Densities and apparent molar volumes for aqueous solutions of HNO3−UO2(NO3)2 at 298.15 K

Abstract

In order to obtain the exact information of atomic number density in the ternary system of HNO3-UO2(NO3)z-H20, the densities were measured with an Anton-Paar DMA60/602 digital density meter thermostated at 298.15+0.01 K. The apparent molal volumes for the systems were calculated from the experimental data. The present measured apparent molar volumes have been fitted to the Pitzer ion-interaction model, which provides an adequate representation of the experimental data for mixed aqueous electrolyte solutions up to 6.2 mol/kg ionic strength. This fit yields O r. and ~z, which are the first derivatives with respect to pressure of the mixing interaction parameters for the excess free energy. With the mixing parameters 0 z, and ~v, the densities and apparent molar volumes of the ternary system studied in this work can be calculated with good accuracy, as shown by the standard deviations.

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“…The apparatus, the mixture standard sample preparation, and the procedure of density measurements have been described elsewhere. 15,16 The density F of the binary solutions was used to calculate the excess molar volume V E , according to where x i is the mole fraction, M i is the molar mass, and F i is the density of component i.…”

“…The apparatus, the mixture standard sample preparation, and the procedure of density measurements have been described elsewhere. , …”

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