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3 results

  • 14 - Mass Transfer

  • 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 177-182

  • Summary

    Reaction processes can be driven by the transfer of mass into or out of a multicomponent chemical system held at equilibrium. Complex reactions, for example, can occur when a solid phase dissolves into or precipitates from a fluid held in equilibrium. This chapter discusses how such processes might be simulated and interpreted using computer modeling techniques.

  • 15 - Polythermal, Fixed, and Sliding Paths

  • 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 183-196

  • Summary

    The distribution of chemical mass in a multicomponent system held at equilibrium changes when the system’s temperature varies, or when chemical potentials in a phase in contact with the system shift. This chapter discusses how to construct numerical simulations of reaction processes driven by polythermal conditions, or by changing chemical boundary conditions.

  • 16 - Geochemical Buffers

  • 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 197-210

  • Summary

    Chemical buffers, reactions that resist change in a system’s chemical state, exert strong controls on the chemistry of the natural environment. Important buffers in nature include heterogeneous buffers arising from reactions among aqueous species, as well as heterogeneous buffers caused by reactions of a fluid with an external solid or gas phase.