stefano, and S. Sammartano,J. Solution Chem. 18, 23 (1989).
C. Rigano, M. Grasso, and S. Sammartano,Ann. Chim. (Rome) 74, 537 (1984); C. De Stefano, P. Princi, C. Rigano, and S. Sammartano,Ann. Chim. (Rome) 77, 643 (1987).
C. De Stefano, A. De Robertis, C. Rigano, and S. Sammartano,Colloquium Chemiometricum Mediterraneum (Abstract, Barcelona, 1987), p. 87.
A. De Robertis, C. Rigano, S. Sammartano, and O. Zerbinati,Thermochim. Acta 115, 241 (1987).
F. J. Millero,J. Phys. Chem. 74, 356 (1970).
E. Högfeldt,Stability Constants Part A, “Inorganic Ligands” (Pergamon, Oxford, 1982).
A. Casale, A. De Robertis, F. Licastro, and C. Rigano,J. Chem Res. (S) 204, 1601 (1990).
J. Timmermans,The Physico-Chemical Constants of Binary Systems in Condensed Solutions, Vol. 4., (Interscience, New York, 1960).
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De Stefano, C., Famá, A. & Salvo, G. Thermodynamic parameters for the protonation of urea at different temperatures and ionic strengths. J Solution Chem 21, 397–404 (1992). https://doi.org/10.1007/BF00647862
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DOI: https://doi.org/10.1007/BF00647862