Usman Abdullahi Usman

Dear Jia Wang, Thank you so much for your brilliant comments and suggestion. Sir, I am fresh and new user of the GWB. I have already managed and produced my Equilibrium phase diagrams for iron oxide-hydroxide and sulphides. What I want to know is how to produces Activity-Activity diagram to know which minerals are theoretically stable and unstable in relation to my water sample analysis. Thant why I need guidance on how to start the Activity-Activity digram, e.g Fe2+ - Activity of O2-, Fe3+ - Activity of O2- or Fe2+ - Activity of SO42-. Your above explanation is good but you confused me by saying I should provide thermo database file... Therefore, below are part of my inputs files. Sir, I want to know how to start building the Fe2+ - Activity of SO42. Thank you. Best regard. Usman

Dear Brian/All, Please help and guide me on how to produce Fe2+ V activity of O2-, Fe3+ V O2- and Fe2+ V SO42- activity diagrams. Thank you. Best regard Usman

Dear All, I am still new user of Geochemist's workbench software. I want create iron phase stability diagrams and i have the Geochemical data of 30 groundwater samples. My aim is to develop Iron phase samples in Fe(II)/Fe(III) ans S(II-)/S(VI) equilibrium or disequilibrium models. Please I need your help on how to develop the models using Act2. Please help with some examples if possible. Thank you all. Best regard Usman

Dear Jia, I will try and follow your suggestions. Thank you so much for the brilliant guide. I will get back to you. Best regard Usman

Dear Brian/all members, Please help me at your convenient time, I will be much happy if you can solve my problems. I have never use geochemist workbench software before, my challenging areas follows: 1. I want to swap and replace my pH values with total iron (Fet) values in the Durov diagram so that i can discuss the relationship between the high Fe concentration with the fluid compositions. 2. Aluminum solubility phase diagram, Mg silicate phase stability diagram (Log Mg++/H+ VS pH), K silicate phase stability diagram (Log K+/H+ Vs Log a SiO2(aq)) and Na+/H+ Vs Log a SiO2(aq). I have tried to plot these 4 diagrams, the first challenge I don't understand mg++/H+, K+/H+ data. So I tried to plot Al, Vs pH for aluminum solubility, K Vs Si for K-silicate stability phase, etc. 1. Mg silicate phase stability diagram (Log a Si Vs Log a Mg/H+) I Have tried to plot the Magnesium silicate phase stability diagram, but I feel like is not correct. I want to know how to plot my scatter data to overlap on the diagram like Aluminium solubility diagram. Attached is the data file. Thank you. Best regard Usman