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- W1994805935 abstract "The rate of dissolution of calcite in aqueous solutions can be conveniently discussed in terms of three pH regimes. At low pH (< 4), the dissolution rate is almost directly proportional to the H+ concentration. At higher pH (> 5.5) the dissolution rate is independent of the H+ concentration. Between these values there exists a transitional regime where the H+ dependence varies. These regimes also prescribe regions where the dissolution rate is essentially transport controlled (H+-dependent regime) or controlled by mixed kinetics (H+-independent regime). Using rotating disc experimentation and mixed kinetic theory, it can be demonstrated that the transition from H+ independence to H+ dependence occurs where H+ penetrates the diffusion boundary layer (DBL) and first reaches the surface. The pH of this transitional zone depends on the nature of the calcite reactant, the nature of the medium and the nature of the hydrodynamics of the system. These data enable computations of the calcite surface speciation in the different dissolution regimes to be made. Thus, in the H+-dependent regimes, the surface concentrations of [Ca2+] and [CO2−3] approach equilibrium values. The surface pH-value is several magnitudes lower than the bulk pH-value. The Ca2+, HCO−3 and (CO2(aq) + H2CO3) concentrations decrease with increasing pH, whereas the CO2−3 concentration increases. In the H+-independent region only Ca2+, CO2−3 and H2O are present within the DBL. The first experimental data suggest that the rate-controlling chemical reaction in the H+-independent regime is a first-order surface chemical process involving H2O." @default.
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- W1994805935 date "1984-01-01" @default.
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- W1994805935 title "Calcite dissolution kinetics: Surface speciation and the origin of the variable pH dependence" @default.
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- W1994805935 doi "https://doi.org/10.1016/0009-2541(84)90009-3" @default.
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