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
René
--
--------------------------------------------------------------
Otto-von-Guericke-University
Chair for Process System Engineering
Max-Planck-Institute for Dynamics of Complex Technical Systems
Physical and Chemical Process System Engineering
Dr. René Frömmichen
c/o
Institute for Chemistry
Universitätsplatz 2
39106 Magdeburg
Germany
tel +49 (0)391 67 12594
fax +49 (0)391 67 12223
e-mail rene.froemmichen@xxxxxxxxxxxxxxxxxxxx
froemmic@xxxxxxxxxxxxxxxxxxxx
--------------------------------------------------------------
Please note that some U.S. Geological Survey (USGS) information accessed through this page may be preliminary in nature and presented prior to final review and approval by the Director of the USGS. This information is provided with the understanding that it is not guaranteed to be correct or complete and conclusions drawn from such information are the sole responsibility of the user.
Any use of trade, product, or firm names in this publication is for descriptive purposes only and does not imply endorsement by the U.S. Government.
The URL of this page is:
https://wwwbrr.cr.usgs.gov/projects/GWC_coupled/phreeqc/mail/msg00448.html
Email:dlpark@usgs.gov
Last modified: $Date: 2005-09-13 21:04:21 -0600 (Tue, 13 Sep 2005) $
Visitor number [an error occurred while processing this directive] since Jan 22, 1998.