Sounds like something in your formulation is inconsistent. One example would be Cl decreasing from solution 1 to solution 2, halite is the Cl source, but halite is required to dissolve. Look through each element and consider whether it increases or decreases and whether there is a mineral that is a possible source or sink for each element. Another place to look is with redox. If redox is involved, try adding O2(g) as a reactant that can dissolve or precipitate and see if that points the way to your problem. If you send me the input file, I'll try to take a look. David David Parkhurst (dlpark@xxxxxxxx) U.S. Geological Survey Box 25046, MS 413 Denver Federal Center Denver, CO 80225 h2osoft Sent by: Michele To: David L Parkhurst/WRD/USGS/DOI@xxxx Y Crouse cc: gs-w_h2osoft@xxxxxxxx In-Reply-To: <OF3D9E807B.DAF3204F-ON85256A30.00616249@xxxxxxxx> Subject: problems with uncertainty term in inverse model 04/16/01 10:45 AM ----- Forwarded by Michele Y Crouse/WRD/USGS/DOI on 04/16/01 01:43 p.m. ----- "Barbara Coto Suarez" To: h2osoft@xxxxxxxx <barbarapiri@xxx cc: In-Reply-To: <OF3D9E807B.DAF3204F-ON85256A30.00616249@xxxxxxxx> mail.com> Subject: 04/16/01 01:34 p.m. Hello. I am a Spanish student working with Phreeqc. I am trying to do an inverse modelling and I have problems with the uncertainty term, I am not able to run the program unless I specify a value of 1, and this means a really big error. Can you please give me any advise about this?. I can send you my input file if you need it. Thank you very much. Barbara Coto Suarez Tu correo gratis en MixMail http://www.mixmail.com Ayudanos a ganar los iBest! http://www.ya.com/ibest
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