[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

question about PHREEQC

----- Forwarded by Michele Y Crouse/WRD/USGS/DOI on 06/12/01 07:45 a.m.
                      Daniel Emilio                                                          
                      Martínez                 To:      h2osoft@xxxxxxxx                     
                      <demarti@xxxxxxx         cc:                                           
                      .ar>                     Subject: question about PHREEQC               
                      06/11/01 05:50                                                         

Dear Mr.:

I'd like to make a question about the User's Guide of PHREEQC2.0,
specifically about the Example 11. This example is, acording the User's
Guide, derived from a sample calculation of the program PHREEQM (Appelo and
Postma, example 10.13, p. 431-434).
In page 239, line 9, the user's guide said "the number of exchange sites in
each cell is 1.1 mmol", which is according with the keyword data block
intructions given at page 82. Nevertheless, the referred PHREEQM example
states a CEC of 1.1 meq/L of pore water.
My question is: the nunmber of exchange sites must be given in mol or in
meq/L as in PHREEQM? and if the first is correct: it is claire how to
transform the measured CEC in meq/100 g of soil to meq/L of solution
(Appelo and Postma, 1993, Example 5.1. p.149), but, how can I make the
recalculation from meq/100 g soil to mol as requested in PHREEQC?
Thank you very much for your assistance.
Yours sincerely

Dr. Daniel Emilio Martínez
Centro de Geología de Costas y del Cuaternario
CC 722 - 7600 Mar del Plata
T.E. 0223 475 4060

Project Home Page
Complete Water Resources Division Software
USGS Home Page
Water Resources Division Home Page
NRP Home Page
Help Page
USGS Privacy Statement       

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: https://wwwbrr.cr.usgs.gov/projects/GWC_coupled/phreeqc/mail/msg00256.html
Last modified: $Date: 2005-09-13 21:04:21 -0600 (Tue, 13 Sep 2005) $
Visitor number 2770 since Jan 22, 1998.