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GAS_PHASE question



Dear David,
Could you please help me once more?
I wanted to model Calcite dissolution in a closed volume of acidic water in order to check gas pressure change.
I have used the following input file.
 
 
TITLE Calcite dissolution in closed volume of acidic water
SOLUTION 1
  pH 4.0 charge
  Cl 1.0              
  Water 1.0         
 
GAS_PHASE 1
 -fixed_volume
 -pressure 1.0
 -volume 0.00001
 -temperature 25.0
  CO2(g) 1.0
 
REACTION 1
  CaCO3 1.0
  0.0009 moles in 4 steps
 
EQUILIBRIUM_PHASES
 CO2(g) 0.0 0.0

END
 
 
Probably, there is something wrong with the input file, since I don’t get CO2 pressure increase. In addition, when I change a temperature I don’t receive pressure change.
I tried to use equilibration with CaCO3 and got another, but similar result.
What is wrong?
Help, please!
Thank you in advance.
Sincerely,
Michael
--------------------------------------------------
Dr. Michael Zilberbrand
Hydrological Service of Israel
Research Division
P.O.B. 36118, Jerusalem 91360
Israel


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