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Geochemical Reaction ModelingConcepts and Applications$
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Craig M. Bethke

Print publication date: 1996

Print ISBN-13: 9780195094756

Published to Oxford Scholarship Online: November 2020

DOI: 10.1093/oso/9780195094756.001.0001

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PRINTED FROM OXFORD SCHOLARSHIP ONLINE (oxford.universitypressscholarship.com). (c) Copyright Oxford University Press, 2021. All Rights Reserved. An individual user may print out a PDF of a single chapter of a monograph in OSO for personal use. date: 16 June 2021

Kinetic Reaction Paths

Kinetic Reaction Paths

20 Kinetic Reaction Paths
Geochemical Reaction Modeling

Craig M. Bethke

Oxford University Press

In calculating most of the reaction paths in this book, we have measured reaction progress with respect to the dimensionless variable ξ. We showed in Chapter 14, however, that by incorporating kinetic rate laws into a reaction model, we can trace reaction paths using time as the reaction coordinate. In this chapter we construct a variety of kinetic reaction paths to explore how this class of models behaves. Our calculations in each case are based on kinetic rate laws determined by laboratory experiment. In considering the calculation results, therefore, it is important to keep in mind the uncertainties entailed in applying laboratory measurements to model reaction processes in nature, as discussed in detail in Section 14.2. In Chapter 14 we considered how quickly quartz dissolves into water at 100°C, using a kinetic rate law determined by Rimstidt and Barnes (1980). In this section we take up the reaction of silica (SiO2) minerals in more detail, this time working at 25°C. We use kinetic data for quartz and cristobalite from the same study, as shown in Table 20.1.

Keywords:   Arrhenius equation, Groundwater flow, Hydrothermal veins, Kinetic reaction path, Ostwald's Step Rule

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