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sit activity coefficient

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8 - Activity Coefficients
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 97-116
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Summary

An activity coefficient relates the concentration of an aqueous species to its chemical potential. This chapter describes in detail the estimation of aqueous activity coefficients using Debye–Hückel methods, the Pitzer virial equations, and Specific ion Interaction Theory (the SIT method). A series of example calculations demonstrates application of the methods and the key differences among them.