Mr. Parkhurst: Hi, how are you ! I am very appreciated of your help on my question last time . I don't know if you had time to think over the question on caron dioxide. I remembered that you said you were out of town for two weeks. I sent a email to you then and i am not sure if you got it. So I here sum it up in this way: I am trying to simulate the disolution of the gas composition of air in solution which is bubbled with a humidified air in lab experimental condition. The concentration of carbonate is unknown. I tried to set the initial data in GAS_PHASE 1 Air -fixed_pressure -pressure 1.0 -temperature 25.0 CO2(g) 0.000316 O2(g) 0.2 N2(g) 0.78 as well as EQUILIBRIUM_PHASES 1 Fix_H+ -8.0 NaOH 10.0 CO2(g) -3.5 O2(g) -0.69897 N2(g) -0.1079 The pH are set as fixed from 2-10. There are 1 mg/l U in the soultion and adsortion by iron oxide are allowed too. The first one comes out with the carbonate distribution as shown in attached file while the second one doesn't converge. I tried the KNOBS data but didn't work. Butwhen I took away the O2(g) and N2(g) from the data set, it gave a fairly good result. Here is my questions: 1. which one data set should i use to represent the experimental condition ? 2. I used the Fixed_H+ for constant pH. In order to keep the acid-base and calculation balance, I need to assumed some acid or base present as Manual recommended. Don't they influence the chemical reaction, such as to increase or decrease the dissolution of CO2 ? how to avoid using the assumed acid or base ? Any advices if necessary? Thanks a lot for your precious time and help. Yours sincerely, Young Wang Department of Geology SUNY-Binghamton
Description: MS-Word document
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 2009 since Jan 22, 1998.