Christophe Simbo

Hi there, We have emailed you and have not heard back from you, so I decided to share this issue in the forum. A colleague and I have been "remotely" sharing the GWB professional subscription. We have been using it for a week now, but yesterday, my colleague got the 7466 error message(see the above title) when he tried to deactivate so that I can start using It. Can you please help us resolve this issue? Thank you,

Hey there, I'd like to know how to plot data on Eh vs pH diagram. I am able to construct the diagram with all the species but I cannot figure out how to plot these data (see the attached figure). Is it through Excel? or...I did it on Act2 Thank you,

Thank you!

Thank you so much for your reply. In the same line, I would like to know the contrast between the non-reacting solute and the sorbed particulate and the particulate in solution(the latter two are understandable) .As in the below figures(Sorbing Solutes section), It is said that the non-reacting curve is in blue. I was trying to retrieve data from the non-reacting component of the solutes but I couldn't find any.

Thank you for your reply Dear Wang. If I have asked that question it's because I did as you described up here based on the graph pH versus sorbed fraction.May be it's not the appropriate XY plot. If so, could you enlighten me what XY plot that can yield the maximum sorbed and in solution components of the solutes . Thank you

So sorry I just find out that it was a problem of units in X axis.

So sorry to ask one more question on the "waste injection well" topic..I went through all steps but on graph Volume=f(dolomite reacted), the dolomite function cannot be plotted. Can some one guide me on this issue(see attached image)?

In acide drainage and buffering in Task3 "Co-precipitation", I cannot understand where some figures were found and to make my question more clearer, I attach the part that difficult to understand on there. Where can I find the sorbed and in solution quantities of species? I tried to click on "view results" I did not find them nor are they found in graphs. Does 0.005 moles of the strongly binding surface/mole of precipitate refer to As(OH-)4 as 0.2/ 25.4 = 0.007 and that of 0.2(weakly binding surface) refer to Na+ and Ca2+? Thank you

In GWB Reaction Modeling (page 19), Could you explain how to choose or select one ion to set a charge balancing. An example to this case has been applied on the topic "Acid drainage and buffering", and Ca2+ as been chosen for "Balance species". Can other ions be chosen instead of Ca2+? Thank you

Just to let know that I figured out how to plot together both curves on the above Fig. Thank you

Thank you so much for the reply Dr Farrel. I was able to pinpoint where the issue was. But my other main question concerns the species highlighted((H+, CO2aq and HCl). I am wondering why the H+ concentration variation depends only (or mainly?) on HCl and CO2 dissociation as they are many other species that might contribute to the decrease in pH. My second concern relates the Reaction Kinetics part. Can you elaborate more how to plot together the undersaturated and supersaturated curves in the same graph using MS PowerPoint(see attached graph)? Thanks again for your enlightenment!

As a new user of GWB package I am going through all training materials on the GWB ONLINE ACADEMY and now I have an issue of making the graph Change in Concentration(mmol/kg) versus Temperature (C). From what I made, the CO2aq and HCl curves overlap but I am surprised to see how both curves don't overlap in your case. What did you do so that curves cannot be overlap? Thank you