Ian Hutcheon Posted January 24, 2015 Share Posted January 24, 2015 This may be a stupid question, so apologies in advance. Generally, pH is reported at 25°C. If running a model (REACT, SPEC8 etc) at say 60°C is it necessary to first calculate the pH at 60°? Thanks Quote Link to comment Share on other sites More sharing options...
Brian Farrell Posted January 26, 2015 Share Posted January 26, 2015 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 Quote Link to comment Share on other sites More sharing options...
Ian Hutcheon Posted January 28, 2015 Author Share Posted January 28, 2015 Hi Brian Helpful, as always. I will try this. Thanks Quote Link to comment Share on other sites More sharing options...
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