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2 results

  • 11 - Three-Layer Complexation

  • from PART I - EQUILIBRIUM IN NATURAL WATERS
  • Craig M. Bethke, University of Illinois, Urbana-Champaign
  • Book:
    Geochemical and Biogeochemical Reaction Modeling
    Published online:
    09 December 2021
    Print publication:
    06 January 2022, pp 147-156

  • Summary

    Surface complexation is the process by which aqueous species react chemically with specific sites at the aqueous–solid interface to form surface complexes. This chapter describes in detail electrostatic triple-layer theory and its cousin the CD-MUSIC model, and how the methods can be integrated into multicomponent equilibrium models. A worked example demonstrates how the theory might be applied in the study of natural waters.

  • 17 - Kinetics of Dissolution and Precipitation

  • from PART II - REACTION PROCESSES
  • Craig M. Bethke, University of Illinois, Urbana-Champaign
  • Book:
    Geochemical and Biogeochemical Reaction Modeling
    Published online:
    09 December 2021
    Print publication:
    06 January 2022, pp 211-222

  • Summary

    Many minerals in the geochemical environment do not react rapidly enough with coexisting fluids to maintain thermodynamic equilibrium. Kinetic laws for this reason are required to predict the rates at which such minerals dissolve and precipitate. This chapter shows how rate laws of this class can be incorporated in multicomponent chemical reaction models, illustrates how such models behave, and provides advice on how the models might be best applied to advantage by scientists and engineers.