EEasley
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Posts posted by EEasley
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Hi Elisabeth,
We're hoping to come out with 9.0.2 within the next few weeks. Btw, there are two options for multicolor lines in 9.0.1. You can check the "multicolor" option which is an icon with 6 different colors, or you can select individual lines and choose any color. To use the second option, right-click your line, choose "Edit Appearance..." then next to Line color you can choose colors for lines one-by-one.
Regards,
Brian
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
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EXCELLENT, downloading the update now.
Thanks!
Elisabeth
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
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Hi Elisabeth,
You're in luck. Since you're using 9.0, I would recommend you download the free update to 9.0.1 to set line colors individually and take advantage of many other improvements and fixes. You can automatically color all lines with a standard 6-color palette, or select the color of individual lines manually.
I looked at saving the image as an svg (and other file types) and I'm getting the same error that you are (GWB 8 seems to work okay). We'll look into this and hopefully get it fixed before the next maintenance release. Do you have access to Microsoft PowerPoint? That works pretty well for editing plots. I think the Open Office version will work too.
Hope this helps,
Brian Farrell
Aqueous Solutions LLC
EXCELLENT, downloading the update now.
Thanks!
Elisabeth
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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
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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
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Hi Elisabeth,
Can you post your GSS and React files so I can take a look at your problem?
Thanks,
Brian
Attached are the GSS and React files. Thanks.
EE
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Hi Elisabeth,
All you need to do to set errors bars is enter a triplet of values separated by vertical bars in each cell of your GSS spreadsheet. For pH, put in 6.3|6.5|6.7, for example, to create error bars of standard deviation 0.2 about a measured pH value of 6.5. Unfortunately you cannot just enter a standard deviation value once and have it apply for all your datapoints. This may be a bit tedious, but that is how the program is set up right now.
Hope this helps,
Brian Farrell
Aqueous Solutions LLC
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
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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
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Hi Elisabeth:
Your temperature settings are correct, but the 'flash' option is preventing proper polythermal mixing from occurring. Can you explain a little more about what the purpose of this model is?
Regards,
Tom Meuzelaar
RockWare, Inc.
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.
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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
Mixing samples in GSS
in The Geochemist's Workbench
Posted
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