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Karen Johannesson

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About Karen Johannesson

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  1. Hi Jia, I have made pseudo minerals before (e.g., "arsenogoethite" in a paper I published in GCA at the end of 2019), so I was perplexed by the modified thermo.tdat database not seeing it when I tried to run X1t. I like to work from scripts and less so from the GUI, but maybe I'll try this approach you outline above. I wasn't making a surface dataset, because I was following the approach of Park et al. (2009) to add the pseudo minerals Na2EX2 and CaEX2 directly to the thermo.tdat file. I need to be able to "turn on" the cation exchange reaction for only a portion of the flow path because
  2. I thought I had posted this question yesterday, but it seems to be lost. Anyway, I have been trying to model cation exchange in X1t without having to build a dll library in C++. Instead, I was wondering if this could be done with a simple basic script. Again, I am following the approach of Park et al. (2009), and have added the "pseudo-minerals" Na2EX2 and CaEX2 to the thermo-tdat data base. I also wrote basic scripts (example for Na2EX2 rate law) to see if X1t will evaluate them. However, I can't seem to coax X1t to recognize the "pseudo-minerals". Do I absolutely need to instead write a C++
  3. I have written custom rate law scripts in BASIC describing mineral dissolution precipitation that I have used successfully with React (see attached example for anorthite). Can I do the same thing with X1t? I would like to write similar scripts for cation-exchange along a groundwater flow path.
  4. Hi Jia, Thank you so much. That really helped me out in a big way. Now that I can compute a surface area, I can iterate to see which effective kinetic rate constants best fit my data. Best wishes, and stay safe, Karen
  5. I am trying to develop a model for an aquifer I have been studying for years using an approach similar to that descried in Park J., Sanford R. A., and Bethke C. M. (2009) Microbial activity and chemical weathering in the Middendorf aquifer, South Carolina. Chemical Geology 258, 232-241. Specifically, I am at odds as to how the authors set their specific mineral surface areas, which range from 34.9 for dolomite to 36.9 for calcite, as well as what the volume percent of each mineral consider, all of which are listed as 1 volume%. I have attached a portion of this script. Basically, I cannot figu
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