> I'm new to the world of chemistry modelling and am about to use PHREEQCi to speciate Mn and Se in surface water runoff. When I go to the Solution input data block Se is not listed as a possible master species. I realized that Se is not in the PHREEQC database and attempted to change the default database to Minteq.dat using the Options tab. However, when I do this I am not able to apply the new setting. The way it works is a little confusing, but go to File->properties to set the new database file for the current file. Once that is done, all of the elements from the new database file should be available through the SOLUTION screen input. You also pick a database file when you run the input file. Options will set the default database for any File->new input data files or other file->open input files that do not have a DATABASE keyword. David David Parkhurst (dlpark@xxxxxxxx) U.S. Geological Survey Box 25046, MS 413 Denver Federal Center Denver, CO 80225 Project web page: https://wwwbrr.cr.usgs.gov/projects/GWC_coupled
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