PHREEQC uses an ion-association model, which is not reliable the high ionic strengths that you need. The Pitzer specific interaction model works to higher ionic strengths, but most implementations do not include NH3 and the temperature corrections may not be very good. You could check specific Pitzer implementations, which include EQ3/6, Geochemists Work Bench, Solemneq, and Tequil. PHRQPITZ is an old Geological Survey code, that is pretty difficult to use and does not have data for ammonia. David David Parkhurst (dlpark@xxxxxxxx) U.S. Geological Survey Box 25046, MS 413 Denver Federal Center Denver, CO 80225 Project web page: https://wwwbrr.cr.usgs.gov/projects/GWC_coupled Bassetto Giuseppe To: dlpark@xxxxxxxx, h2osoft@xxxxxxxx <basgiu@xxxxxxx> cc: In-Reply-To: <F1CAF31E06E7D4119FB20060976E0A7409BB0F@xxxxxxxxxxxxx> Subject: Information request 04/23/02 11:27 PM Dear Sirs, my name is Giuseppe Bassetto and I am an Italian engineer. Sometime ago I heard about your software named "PHREEQC". I downloaded the version 1.5.08 from the site https://wwwbrr.cr.usgs.gov/projects/GWC_coupled/phreeqc <http://therion.minpet.inibas.ch/minpet/groups/theriak/theruser.html> . I would like to ask you if, by this software , I am able to understand what happen, during coolig, at system composed by 100 gr of water, 100 gr of CaCl2 (by these wheigts I have the composition of the CaCl2.6H2O roughly) and 10 gr of NH3, starting coolig at 40°C. In the binary system composed by H2O and CaCl2 at 30 °C roughly I have the precipitation of CaCl2.6H2O. The presence of ammonia will allow the precipiation of CaCl2.6H20 at 30°C or not? If not what will it happen? Thank you very much for your time. Best regards Giuseppe Bassetto V. Calderai, 6 31010 Cimadolmo (TV) Italy
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