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

Question about PHREEQCI

----- Forwarded by Michele Y Crouse/WRD/USGS/DOI on 08/06/01 01:04 p.m.
                      "Kaoru Masuda"                                                                
                      <k-masuda@xxxxxxxxxxx         To:      <h2osoft@xxxxxxxx>                     
                      elco.co.jp>                   cc:      <seik@xxxxxxxxxxxxxxxxxx>              
                                                    Subject: Question about PHREEQCI                
                      08/05/01 11:42 p.m.                                                           

Dear Sir,

I am a user of PHREEQC interactive.  And I have some questions
about the calculation.
Would you please transfer this e-mail to someone who knows it well?

I want to calculate CO2 gas dissolution into water solution.
For example, If 350ppmV-CO2 gas phase exists with a solution of pH=7,
I think that the *.in file must be as follows;

 temp 25.0
 pH 7
 pe 4
 redox pe
 units mg/kgw
 -pressure      1
 -volume        1
 -temperature   25
 CO2(g) 0.00035

The result of the calculation with abobve *.in file shows that
total C in the solution is 1.4E-5 mol/L and pH is 5.6.
I think this result is reasonable.
However, by replacing the volume to 1000 instead of 1, the
result shows that total C is  1.4E-2 and pH=4.1.
On the other hand, by replacing pressure value to 1000 instead of 1.
total C is 1.4e-5 and pH=5.6.
I think that the solubility has not be changed with volume
by Henry's Law.
Do I have some misunderstanding about this ?

Please give me some comments about it.

Yours Sincerly,

Kobe Steel, Ltd.
1-5-5, Takatsuka-dai Nishi-ku
Kobe 651-2271
Tel  Japan-78-992-5733
Fax Japan-78-992-5547

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/msg00287.html
Last modified: $Date: 2005-09-13 21:04:21 -0600 (Tue, 13 Sep 2005) $
Visitor number [an error occurred while processing this directive] since Jan 22, 1998.