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Re: problems with uncertainty term in inverse model

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 Parkhurst (dlpark@xxxxxxxx)
U.S. Geological Survey
Box 25046, MS 413
Denver Federal Center
Denver, CO 80225

                      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                                                                                         

----- 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                                                                                         

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

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