[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

Mn species

Dear David

currently I am trying to model black Sea seawater speciation using phreeqc, latest edition, and I got a question:
I`d like to introduce MnS-Species to the database, but cannot find log_k values and delta_h values for the complex MnS(HS)- and the preciptitation of MnS2. Well, I do find a log_K for MnS(HS)- of +37.25 in
Landing, W.M. and Lewis, B.L., 1991. Thermodynamic modelling of trace metal speciation in the Black Sea. In: E. Izdar and J.W. Murray (Editors), Black Sea Oceanography. NATO ASI Series C. Kluwer Academic Publishers, Dordrecht, pp. 125-160.

But this value seems rather high to me. Putting this in the database, all the solute Mn is in this MnS(HS)- species, and all others are negligible, which seems not to be right to me.

Do you have any idea how to find the log_k and delta_h values?
I would be greatful for any hint.

Regards Andreas Huebner

Dr. Andreas Hübner FREIE UNIVERSITÄT BERLIN Institut für Geologie, Geophysik und Geoinformatik Fachrichtung Geochemie, Hydrogeologie, Mineralogie Malteserstr. 74 - 100, Haus B, D-12249 Berlin Tel: (49 30) 83870 808 Fax: (49 30) 83870 738 E-Mail: ahb@xxxxxxxxxxxxxxxxxx

Project Home Page
Complete Water Resources Division Software
USGS Home Page
Water Resources Division Home Page
NRP Home Page
Help Page
USGS Privacy Statement       

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/msg00063.html
Last modified: $Date: 2005-09-13 21:04:21 -0600 (Tue, 13 Sep 2005) $
Visitor number 2470 since Jan 22, 1998.