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Found 9 results

  1. Hello, I am new in GWB, so probably this should be an easy question to answer for an expert. I am trying to enter a set of analysis in GSS, however, I am confused by the fact that for eg heavy metals i need to know the redox state boforehand. For example, my analysis contains values for Fe and As (not for ferrous/ferric or As speciation). Can I select a "total" redox state if i dont know the speciations? I am also curious about the the option of eg inserting Fe+++ and then make "right click on analyte --> As --> select eg "Fe". Does it solve my problem? Thank you in advance Evans
  2. Hello, I was wondering if someone could help me troubleshoot an issue. I have created a GSS spreadsheet with water quality data for multiple samples and locations to create XY plots, however the Gtplot program keeps crashing when I prompt the request. I am able to create Durov diagrams, piper plots etc, the only type of plot/diagram which keeps crashing is the XY series type. I am sometimes able to convert another type of diagram into a XY series plot, in which case it no longer crashes. I have attached the GSS spreadsheet I used. Note - we inserted a blank sample at the bottom in order to troubleshoot the issue, but this did not help. Is there anything I can do to prevent it from crashing? Thank you, Chelsea Chelsea_WQdata_GWBforum.gss
  3. Hi All, I've been attempting to add water quality measures such as Total Nitrogen and Total Phosphorus to GSS. As these measures are an aggregate of different constituents I cannot specify a molar mass. I have attempted to add them as a user-defined analyte and specified concentration and the units in mg/L. However, when I go to add these analytes to GSS the unit's default to mmol/l. I'm sure I've been able to add these measures in the past but have come up short. Any tips/guidance would be much appreciated. Kind regards, Clint
  4. Hi GWB Forum, I am trying to mix two seawater samples with the same chemistry, but different temperatures and calculate a flash diagram for aragonite saturation state using React following the "Fluid Mixing and Scaling" instructions. I have also calculated the endmember fluid Log(Q/K) values for aragonite using GSS. I am getting a very different answer for the end member compositions depending on which approach I take. I checked that I am using the same thermo database (phreeqpitz) for both, and am having trouble understanding why they are so different. I've attached my React file, and my gss file for your reference. Thanks for any insights, Amanda JFEndmembers.gss JanFeb-Mixing-AssumeSWinboth.rea
  5. Hi All, It has been a few years since I last used GWB. I'm looking forward to getting started again! I've been having a few difficulties with loading up a large number of user defined anlaytes. Specifically, I want to add the following: Site ID Abs. 440 nm B (mg/L) Ca (mg/L) Mg (mg/L) Na (mg/L) K (mg/L) SO4 (mg/L) Cl (mg/L) F (mg/L) I (mg/L) FeII (mg/L) MnII (mg/L) Si (mg/L) D.O. (mg/L) d13C-DIC (‰, V-PDB) DIC (mmol/L) DNPOC (mg/L) NPOC (mg/L) TOC (mg/L) SpC (us/cm) Total Hardness (mg/L, CaCO3) d18O-H2O (‰, V-SMOW) d2H-H2O (‰, V-SMOW) DKN (mg/L) TDN (mg/L) TKN (mg/L) TN (mg/L) ORP (mV) Turbidity (NTU) Water Temp. (◦C) pH Talk (mg/L) HCO3 Alk. (mg/L) Carbonate Alk (mg/L) Br (mg/L) Cd (mg/L) Clarity B.D. (m) E. coli (CFU) Faecal Coliform (CFU) NNN (mg/L) Nitrate-N (mg/L) Nitrite-N (mg/L) TAM (mg/L) DOP (mg/L) DRP (mg/L) TDP (mg/L) TP (mg/L) SSC (mg/L) TSS (mg/L) VSS (mg/L) Zn (mg/L), Abs. 440 nm B (mg/L) Ca (mg/L) Mg (mg/L) Na (mg/L) K (mg/L) SO4 (mg/L) Cl (mg/L) F (mg/L) I (mg/L) FeII (mg/L) MnII (mg/L) Si (mg/L) D.O. (mg/L) d13C-DIC (‰, V-PDB) DIC (mmol/L) DNPOC (mg/L) NPOC (mg/L) TOC (mg/L) SpC (us/cm) Total Hardness (mg/L, CaCO3) d18O-H2O (‰, V-SMOW) d2H-H2O (‰, V-SMOW) DKN (mg/L) TDN (mg/L) TKN (mg/L) TN (mg/L) ORP (mV) Turbidity (NTU) Water Temp. (◦C) pH Talk (mg/L) HCO3 Alk. (mg/L) Carbonate Alk (mg/L) Br (mg/L) Cd (mg/L) Clarity B.D. (m) E. coli (CFU) Faecal Coliform (CFU) NNN (mg/L) Nitrate-N (mg/L) Nitrite-N (mg/L) TAM (mg/L) DOP (mg/L) DRP (mg/L) TDP (mg/L) TP (mg/L) SSC (mg/L) TSS (mg/L) VSS (mg/L) Zn (mg/L) So far I can add the normal basis species. However, when I need to specify user defined analytes, of which I have many, I'm finding that GWB is using mmol/kg as default units. I've attempted to edit these to specify mg/L but it defaults back to mmol/kg. An additional issue, and perhaps the root cause (?), is that I do not have molar mass for some of these species (e.g., Total Organic Carbon, Dissolved Non-purgeable Organic Carbon etc). Secondly, I was wondering how folk deal with adding measures of carbonate alkalinity into GSS? The lab data we use reports Total Alaklnity (mg/L as CaCO3), Bicarbonate Alkalinity and Carbonate (CO3) Alkalinity. As GWB uses alkalinity to assign major ion facies I was hoping someone had experience with adding alkalinity measures (all 3)? Any pointers on either of the above would be gratefully received. Kind regards (Cheers), Clint
  6. Hello Admin, if i am interested in a fO2-pH Predominance diagram of Fe of a speculated fluid with for example the following parameters: H2ASO4 as As = 50 mg/l SO4-- as S = 50 mg/l Fe++ as Fe = 10 mg/l Na++ = 39.34 g/kg Cl- = 60.66 g/kg T = 150 °C ive been using GSS to calculate the activities of specific species which i applied in Act2. For the GSS calculations i did not input any pH value since it will be my x-axis on my diagram. Now my question is if that is the correct procedure since of course using specific pH values in GSS gives me different activities of my species and thus greatly altering the predominance diagram in the end? For what pH or in general for what terms do the activities calculated in GSS apply if no pH is entered? Sincerely Manuel
  7. Dear Brian, How are you? I hope that you are doing very well. I am writing to you because I need your help with GWB. First of all, let me briefly describe my experiment. I have done column percolation tests using natural contaminated soil. I packed the contaminated soil (mainly with heavy metals) in a 5 cm diameter and 30 cm height acrylic column and permeated it with CaCl2 solution 1 mM at a flow rate of 12 mL/h (the flow direction is from bottom to top). I collected around 15 samples (leachate) within 3-month period and analyzed them by ICP and IC (ion chromatography). I input all leachate results in the GSS datasheet and would like to make solubility, speciation and transport modeling. I have the following questions: 1. In the GSS datasheet is there any place where I can input the TOC (total organic carbon) or DOC (dissolved organic carbon)? 2. In the GSS, how can I input Mo concentration? I know that there is no Mo information in the "thermo.dat", so, I changed it to "thermo.com.v8.r6t", but I am still not able to add Mo (I can't find it in "+analyte" > "basic species"). Did I do something wrong? 3. Do I have to know the specie of elements in advance? For example, from ICP analysis, I got the results of total Fe. In GSS, can I choose for example "Fe+++" and then choose the unit "mg/L (as Fe)" and solve the problem of choosing between "Fe++" and "Fe+++"? Another example is regarding B concentration, can I choose the specie "B(OH)3" and then select the unit "mg/L (as B)". One more example is "AsO4--", I think this is the only specie included in "thermo.dat", so I chose it and set as "mg/L (as As)". Is that the correct way to input the data in GSS or should I know the accurate specie since the beginning? 4. Regarding Xt1 transport, I would like to simulate/model the release of elements such as As, Pb, B, etc. and then plot or add the results I obtained from experiments. I have the following questions about what to input in each section: a. "Initial" section: should I input the mineral composition or elemental composition of the soil and the concentration of the permeating solution (CaCl2)? b. "Reactants" section: Should I input the mineral composition of the soil? c. "Inlet" section: Should I input the concentration of the permeating solution (CaCl2)? d. "Domain" section: Do you recommend me to use "linear" type or "spherical" (r1 = r2)? e. "Medium" section: Do I input the diffusion coefficient of the element, the porosity of the soil and the dispersivity of the element I am monitoring? I am very sorry for asking so many questions. Thank you very much in advance for your help. Angelica
  8. Hello, Is there any indication of which database was drawn from when looking at an output file? Thanks! Michael
  9. Hi all, I have got a simple question regarding to mixing of multiple fluids. I’m sure that I must have missed something, so I just wanted to check. I have the composition of three end-member solutions (Solution 1, 2, 3) that would be mixed to produce composition of Solution 4. Say 20%, 30% and 50% of Solution 4 is from Solution 1, 2, 3 respectively. I have the composition of all Solution 1, 2, 3, 4. Essentially I would like to check the mixing fraction through React (at which I have calculated manually) to see whether it gives me a good match for the solution 4 composition. I would like to run this mixing reaction through the REACT model to get the final concentration of Solution 4 with the known composition and mixing fraction of Solution1-3. But from my understanding, is it correct that I can only mix/react one solution with another one at a time on REACT? And of course if I run reaction of solution 1 and 2, pick up>reactant>fluid to react with solution 3 will not give the answer that I wanted since it’s a different mechanism. I have tried GSS where I can mix all three solution all at once. But when I did a test run of only mixing two solutions on GSS, it gives different results from reacting two solutions on REACT. So two questions: What is the best way to do fluid mixing of more than two solutions that accounts for different mixing fraction? What are the difference between GSS mixing function and React? i.e. say if I’m to mix two solutions together. Thank you very much for your help. Have a lovely day. Cheers, Charis
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