Abstract
Surface species control the mechanism and rate of low-temperature silicate dissolution and precipitation reactions in dilute solutions. This has been repeatedly emphasized1–;7. The interaction between dissolved species and silicate surfaces involves exchange and adsorption phenomena, which equilibrate rapidly, and are accessible to determination by surface titration8,9. Here we report a comparison of surface species concentrations with the dissolution rates of olivine and albite which indicates that while the dissolution rates are a complex function of solution pH, the dissolution rates have a simple first-order dependence on surface concentrations of specific surface species. Thus, the interpretation of the kinetic data for olivine and albite dissolution becomes simple when the chemical speciation at the mineral surface is incorporated, and this approach holds great promise for unifying the rate data for many important silicates.
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Blum, A., Lasaga, A. Role of surface speciation in the low-temperature dissolution of minerals. Nature 331, 431–433 (1988). https://doi.org/10.1038/331431a0
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DOI: https://doi.org/10.1038/331431a0
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