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Alkaline Solutions and CO2



I had a query with regards to alkaline (pH 10) solutions and CO2. I have a solution whose composition is listed below and I am bubbling CO2 through the solution. I want to see how long at a given flow rate (x litres of CO2) before I have the precipitation of a certain amount of CaCO3. I can't seem to get the output right no matter what I try. I need to keep the pH constant for the entire reaction. Is the following code correct for what I am doing?


SOLUTION 1 Nutrient Solution, pH 10, No CO2
temp 30
pH 10
pe 4
redox pe
units umol/kgw
density 1
B 0.16
Ca 700
Cl 256 charge
K 133
Mg 133
Na 0
N(-3) 47
N(5) 423
P 3
Zn 0.1
Cu 0.04
Fe 5
Mn 0.2
S(6) 500
C 0.000005
-water 1 # kg

GAS_PHASE 1 CO2 addition
-fixed_volume
-pressure 1
-volume 100
-temperature 30
CO2(g) 0.78035
O2(g) 0.21965

Also when I increase the pH, it returns lots of errors. Any help you can give would be great.
 
Thanks,
 
 
Peter Kopittke


___________________________________
Peter Kopittke
Centre for Mined Land Rehabilitation
School of Land and Food Sciences
University of Queensland,
Brisbane, QLD, AUSTRALIA, 4072.
61-7-3365 7341


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