Isopiestic Determination of Unsaturated and NH4NO3-Saturated H2O + NH4NO3 + Y(NO3)3 + Nd(NO3)3 System and Representation with the Pitzer Model, Zdanovskii−Stokes−Robinson Rule, and Ideal−Like Solution Model

Autor:	Pei-Mei Xia, Mei He, Lin-Dan Gong, Zhi-Chang Wang
Rok vydání:	2008
Předmět:	Thermodynamic model Chemistry Ionic strength General Chemical Engineering Inorganic chemistry Rare earth Pitzer equations Thermodynamics Osmotic coefficient General Chemistry Ideal (ring theory) Representation (mathematics) Pitzer model
Zdroj:	Journal of Chemical & Engineering Data. 54:511-516
ISSN:	1520-5134 0021-9568
DOI:	10.1021/je8004936
Popis:	Isopiestic osmotic coefficients were determined for the unsaturated and NH4NO3-saturated H2O + NH4NO3 + Y(NO3)3 + Nd(NO3)3 system up to the maximum ionic strength I = 30 mol·kg−1 at 298.15 K. The experimental results were represented by a modified Pitzer model (J. Phys. Chem. B 2007, 111, 3704). The isopiestic data were found to closely fit a modified Zdanovskii−Stokes−Robinson model for the unsaturated system and Wang’s ideal−like solution model (Ber. Bunsen-Ges. Phys. Chem. 1998, 102, 1045) for the NH4NO3-saturated quaternary system, respectively, which indicate that there is nonzero interchange energy between NH4NO3 and each rare earth nitrate and a zero interchange energy between the unlike rare earth nitrates. The isopiestic osmotic coefficient measurements and the Pitzer model representations for the NH4NO3-saturated quaternary systems are in good agreement with the ideal−like solution model.
Databáze:	OpenAIRE
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