----- 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
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