[CO2 and changing pH]

Hi,

I was wondering if there is a way to input CO2 at varying fugacities in SPEC_E8, and have it adjust for the pH difference. Say I have a solution at pH 7 originally and want to add 1 atm of CO2 to the solution, can it determine what the resultant pH will be and display the saturation indecies with respec tot the changing pH. Thanks

 

Alex

 

I am running version 6.0.5

[Adding CO2 (g) to a solution]

Hi,

 

I need to add CO2(g) to a solution at 1 atm, 2 atm and 3 atm. How would I set this up using SpecE8. I have a starting pH of 6.7 and want to see how chaning the CO2(g) fugacity will influence my saturation states. I am running SpecE8 6.0.5 with thermo.dat. Thanks

Alex

[Changing solution pressure in SpecE8]

Hi

I am working on modelling well water, and need to adjust the solution pressure to 1000-1500 psi to simulate conditions at the pump. Is there a way to do this using SpecE8, thank you.

Alex Janssen

 

I am using thermo.dat and running specE8 version 6.0.5.

[Problems with pyrite in Act2]

I am using version 6.0.5. and i think its may be that I am not using thermo.dat, instead i am using thermo.com.v8.r6+.dat

as i needed Molybdenum species in my diagrams. thanks

 

Alex:

 

What version are you using?

 

The above script has a few configuration problems. The following is a working configuration, and does not show the temperature discrepancy:

 

data = "c:\program files\gwb\gtdata\thermo.dat" verify

temperature = 24 C

swap Pyrite for Fe++

swap e- for O2(aq)

diagram Pyrite on Eh vs pH

log activity main = 0

x-axis from 0 to 14 increment 2

y-axis from -.75 to 1.25 increment .5

 

Let me know if that gets you where you want to go,

 

Tom

[Problems with pyrite in Act2]

Hi Alex:

 

This is hard to troubleshoot without seeing your script- can you attach it?

 

Regards,

 

Tom Meuzelaar

RockWare, Inc.

 

This is the code I used. I ran the 25°C test first then the 26 after, but any temperature other than 25 seems to give the same result.

Act2> T = 25

Act2> diagram Pyrite on Eh vs pH

Act2> x frp, 0 to 14

Act2> x from 0 to 14

Act2> y from -1 to 1

Act2> a Pyrite 1

Act2> go

Act2>

Act2> T = 26

Act2> go

Act2>

[Problems with pyrite in Act2]

Hi,

I found a problem when looking at pyrite species in Act2. At 25°C, there seems to be no issue, but as soon as i change to a different temperature, higher or lower, by any amount, even 1°C, the diagram turns from 2 species, to just pyrite. If anyone could explain why this is happening it would be appreciated. Thanks

 

Alex

[Thermodynamic Database containing Molybdenum]

Does anyone have, or know of a database containing Moly, that will work with GWB v 6. I have not been able to find one that works with GWB online that contains moly. any help would be greatly appreciated. Alex