Tom Meuzelaar Posted May 13, 2008 Share Posted May 13, 2008 [admin notice: the below is from the former GWB users group email distribution list. This message was originally posted 12/5/2005] Posted by: Grant Douglas Dear GWB users, I have a question regarding the modelling of evaporation in React of often highly acidic and saline to hypersaline drainwaters. While I can evaporate and follow the course of salts that precipitate, pH and major ions using the hmw database (and this agrees fairly well with actual evaporation expts), a challenge arises when I want to look at the precipitation of a range of Al- and Fe-based minerals such as alunite, jurbanite and ferrihydrite. Given that these acid drainwaters are shallow and well-mixed I would like to keep CO2 and O2 near atmospheric and Fe trivalent. Given only some elements are available in the hmw, thermo_pitzer and/or other databases, is there a way to build a single database that will cope with the high salinities and also be able to accurately predict the precipitation of various Al- and Fe-containing phases under the acidic and saline conditions? Background information is as follows: GWB 6.0 Pro using React on Windows XP. A simple script to evaporate drainwa! ter to near dryness (simulating natural events) using the hmw database is attached. Many thanks to anyone that can assist. Grant Douglas Posted by: Mark Logsdon HI Grant, A good place to start is Ptacek, CJ and DW Blowes, 2003. Geochemistry of Concentrated Waters at Mine-Waste Sites, in JL Jambor, DW Blowes and AIM Ritchie (Eds) Environmental Aspects of Mine Wastes, Mineralogical Association of Canada, Short Course Series Volume 31, p. 239-252. Drs. Ptacek and Blowes discuss the model-development process and expansion of the databases on pages 242-244. There is an extenisve bibliograpohy, with citations to data sets that you may wish to consider. Hope this helps. Mark Quote Link to comment Share on other sites More sharing options...
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