Dear Christophe,
In the React app, the results file output a dataset in tabular form. You can scroll down and see the concentrations of various basis species sorbed and in fluid and more information(e.g. mineral saturation state, reactants, gasses, etc..) at each reaction step.
However, another way to retrieve numerical data is to use Gtplot and copy and paste the data onto an excel spreadsheet. You can select ‘Plot Results’ in the Results pane and Gtplot will open up. Double-click in the plot to open the XY Plot Configuration dialog. Select the desired X and Y axis parameters and click apply to modify the plot. For example, you can plot one or many components in fluid as the Y-Axis parameter and Rxn progress on the X-Axis. To obtain numerical data for this data, you can click Edit --> Copy as --> Spreadsheet and the paste the data in an excel spreadsheet. For more detailed instructions, you can refer to the ‘How do I retrieve numerical data from my plots?’ on the GWB Tutorials webpage and section 6.7 in the GWB Reaction Modeling Guide.
The number of moles regarding strongly and weakly binding surfaces refers to the sorption site density available on the sorbing mineral. In this case, for every mole of ferric hydroxide precipitated, there is 0.005 moles of strongly binding surface sites and 0.2 moles of weakly binding surface sites available.
Hope this helps.
Best,
Jia Wang