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AliMahaqi

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  1. Dear Jia, I hope this message finds you great. I am going to add clinopyroxene and Stapafell basaltic glass to my database as minerals to do reaction path modeling. Based on the formula, I could add every components, but I have serious issue with adding silicic acid (amin problem) as I could not find it as a species in "Species in reaction" and if I could not add it to the chemical reactions, I see charge and mass imbalance, could you please explain to me how can I solve this issue? (I have also attached the files including formula - taken from papers that did reaction path modeling in PHREEQC if helps- and a screenshot of the database) Thanks in advance
  2. Thanks a bunch Jia, for your points. I got the point for different values of pH. (Just one thing remains, how we could find when and where to enable/disable the precipitation option in our modeling?) And, I want to know if the first procedure that I explained is correct to make a CO2-saturated solution. Much appreciated.
  3. Hello, I was wondering if you help me to make a CO2-saturated solution. I have a water sample and then calculate the amount of CO2 needed to saturated it based on Duan et al. 2006 (http://149.165.154.118/co2/co2calc2.php, as the T= 298.15 K, P= 1 atm, and m NaCl is 0.1). I just want to know what I am doing is correct, I put the needed CO2 for saturation of solution (0.0318m CO2(g)) in the reactants (as simple) and then react it with the water sample. For your convenience, attached the React file. I need this CO2-charged solution as a basic solution to do reaction path modeling as well as reactive transport modeling. The next question is in the previous model, the pH of water sample is 8.2, but when the mixing of CO2 in water starts, the modeling shows the initial pH 7.4 (at step 0), why? Based on the procedure I told, the decreasing trend of pH should be from 8.2 to 5.2 (after mixing needed CO2 to make a CO2-saturated solution), but the modeling shows the range from 7.4 to 5.2. Thanks for your explanation in advance. CO2_saturates_solution.rea
  4. Hello Jia and Brian, I was wondering if you tell me if we have a water analysis that shows iron content as Fe (total), how we can add it to the basis? Thanks
  5. Hello Jia, I really appreciate your time to respond. How can I add a new mineral as a reactant once it's not available. For example, I want to add labradorite or augite as a reactant but those are not available in the list.
  6. Dear Jia, Thanks for your response and clarification. In React or SpecE8, when we want to swap for example a mineral, we need to know it is in equilibrium or not, right? (then, how I can assume this? I thought to find which minerals are in equilibrium with the system, add the water analysis result in basis pane in SpecE8 or React and then run and check the result to find out which minerals are in equilibrium (SI values 0), then use them for the final run and swap them). Yes, the final goal is running a reactive transport modelling to show the changes occur in a shallow basaltic aquifer exposed to a CO2-charged solution leakage. The available data are water analysis, chemical composition and mineralogy of host rock, and we then hypothesize a leakage solution. As I understand, first of all, I need to use water analysis to find out which mineral are in equilibrium with the system of interest, then for next run, swap those minerals in the basis inputs in X1t or X2t (I will decide which one is better reach my favourite results). The question I have is when and where I need to add chemical or mineralogy of host rock (basalts)? (I guess, the CO2-charged solution should add as a reactant to monitor chemical reactions, right?)
  7. Hello, I am Ali and we have GWB pro in our centre, but I am actually not so familiar with the steps to run a scenario. I want to run a model to monitor water-rock interactions in a shallow basaltic aquifer exposed to a CO2-charged fluid (leakage scenario). Could you please tell me regarding the procedure step by step? (for instance, putting water samples in React, then find out which minerals in host aquifer in equilibrium and then put them all as a basis for X1t or x2d simulations,...) any help high appreciated.
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