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  1. Hi GWB Forum, I am currently working on my thesis on corrosion and scaling in thermal waters of geothermal power stations. I hope GWB can help me analyse these reactions in geothermal brines (high pressure, high temperature). Therefore I downloaded the student version. I have the following questions. 1) Can GWB simulate corrosion? 2) As far as I know mineral precipitation can only be calculated with the standard version of GWB. Is there a way to simulate scaling/precipitation in the student version? 3) As far as I know pressure is not included in the calculation, but how can I consider pressure? Do I have to use another database of GWB to include pressure in the calculation? Do I have to use a totally different software like PhreeqC to consider high pressure? 4) Does GWB automatically calculate the amount of CO2 contained in thermal water, if I include other parameters like HCO3-, pH etc. For example I have an analysis of thermal water, where the brine was first degassed and content of CO2 was measured. Then the amount of ions like HCO3- was measured. Since I can only put either CO2 or HCO3- into the calculation, does GWB conclude CO2 content from the other values like HCO3- or in other words is one of both values sufficient? For instance I'd like to simulate scaling/precipitation of calcite in a geothermal power station, that pumps the brine from a depth of about 4350 m through pumps, heat exchangers etc. and reinjects it. If I can calculate the solubility of minerals like calcite or can simulate the precipitation for the different locations/parameters in the power station, I can estimate the extent and location of scaling. The pressure is an important parameter in this example because the brine loses pressure, which leads to degasing of CO2, which leads to precipitation. That's why I need to consider it. Thanks in advance for the answers.
  2. Good day! My name is Justin Whitaker and I am a 4th year Honour's student at the University of Ottawa as part of the Fortin lab group. This is my first post to this forum and I thank you for reading my post - and hopefully fielding it as well! At the present time, I am currently conducting some Geochemistry work as part of my cross-disciplinary Honour's work but, as a biomedical and medicinal chemist by training, I have not had any formal training in programs such as PHREEQC. From my research online, it is clear that this may be an area I can get an answer to my problem! I believe my situation may be a simple one to comment on and fix. As a complete novice to the program I have not written any specific code to review. However, I understand how to enter and define basic solutions from my online research. My colleagues also only have a basic understanding of PHREEQC as it is related to geochemistry and suggested that I get into contact with leading experts knowledgeable in the field of geochemistry. So I am here! At present, I am attempting to model a media solution containing the following compounds: (1) Trizma Base (10g/L) (2) Urea (0.125M) (3) (NH4)2SO4 (0.005M) (4) Yeast Cell Autolysate (10g/L) (5) Trace Metal Addition (Calcium, Magnesium, Zinc, Copper, Iron, Nickel) pH = 8.0 Temperature = 28 degrees celcius My question is: How I would input and model compounds such as Trizma base (2-Amino-2-(hydroxymethyl)-1,3-propanediol), Urea ( (NH3)2CO) as well as amino acids (the Yeast Cell Autolysate being a heterogeneous of phosphate, trace vitamins and surplus amino acid content) into the program? Most especially the amino acids with their reactive ammonium and carboxylic moieties! The penultimate goal is to determine if any of the trace metals I am adding into the media will precipitate, thermodynamically, at the concentrations I intend to add to the media solution (0.01 - 0.20uM). The addition of the trace metals is to see their effect on the growth of a bacterial strain I am working with and if the incorporation of the metals (tested one at a time and in different bacterial flasks and batches) affects the activity of a special enzyme (urease). Thank you for your time and effort in fielding this question, if possible! I hope that the parameters are clear and that an answer could be fielded with little inconvenience or strain on anyone's schedule. Please know that anyone's time and effort are certainly most appreciated! With kindest regards, Justin Whitaker
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