With this message, I am forwarding your questions to the author of PHREEQC. With respect to documentation for PHRQPITZ, see http://water.usgs.gov/software/ordering_documentation.html for information on how to order: Plummer, L.N., Parkhurst, D.L., Fleming, G.W., and Dunkle, S.A., 1988, A computer program incorporating Pitzer's equations for calculation of geochemical reactions in brines: U.S. Geological Survey Water-Resources Investigations Report 88-4153, 310 p. There is an additional article on PHRQPITZ which should be available in many libraries: Plummer, L.N., and Parkhurst, D.L., 1990, Application of the Pitzer Equations to the PHREEQE geochemical model, in Melchior, D.C., and Bassett, R.L., eds., Chemical modeling of aqueous systems II: American Chemical Society Symposium Series 416, Washington, D.C., American Chemical Society, p. 128-137. Michele Crouse U.S. Geological Survey Hydrologic Analysis Software Support Program h2osoft@xxxxxxxx "Natschke, David" To: h2osoft@xxxxxxxx <DNatschke@xxxxx cc: is-us.com> Subject: Questions regarding some PHREEQC output 07/23/01 01:03 p.m. Hello, again, I am writing this time regarding PHREEQC rather than PHRQPITZ 1. I have a data set for injection well disposal. Two aqueous streams are mixed together and then injected. In the attached file, CoolingTowerMixA.out, the calculated errors for solution 2 are rather large, >20%. Does a calculated error this large suggest problems? I am particularly concerned with the high calculated pH value. Were this to be significantly in error all of the calculated saturation indices would be in question. 2. later on in the process I will be equilibrating the mixed stream with the existing groundwater, which has a TDS of 34,000 mg/L with chloride 18,000 mg/L and sodium of 11,000 mg/L Will PHREEQC handle this groundwater? As opposed to PHRQPITZ? Without documentation for PHRQPITZ PHREEQC is proving a lot easier to deal with. -----Original Message----- From: h2osoft@xxxxxxxx [mailto:h2osoft@xxxxxxxx] Sent: Thursday, June 28, 2001 12:52 PM To: Natschke, David Cc: h2osoft@xxxxxxxx Subject: RE: FW: PHRQPITZ citations and test data sets (See attached file: CoolingTowerMixA)(See attached file: coolingTowerMixA.out)
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