Hi Brian,
Thank you for looking at my file. The pH=8.5 is the pH of initial brine. As the CO2(g) dissolves in the initial brine, I see that, in the model, the pH value is dropping to around 5 and more CO2 (aq) are being produced. So defining the CO2 fugacity as sliding at 50 atm is right?
In our work, no siderite dissolution was observed. The model results shows no siderite dissolution either. Do you think our numerical model does not really reflect the conceptual model correctly?
Also one more question to make sure one thing?? I thought fugacity was something related to the CO2 gas not to the CO2 (aq) species? Do you mean that as CO2 gas dissolves in the water, the CO2 fugacity increases?
Many thanks!!!! You have been so helpful!!!
Regards,
Chans