Bea

Hi Jia, Thanks for the answer. So, if I understood correctly I can't have a fluid with a free mineral in the basis and react it with a different rock composition in the reactants panel? for my model, I need to have a fluid (seawater composition with a set amount of Ca and SO4) that has gypsum in it (in wt%). The reactants have a completely different rock composition (basalt). Do you have a suggestion on how to do this? Regarding O2 and H, I don't want to set my oxidation state nor my pH, but the model will not run without them. I add them in very small amounts as I did with all other elements that are in the reactants panel but not in the basis panel. My question is if there is a better way of doing this and how will this affect the results of my oxidation stat and pH? Regarding the data set used in the new version of GWB. I have run the same models with the new version and got different results. I am not sure what changed and how this would affect my results. Why would this change? is there a way of seeing it in my previous version of GWB? Thanks for all you help. Cheers, Bea

- When I want to react a fluid with oxides that are not in the basis panel I add them to the basis in very small amounts just so the reaction will happen. Is there a better way of doing this? How does it affect the reaction if you do that with oxygen and hydrogen? I want the oxidation state and pH to be controlled by the reaction without fixing them to a specific pH and oxidation state. - What is the difference between the "reaction times" on the bottom of the reactants panel to delxi under stepping? I am trying to see the mass reacted at 0.5,1, 1.5,2 etc, but I keep getting a jump from 0.1 g to 18 g of mass reacted in the results. This only happens with lower temperatures. - How do I add a mineral to my fluid in the basis panel without swapping an element? I want to have gypsum in my fluid without needing to swap Ca or SO2 to gypsum as the fluid has both in the composition. Cheers.