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.
Why could that be and is will this allow me to select Se and specify it's concentration in the Solution data block?
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