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swhitman

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  1. Ah, OK. This is what I was looking for. I understand what it is doing now. It is not really a visualization of charge balance showing the major species, just which basis cations and anions make up the solution. That makes sense. I'm not sure what I was thinking with the ionic strength for these charts. Thanks Again for your help. Spencer
  2. Thanks. If I do as you said for the example of sulfate, I get the following for by-component equivalents with the bar graph (169.7 meq/kg for SO4--): Step Xi H2O Al+++ Ca++ Cd++ F- Fe++ H+ K+ Mg++ Mn++ O2(aq) SO4-- SiO2(aq) Zn++ meq/kg meq/kg meq/kg meq/kg meq/kg meq/kg meq/kg meq/k
  3. Thanks again, sorry to belabor this, but I just can't seem to make these plots in a way that actually reflect the data, as explained below. I had gone over section 8.1 and de-selected "common ions". Something still seems wrong, but I can't figure out what. One thing I notice is that the bar chart (posted above) would seem to indicate about double the amount of ionic strength as what the results show (see text results below from SpecE8 for this water). I ended up making the plot I wanted using a combination of PHREEQC and Python, included below. The ionic strength is pretty
  4. Thanks Jia, very helpful. I think I am almost there. I can calculate the concentrations of the various species as you describe. However, using the Graphs -> Pie Chart (or Bar Chart) option in GSS, all of the iron is still listed as Fe++, but from doing the calculations, I know that most of the iron is present as Fe(3) (mostly FeSO4+). Does the "Fe++" on the bar chart just mean that that portion of cations is from the BASIS species (Fe++), and not actually Iron in the Fe(2) state? Also, I assume that "total component concentration" would be Fe in the original basis species (
  5. Hello Jia, Thanks for the reply. Good to know I can manually specify the redox distribution by decoupling. What I was thinking I would like to do was to enter total iron, then enter either a redox couple (e.g. O(0)/O(-2) or my pe measurement, or specify redox equillibrium with a mineral phase (e.g. pyrite), and then speciate all redox species based on that. Is that possible to do? If so, can you help me with how to do it? Thanks, Spencer
  6. Hello, I am interested in calculating the charge balance of some chemical analyses and representing them graphically (e.g. with a pie graph in units of meq). The question I have is how to represent species that can be present in multiple valences (e.g. Fe). The default for Fe in GSS is as Fe+++, which is likely to be true for some of my samples, but not all. Do I need to do a SpecE8 run first and specify some kind of redox conditions in order to have Fe as both Fe++ and Fe+++? This question would apply to other elements with multiple charge states. When I calculate charge
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