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PHREEQCi question

Hi there,
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?
Thank you,
Shane Matolyak
MAXIM Technologies, Inc.
PO Box 1413
Bozeman, MT 59771

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