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bclement2142

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About bclement2142

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  1. Another question I had was, how can I account for dissolve phase total organic carbon data? I don't see carbon as an available option to add to the basis.
  2. Thanks Brian. Those recommendations did help. I ran into another issue when trying to decouple redox pairs for MnO4- and Mn2+ and Cr04-- and Cr3+. We have both liquid and solid phase data which I would like to be able to enter separately into the same basis file. For example if I assume the dissolved phase data for chromium is present as CrO4-- in units of ug/L and my solid phase is present as Cr 3+ in units of mg/kg, when I go to the results pane to rerun the solution. I get an error that reads "Exit: React stop: set_basindex: bad basis type React is ending." and the program closes. Am I going about this the right way or am I doing something wrong? I just want to make sure I am considering both what we know to be present in solid and dissolved phases within the aquifer at each location and am not underestimating the mass/dosage of ferrous sulfate we will need.
  3. Hi, I'm a new user to the software and am trying to simulate reduction of hexavalent chromium to chromium III by reacting the defined system with a ferrous sulfate amendment. As the ferrous sulfate concentration is increased in the reactants pane, more and more hematite is precipitated but very little to no chromium is converted from Cr VI to CrIII. Am I missing a step, or is this just what is most likely to happen under these conditions? I noticed also that Eh hardly seems to change from iteration 0 to 100 when the solution converged, no matter what concentration of the amendment is used. Is there a way to add your field measured Eh data in the Basis pane? Or can you only add it on a sliding scale in the Reactant pane? When I adjust the Eh in the reactants pane, the chromium does seem to precipitate out in the simulation, but it seems arbitrary for me to manually alter the Eh - I want to make sure that's what would be occurring in the real system as a result of the amendment. Does GWB automatically account for Eh changes as the result of a reactant with the system or does that need to be added as it's own reactant? I've attached the txt file script for the solution and the .rea file. Thanks, Ben React_output-React 25 mgL Ferrous Sulfate.txt MW-5S React_1-123016.rea
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