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EEasley

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  1. I am trying to mix two samples at different temperatures and different pHs. I followed an earlier post on calculating pH for mixing calculations in GSS, however I am not able to calculate the pH after creating the new mixed sample. I made sure that H+ was incuded as a basis species, but the pH does not show up after I select Data>Calcuate (selecting both HCO3 and H+)for the newly calculated mixed sample. Any suggestions? We are trying to find the most efficient way to mix samples at various proportions and be able to quickly calculate the pH, temperature, and speciation of important fluid components. Thanks, Elisabeth
  2. OK, great. Thanks. I was selecting the line and then just choosing a color from the list and it kept changing all of them. It worked for me to click the line, right click, click edit appearance, select the mineral name from the dropdown box, then change the color. Cheers, Elisabeth
  3. Oh, and when will the next maintenance release be? I think it will be easiest for me to edit the plots in another program...I am really picky about images for presentations and I would like to be able to select just a few lines to be dashed. Having a choice of 6 colors is better than no choice at all, but I am plotting saturation curves for 10 to 15 minerals, so it would be nice to be able to have an individual color for each line, so I still need to be able to save as svg Thanks again for the quick response, Elisabeth
  4. EXCELLENT, downloading the update now. Thanks! Elisabeth
  5. I am trying to save an image file from GT Plot as a scalable vector graphic file. The problem I am having with GT Plot (which could be a great modification to the graphics software) is that I am trying to change the colors of several mineral saturation curves. It isn't really possible to use the image files as is, because the program plots the mineral name on top of it's saturation curve, so it becomes very confusing which mineral name belongs to which curve. If I use the files this way in a paper or presentation, it would be a nightmare trying to figure out which curve belongs to which label. So, all I simply need is an explanation of how to individually change the line color, or info on how to save the image file in GT Plot as a svg. The option the save an image file as an SVG appears in the dropdown box for the file extension type, however every time I click on the svg option, it sends an error report and says it has to close GT Plot. Unfortunately, I am using Inkscape (free software), not Adobe Illustrator so I can only work with svg files. In Illustrator, I've been able to use enhanced metafiles, but not in Inkscape. If I had access to Illustrator, none of this would be a problem, but unfortunately I'm not a student anymore so I only have access to free graphics editing software. Please let me know how to resolve this issue. Thanks, Elisabeth
  6. Hi Brian- Got it. Yes, it is quite tedious to plot the errors in this manner for large datasets! Do you forsee any addition to the program that incorporates a more simple function for plotting errors? When you are using geochemical data to verify or support reaction path models, it is nice to have the error bars, however it is a little too time consuming to plot them in this way for large datasets that include 20+ analytes that each have an associated error! Thanks very much for your help, I really really appreciate it! Best, Elisabeth
  7. Attached are the GSS and React files. Thanks. EE Waunita Mixing Smpl 2.rea Nov pH T with ST DEV.gss
  8. Hi Brian- Thanks. I was able to calculate the standard deviation as you described above. I'm not having any success in getting the error bars on an XY plot though...is there a setting that I am missing?? I made sure that the sample points were small enough so that they wouldn't overlap the margin of error, but the actual error bars don't show up. I tried plotting an XY of pH vs Temp in the original GSS spreadsheet, and also as scatter data on a reaction path GTPlot of pH vs temp, but no error bars. Thanks for your help! Elisabeth
  9. Hi- I am adding scatter data to a GTPlot reaction path that I created in REACT. I would like to include error bars on the scatter data, but I am not sure how to go about adding the standard deviations in the spreadsheet. I have already calculated the standard deviation of each analyte in Excel for major cations and anions, and then I am using the reported standard deviation by GeoTech, who rents the multimeter I used to measure field pH and temperature. Basically, I would like to simply add that the pH has a standard deviation of +/- 0.2 pH units and that temp has a standard deviation of 0.15 degrees C. Is there a simple way to just add in the standard deviation, or do I have to enter the standards and measured values in the GSS spreadsheet (as described in the user guide). My main concern is that I am only using reported standard deviation values from the equipment provider for pH and temperature, as I didn't run any calibrations myself (but now I am thinking I should have!). Please let me know if you have any suggestions! Thanks! Elisabeth Easley
  10. Tom- The purpose of the model is to predict the pure thermal end-member water composisiton in order to apply geothermometers (I want to know the composition of the thermal water before it is mixed with groundwater). Dilution and boiling can introduce significant errors to the equilibration temperatures, and so it is important to apply geothermometers to the most thermal end-member to ensure that there are no significant errors. All the water samples that I have collected appear to be mixed with groundwater. I guess I am a little confused about the purpose of using the flash option. For the file I posted earlier, I tried setting it up as a forward model to see how the system would behave if I mixed the sample until it reached essentially the pure groundwater end-member. Then I created an inverse model that "unmixed" the groundwater (I just used negative values for the groundwater components in the reactants)to try and reach the thermal end-member composition. I can get the inverse model to work (flash option off)), but I can only react it one time. Increasing the # of times reacted to > 1 results in nonconvergence. I would like to see what happens if I reacted the system, say 50 or 100 times so that I can see a longer reaction pathway, but I think the problem is that the concentration of the basis species are too low and result in negative concentrations when you subtract out the groundwater components. I've attached the inverse "unmixing" model, with a few mineral phases suppressed. Thanks. Waunita inverse model minerals suppressed.rea
  11. I am working on a problem that involves the mixing of groundwater with a thermal water of mixed composition (it is not a thermal end-member, it has been mixed with GW). I am using REACT and first entering the groundwater end-member in the Basis, running to get the speciation, and picking up the fluid as the reactant. Then I entered the mixed thermal water as the basis and reacted the two. My main question is in handling the temperatures. The groundwater is ~ 11C and the mixed thermal water is ~66C. When I first ran the groundwater and picked it up, does the program keep the 11C temperature that is specified initially, or do I have to re-enter the temperature on the Basis page? I tried setting the third option under the Temp tab, and putting the initial T as 66C and the reactants T as 11C. The purpose of this reaction path is to extrapolate the chemical composition of the pure thermal end-member, but I am not sure if I am going about this the right way. I was hoping to look at the behavior of Cl, HCO3, and SO4 as the fluids are mixed and figure out the saturation limits of these components. I've attached the file below. I'm getting some weird results when I plot the components (Cl, SO4, and HCO3) vs. temperature. Thanks so much. Also, below are the original basis for the GW and thermal water. I set the charge balance on Bicarb b/c I used a field titration to get the data and it seems to be adding a significant amount of error to the charge balance. I also have the flash option on. Basis Groundwater (in mg/kg) Ca++ 16 Mg++ 2.85 Na+ 2.707 K+ 0.4699 HCO3- 47 SO4-- 16 Cl- 1.176 F- 0.109 pH 8.22 O2(aq) 8.45 Temp 11 C Basis- Mixed Thermal Water Ca++ 8.277 Mg++ 0.409 Na+ 148.6 K+ 8.776 HCO3- 117 SO4-- 170.7 Cl- 13.8 F- 16.11 pH 8.22 O2(aq) 1.36 Temp 66 C EEasley Mixing.rea
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