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AqQA CO3 Concentrations from Alkalinity (CaCO3)

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Does anyone know how to derive CO3 concentrations from alkalinity (CaCO3), ph, and temperature in AqQA? I was told that the program could derive this information based on these variables. I would really appreciate any help.


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Hi cMol1893,

The AqQA help topic Carbonate Equilibria states that you can use Speciation to calculate CO3.


Tom B
RockWare Inc

Carbonate Equilibria
The Carbonate Equilibria category show the speciation among carbonate ions in solution, and various factors that depend on the speciation. For details of how these calculations are performed, see Appendix: Carbonate Equilibria.
Dissolved carbonate is distributed among the carbonate and bicarbonate ions (CO32- and HCO3-) and aqueous carbon dioxide (CO2(aq)). In order for Aq•QA to figure the species distribution, the following conditions must be met for the sample:
1. The pH must be specified.
2. At least one measure of carbonate concentration must be specified. This may be (A) the concentration of one of the inorganic analytes bicarbonate, ( B ) carbonate, or carbon dioxide, (the carbon concentration [C], or (C) the titration alkalinity.
3. Temperature, which is set to 25°C if not specified, must fall in the range 0°C –300°C. (Note that in the range 100°C–300°C, it is necessary to specify fluid density directly, to avoid possibly significant calculation errors when converting units.)
If these conditions are met, the following information will appear:

The program reports the predicted distribution of carbonate among the three carbonate species: HCO3-, CO32-, and CO2.

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