----- 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; SOLUTION 1 temp 25.0 pH 7 pe 4 redox pe units mg/kgw GAS_PHASE 1 -pressure 1 -volume 1 -temperature 25 CO2(g) 0.00035 END 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, Mr. KAORU MASUDA Kobe Steel, Ltd. 1-5-5, Takatsuka-dai Nishi-ku Kobe 651-2271 JAPAN Tel Japan-78-992-5733 Fax Japan-78-992-5547
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:
Last modified: $Date: 2005-09-13 21:04:21 -0600 (Tue, 13 Sep 2005) $
Visitor number 1223 since Jan 22, 1998.