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ZTwatson

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Everything posted by ZTwatson

  1. Simple question here, when reacting a solution with another, I wonder what the "reactant times" refers to. Would 0.1 be 10% mixture or 1000 ml plus 100 ml (thus it would be 1/11, 9.1% reactants). It is set at 1 as a default, so technically its a 2 liter mixture, 1 liter from each? I am just trying to make sure that understand exactly what percentage of the solution is the reactants for my analysis. Thanks
  2. Where can I find the information on what time of day this workshop will run? I am scheduled to attend but cannot seem to find this information anywhere.
  3. OK Thanks. I am setting up my initial fluid system. I have a few more questions... Can I set up the initial and final pressure conditions? For the first simulation I would like to simply take a single fluid and move it to different pressure and temperature conditions to determine potential precipitation of minerals and exsolution of gas. As far as I understand it is that the system will "react" the fluid to reach the defined final fugacity....? When setting the system to a sliding fugacity, must I know the final fugacity value? Is there a way to have the system determine these values based on the HCO3 concentration, pH and initial/final pressure conditions? If I want to prevent precipitation of, for example CaCO3, should I "config>suppress>calcite"?
  4. I am interested in determining the exsolution of CO2 due to the mixing of two different fluids. The natural system I study is artesian, so the interaction between fluids happens as they migrate upwards and pressure decreases. Obviously the CO2 exsolves primarily as a function of the pressure decrease but some interesting things happen presumably due to the interaction between aquifers and source waters. Is there a way that I could determine this using React?
  5. Brian, So if I do not specify the redox condition SpecE8 will assume the water is fully oxidized? Also, what values are fugacities reported in? I can't seem to find any specifications on what the unit is. I assume it is the value of pressure released by the gas, so a value of 1 would relate to 1 atm, or 1 bar (roughly). and .54 would relate to .54 atm? thanks, zach w.
  6. I have a few ions that do not exist in the thermo.dat database. For example, Ti (Titanium). How do I go about adding these ions to my GSS data sheet so I can have them in my solution calculations? Thanks, Zach W.
  7. Brian, Thanks for the response. I assume I am launching SpecE8, though I am not entirely sure. I just enter the data and then go to calculate and determine things like saturation indices or CO2 fugacity. We do not have any measured DO or Eh. O2 fugacity is not at equilibrium with the atmosphere. The water comes from depths below the surface, would that mean O2 fugacity is lower? I don't believe we can assume equilibrium with any minerals as well. When I am running solutions using GSS, are there important variables that I need to set up before I run the program? I only have pH, temperature and ionic compositions.
  8. I am having trouble running a solution through GSS when I enter iron as Fe instead of Fe++ or Fe+++ (this doesn't happen if I leave the species as Fe++ or Fe+++). The calculated error report shows up. I do not know the speciation of iron in my solution. Related articles containing solution composition give iron as Fe(total) and make no remarks on the speciation. If it helps, sulfate dominates the solution for sulfur, so I assume the solution is oxidized. Here is my input... Input: data "C:\Program Files\Gwb\Gtdata\thermo.dat" verify 1.000000 free kg H2O 6.590000 "pH" H+ temperature 16.500000 1056 "mg/l" Ca++ 237 "mg/l" Mg++ 4269 "mg/l" Na+ 347 "mg/l" K+ 4698 "mg/l" HCO3- 1921 "mg/l" SO4-- 4046 "mg/l" Cl- 4.1 "mg/l" Li+ 13.8 "mg/l" Sr++ 1.4 "mg/l" Mn++ 2.1 "ug/l" V+++ 7.5 "ug/l" Ni++ 11.4 "mg/l" Fe++ as Fe Results: Any help is greatly appreciated. Thanks, Zach W.
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