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Dear Mr. Parkhurst,

I have a a problem with phreeqc calculation of alkalinity in strongly acidified mine pit lake water.
The main constituents in well oxygenated surface water are Fe(3)-1.55mM, Al-1.24 mM and S(6)-13mM.
The pH is given with 2.7.
Phreeqc is calculating an alkalinity of -5.88e-03 eq/L. In my opinion this cannot be correct.
Because of the infinite low CO2 concentration the alkalinity (alk) is defined via
alk=-[H+]-aci[Fe-species]-aci[Al-species]-[HSO4-], isn´t it? I´m calculating -8.21e-03 eq/L.

What about your ideas to solve this problem?

Thanks for your time an best regards
Chair for Process System Engineering
Max-Planck-Institute for Dynamics of Complex Technical Systems
Physical and Chemical Process System Engineering
Dr. René Frömmichen

Institute for Chemistry
Universitätsplatz 2
39106 Magdeburg

tel +49 (0)391 67 12594
fax +49 (0)391 67 12223
e-mail rene.froemmichen@xxxxxxxxxxxxxxxxxxxx

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