I looked in phreeqc.dat, wateq4f.dat, llnl.dat, and minteq.dat, and none have analytical expressions for vivianite, nor can I find any instance of the number 234.205 in any of the databases. So I'm confused as to where to locate the error; it looks like it is not in any of the databases that I distribute. 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 Jasper Griffioen <j.griffioen@xxx To: David L Parkhurst <dlpark@xxxxxxxx>, Tony Appelo <appt@xxxxxxxxx> g.tno.nl> cc: In-Reply-To: <3D33DB4C.F418064B@xxxxxxxxxxx> Subject: phreeqc-database 07/16/02 02:37 AM Dear David and Tony, Herewith I would like to ask your attention for a small mistake in the PHREEQC database (and maybe other databases as well). The values for the analytic expression for the solubility of vivianite should read: +234.205 0.0 -12,242.6 -92.510 instead of -234.205 0.0 +12,242.6 +92.510 The reason is presumably that Al-Borno & Tomson (GCA(58/24), 5373-5378) report the analytic expression for pK instead of logK. Best regards, Jasper Griffioen
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