kelvin

Dear Tom: Could you tell me what happen about my question? Regard, Kelvin

Dear Tom: I have problem about Eh-pH diagram for my case(Please see the attachments). My questions is as follows: Why CuCl3-- species boundary display discontinuously ? Regards, Kelvin Pourbaix diagram of Cu.ppt case1.ac2

Dear Tom: I have some problem about Eh-pH diagram for my case(Please see the attachments). My questions are as follows: 1.Why some species boundary display discontinuously ? 2.Why some species(fig(2)&(3)) change so much after increasing 0.01 degree Celsius ? Regards, Kelvin My case_diagram.ppt My case.ac2

Dear Tom: 1.How can I know the aqueous species, minerals or gases of interest in my model that do not have log K values defined in the temperature range? 2.Whether the log K values provided by all thermo data are defined in 25C ? Regards, Kelvin

Dear Tom: Thank you very much. But in U06C_80.rea script, I am not sure whether I need to select the "extrapolate" option as U06C_80.act script. When I intend to run all programs in GWB above or below 25C, the "extrapolate" option must be turn on. Is it correct? Regards, Kelvin

Dear Tom: I will attach the script that is causing the problem to you. Thanks. Regards, Kelvin U_06C_25_Problem.rea

Dear Tom: Thanks a lot. May I ask more question about this case? When I run React after Basis entry, it shows the Error message "Don't know how to set charge balance:species Cl- is not in the bsais". After balance on HCO3-, it dose not show the Error message but the Run pane shows "Residual too large". Then I balance off HCO3-, it runs normally. Could you tell me how to run React correctly in this case? Regards, Kelvin

Dear Tom: The React and Act2 scripts are as attachments. Regards, Kelvin U06C_25.ac2 U06C_80.ac2 U06C_25.rea U06C_80.rea

Dear Tom: I use the Act2 program(GWB 8.0.8) to draw the pe-pH diagram of UO2++. The basic information are as follows: UO2++(total) = 1.000000E-06 (M) | HCO3-(total) = 5.304055E-04 (M) T=25C & 80C The results are shown as attachment. From the results, we can see when pH=8 and pe=0, the predominant species is UO2.25 at 25C, and the predominant species is UO2.3333(beta) at 80C. But when I use the React program to perform the speciation modeling, it shows: UO2.3333(beta) ppt at pH=8 and pe=0 at T=25C, UO2.6667 ppt at pH=8 and pe=0 at T=80C. The results from React and Act2 are different. Why? Could you help me to confirm these results. Thanks a lot. Kelvin

Dear Tom: Sorry. I try to express my question in attachment again. I hope you can understand. Regards, Kelvin

Hi Tom: Sorry, I am new in GWB. As mentioned above(see the second attachment), if I want to know the predominance of species in system at pH=1 & pe=14, how can I do?

Dear Tom: Thanks for your help. After turning on the "extrapolate" option, it looks like OK. But when I built it at 80C, it looks like a little strange(see attachments). My questions are as follows: 1.Can I extend the temperature range to 80C via "extrapolate" option ? 2.Does it have temperature calibration in "thermo.com.v8.r6+.dat" ? 3.The waterlimit line looks like strange. Is it correct? Sincerely, Kelvin

Dear Tom: Yes, I run GWB in Window Vista Chinese version. Regards, Kelvin

Hi, I use Act2 to built a Eh-pH diagram. But the plot can't display the correct temperature unit(ex. 25℃ ---> show 25蚓 or 25?). How can I do?

Hi, I use GWB pro. 8.0 to built the Eh-pH diagram of Fe in the presence of Cl-, the input informations are as follows: # Act2 script, data = "c:\program files\gwb\gtdata\thermo.dat" verify swap e- for O2(aq) diagram Fe++ on pe vs pH log activity main = -6 log activity Cl- = -.79 speciate Cl- x-axis from 0 to 14 increment 1 y-axis from -16.9 to 16.9 increment 2 When I change the temperature condition(ex. 24.9C, 25C, 25.1C), the results seem the same(fig(a)~©). But when I change the database(thermo.com.v8.r6+), the results seem different(fig(d)~(f)). Why?? Thanks a lot.