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shensel

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  1. Hello, just checking in on this. Thanks!
  2. Hi Jia, Thank you for the clarification, that is a much better description of the boundaries than what I described at first. However I am confused by your statement quoting my initial question that aqueous species never do not form at all. Could you please provide some further explanation there? I would expect certain aqueous species to not form at all under certain Eh pH conditions (example: the carbonate ion at pH of 1). Thanks, Scott
  3. Hi Jia, I was referring to Act2, but I'm glad you mentioned Phase2. That is very useful information! I was able to create what I needed. Thanks, Scott
  4. Hello, Given that boundaries drawn between species in Eh pH diagrams represent a 50/50 composition of the adjacent species, is it possible for GWB to create additional lines that show when a species is not favored to form at all, or some sort of other ratio of adjacent species such as 75/25? Thanks, Scott
  5. Hello, My question is regarding the quantification of sorption preferences of metals onto a given surface. If I have both arsenic and molybdenum in groundwater sorbing onto HFO, is there a way to tell which (As or Mo) is thermodynamically more stable after sorption? In other words, would some metals have the potential to 'kick off' others that have already sorbed (or out-compete other ions in the groundwater), and if so how can I tell what would remove what? I could probably test this qualitatively by adding and removing metals to see what happens, but am wondering if there is a way to calculate this a bit more quantitatively. I read the section in Bethke, perhaps comparing the products of the equilibrium constant and the boltzman factor of various surface complexes would tell me what I need? Thanks, Scott
  6. Hello, Is there an available or recommended surface dataset for modeling sorption onto manganese oxides such as birnessite? Thanks, Scott
  7. Hi Brian, I appreciate you keeping me informed. Thanks, Scott
  8. Thanks Brian. A quick update: this doesn't always seem to be the case, though I'm not sure why. I've attached GSS examples of the unit change working correctly. I'll still proceed with the default units for now, but maybe this will help your troubleshooting. CB Test2_ug.L.gss CB Test2_mg.L.gss
  9. Hello, When I calculate the CBE with a sample that has alkalinity as ug/L as CaCO3, it gives a different result compared to the same sample with alkalinity as mg/L as CaCO3 (same concentrations). Is this a bug or am I missing something? Example GSS files are attached. Thanks, Scott Hensel CB Test_ug.L.gss CB Test_mg.L.gss
  10. Thanks so much! This really helped. I believe it was my misuse of iron that had me stuck.
  11. Hi Jia, Thank you for the suggestions. I have now converted both fluids to a relative unit (mol/kg) and have attached an updated X1t file here. I still could not converge a reaction between my two fluids, so I tried them individually in React. I did get my Fluid 1 to converge when balancing on sulfate (among others), but could not get my Initial Fluid to converge. I'm not sure why it isn't working, maybe I'm not representing the system properly somehow? I've attached the React file with the fluid I can't converge. Thanks, Scott Initial Fluid_molkg.rea X1t for Quesiton3.x1t
  12. Hi Jia, Thanks you for the reply and the help. I'm sorry I forgot to attach the thermo database, I've attached it here - it is a converted .geo EQ3/6 database that I believe is fairly similar to the thermo.V8.R6+ database. I've experimented with balancing on different ions and still can't seem to get my Fluid 1 to converge. Perhaps you'll have better luck? I did make a couple other changes to the fluids based on my data, so I've re-attached an updated X1t file here. Thanks, Scott X1t for Quesiton2.x1t data0.geo.tdat
  13. Hello, I'm trying to run a flow path model using X1t and can't seem to get it to converge. I've attached my input files here. Any thoughts on how to fix this? I did get my Initial fluid to converge in React by reducing the alkalinity, but that doesn't seem to work for my Fluid 1 or for the Initial fluid in X1t. Any suggestions would be a great help! Thanks, Scott X1t for Quesiton.x1t
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