Аннотация:The alkaline earth carbonates are an important class of minerals. This volume compiles
and critically evaluates solubility data of the alkaline earth carbonates in water and in
simple aqueous electrolyte solutions. Part 1, the present paper, outlines the procedure
adopted in this volume in detail, and presents the beryllium and magnesium carbonates.
For the minerals magnesite (MgCO3), nesquehonite (MgCO33H2O), and lansfordite
(MgCO35H2O), a critical evaluation is presented based on curve fits to empirical and=or
thermodynamic models. Useful side products of the compilation and evaluation of the
data outlined in the introduction are new relationships for the Henry constant of CO2
with Sechenov parameters, and for various equilibria in the aqueous phase including the
dissociation constants of CO2(aq) and the stability constant of the ion pair MCO0
3ðaqÞ(M¼alkaline earth metal). Thermodynamic data of the alkaline earth carbonates consistent
with two thermodynamic model variants are proposed. The model variant that
describes the Mg2þHCO
3 ion interaction with Pitzer parameters was more consistent
with the solubility data and with other thermodynamic data than the model variant that
described the interaction with a stability constant. VC 2012 American Institute of Physics.
[doi:10.1063/1.3675992]