Juan

Hi Brian, Estimate uranium concentrations on nonsampling wells is more difficult than I thought. Thanks for your hints and sharing your knowledge on GWB but specially on geochemistry. I really appreciate it! Thank you ver much Juan

Hi Brian, As you suggest, choosing the correct ion in charge balace, using reasonable concentrations, swaping and constraining systems are very important aspects of modeling. Both samples run now, so that plot results are obtained correctly. One Question: I swapped U++++ for UO2++ but I didn´t change the concentration value (for this line) in the Basis pane, Is there any problem with that?. I am trying to estimate the concentration of uranium in one nonsampling well base on other uranium concentrations deep-well results. Toposecuence is composed of volcanic and alluvial profiles developed on a riolite basement. Basalts and clay lens are present also.Distance between wells is 20m approximately. Thanks a lot. Juan

Hi Brian, I am sending you two files. Apr10_sample 15 doesn´t run so I can´t see plot results. However Nov09_sample 11 runs perfectly, React let me visualize a minerals (grams) vs. uraninite reacted (mg) gtplot. Can you explain me a reason why it sometimes run and other times don´t? I mean, I just change the chemical analysis in both tests. Thanks Juan Apr10_sample 15.rea Nov09_ sample 11.rea

Hi Brian: I am trying to equilibrate a real water sample and react it with uraninite. Testing with different mass(g)of uraninite and running the simulation several times produces a singular matrix on 1-th iteration. I expected to view results in tabular form and output plot results as the K-feldspar example. Should I send you some water analysis to have more information of the simulation?. The analysis include Eh, temperature, pH, U, TDS and trace and mayor elements. Thanks a lot. Juan Carlos Burillo

thermo_hmw.datHi Brian, I think this is the file you would like to see to solve the problem. Thanks, Juan

Hi Brian, I am sending you the file. I expect you can see what my problem is Thanks a lot Juan screenshot1.ppt

Hi Brian: I am trying to plot a stability diagram on Act2. Before I used Act2 I was working with GSS to calculate some Uranium species SI , I changed the Thermo Data several times so that when I reopened Act2 a textbox dialoge appear: "database C:Programfiles/Gwb/Gdata/thermo_hwt.dat doesn´t match with debye-huckel model". Now U++++ doesn´t appear in diagram species and SiO2(aq) is a unknown comand on comand label. Thanks, I wish I can model with Act2 again. Juan.