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Kinetics and rate controlling factors
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Kinetics-Calculate m0
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Topic: Kinetics-Calculate m0 (Read 2153 times)
Pia-Caroline
Contributor
Posts: 2
Kinetics-Calculate m0
«
on:
June 24, 2015, 12:05:29 PM »
Dear all,
Sorry for that simple question, but I cant find anywhere a suitable formula, information or similar...
The Kinetic exists out of a series of parameters and for the first, the initial moles of the reactant. Please can someone help me, what for input is necessary? In the manual I found the explanation that it also depends on the grain size, but when I recalculate the example (page 314, ManualV3) for getting out the values of the Quartz Example (4.15 Appelo &Parkhurst) it doesnt match.
Thank you very much for your kind assistance!
Pia
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dlparkhurst
Top Contributor
Posts: 3578
Re: Kinetics-Calculate m0
«
Reply #1 on:
June 24, 2015, 01:51:54 PM »
The shrinking core model for the evolution of surface area as minerals dissolve assume that the surface area changes in relation to (M/M0)^n, where M is the current moles of mineral, and M0 is the original moles of mineral. n is an empirical exponent.
The use of M0 is not required. You can define RATES any way that you want, either accounting for evolution of surface area or not.
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PhreeqcUsers Discussion Forum
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Kinetics-Calculate m0