The aqueous dissolution kinetics of the barium/lead sulfate solid solution series at 25 and 60°C

Details The aqueous dissolution kinetics of the barium/lead sulfate solid solution series at 25 and 60°C The aqueous dissolution kinetics of the barium/lead sulfate solid solution series at 25 and 60°C

Dec 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991gecoa..55.3531k&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 55, Issue 12, pp.3531-3541

Computer Science

1

Scientific paper

The dissolution behavior of the Ba x Pb (1- x ) SO 4 solid solution series and pure endmembers was investigated. The solids were precipitated from sulfuric acid solutions, then dissolved in slightly acidified water at 25 and 60°C for 24 h. Endmembers equilibrated within several h at 25°C and several min at 60°C. At 25°C the solid solutions dissolved congruently up to 30 min, then the Ba 2+ concentration decreased and Pb 2+ concentration increased for the duration of the experiments. At 60°C the results were similar except the region of congruent dissolution was over before the first samples were taken at 3 min. Solid solution-aqueous solution (SSAS) reaction paths were followed on Lippmann diagrams. During congruent dissolution the reaction paths dissolved toward stoichiometric saturation. During incongruent dissolution the systems moved toward two-component thermodynamic equilibrium at lower aqueous mole fractions of Ba 2+ , while maintaining steady states of undersaturation with respect to the stoichiometric saturation. At 60°C the solutions maintained steady states closer to stoichiometric saturation than at 25°C. The 25 °C results were fit to the two parameter kinetic model of and (1983) with an additional parameter to account for the precipitation rate dependence of the distribution coefficient. The 60°C results could not be modelled due to a complete lack of data in the congruent dissolution region. The model was able to generate close fits to our Ba 2+ data, but not our Pb 2+ data. The model was unable to generate steady states significantly below the stoichiometric saturation given the observed rates of congruent dissolution. This indicates a process occurs which acts to decrease the congruent dissolution rate after the formation of a secondary phase.

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