Nancy

Hello, I’m a sporadic user of GWB so basically a beginner, once again, with fading knowledge on geochemistry from grad school. Your forum discussions are a great learning tool so thank you for them. I am trying to model silica at STP but high pH (pH=12-14, ie: concrete pore solution) with excess cations of K, Ca, Na, Li, etc. How valid is the default thermodynamic database at high pH in GWB 8.0. Would one of the other datasets provided be more valid? Do I need to develop some of my own values? If so which thermo-values and modeled behavior can I trust and which may be suspect? I am especially interested in modeling dissolution/ppt, mineral surface complexing and ion exchange. Thank you for any guidance you can provide. Nancy