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pH and Temperature


Ian Hutcheon
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Hi Ian,

 

Not a stupid question at all. I think you'll want to take your analysis at 25 C and project it to the temperature of interest to get the correct pH. To do so, you'll need to set up a simple polythermal path. Chapters 14 and 23 in the Geochemical and Biogeochemical Reaction Modeling text should be helpful here. Additionally, Chapter 25.1 includes an example which uses a pH corrected to 60 C (done for the reader). Try verifying the calculation for yourself by defining the "Barracoutta A-3" fluid at 25 C, then sliding the temperature up to 60 C. You'll want to ensure mineral precipitation or dissolution don't change the concentration of any fluid components when doing this.

 

Hope this helps,

 

Brian Farrell

Aqueous Solutions LLC

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