Solid-solute phase equilibria in aqueous solution. V: The system CdCO 3 -CaCO 3 -CO 2 -H 2 O

Details Solid-solute phase equilibria in aqueous solution. V: The system CdCO 3 -CaCO 3 -CO 2 -H 2 O Solid-solute phase equilibria in aqueous solution. V: The system CdCO 3 -CaCO 3 -CO 2 -H 2 O

Dec 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991gecoa..55.3505k&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 55, Issue 12, pp.3505-3514

Computer Science

5

Scientific paper

The system CdCO 3 -CaCO 3 -CO2-H 2 O was investigated potentiometrically at 25 °C and 1 atm total pressure. Cd (1- x ) Ca x CO 3 solid solutions were prepared over the entire compositional range. Aqueous solutions were kept at constant ionic strength I =3 mol ( Na ) ClO 4 / kg H 2 O . Experimental results were depicted in Lippmann ( x - x aq - log * K ps 0 ) diagrams. The solutus was investigated by pH and Cd 2+ sensitive electrodes and it turned out that the solid solutions neither dissolved congruently nor attained stable equilibrium with aqueous solutions within one week of observation. Consequently, the excess Gibbs energy of mixing of otavite and calcite was determined by a method of successive approximations. Aqueous solutions were presaturated to the supposed equilibrium composition prior to equilibration with solid solutions, and constant pH values, corresponding to constant log *K ps0 values, indicated stable equilibrium. A recently proposed technique of sequential Bayesian excess parameter estimation was employed for data evaluation which led to the conclusion that the otavite-calcite solid solution series has ideal mixing properties.

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