Dear David Parkhurst, In the PHREEQC database there is two equations for CaCO3: Ca+2 + CO3-2 = CaCO3 log_k 3.224 Calcite CaCO3 = CO3-2 + Ca+2 log_k -8.480 Which one of the equilibrium constants is used by PHREEQC to calculate the solubility constant? If both this constants are used doesn't the model became unstable. Best Regards Pedro Chambel Leitão ~~~~~~~~~~~~~~~~~~~~~~~~~~ IST - MARETEC Taguspark Núcleo Central, Sala 363 2780-920 Oeiras, Portugal Tel.: +351 21 4239016 Fax: +351 21 4211272 URL: http://www.mohid.com
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:
Last modified: $Date: 2005-09-13 21:04:21 -0600 (Tue, 13 Sep 2005) $
Visitor number 1490 since Jan 22, 1998.