I am simulating an equilibrium for precipitation of struvite and as struvite and also hydroxyapatite may precipitate, I defined them as possible solids, so I get the data for % precipitated. However, when I define hydroxyapatite and Struvite as possible solids The Supersaturation index is kept at 0 and says it is at apparent equilibrium.
The SI value I get is for the final equilibrium right? when I set that these two solids can be formed, when the simulator gets those minerals supersaturated it immediately precipitates the supersaturated amount and redoes the equilibrium right? so basically the value of SI I am getting is what results from the equilibrium of struvite and hydroxyapatite salts being formed and redissolved causing the "apparent equilibrium" right?
What can I do to access the supersaturated indexes of the mixture prior to precipitation? is that what we get when we don't allow solids to precipitate? Is this order to not allow precipitation the same like what would happen if we kept a high mixing speed in the experiment vessel avoiding precipitation? or am I confusing concepts?
I also tried using Phreeqc for this but I don't know how to add Struvite and struvite related minerals to the databases, probably missed it but couldn't find a tutorial to do it and I am a bit afraid of doing it thewrong way and making the databases useless.
Thanks in advance for any help.
If you have both Ca, Mg, NH4 and P in solution, merely don't set EQUILIBRIUM_PHASES at all. Then you will get saturation indices as they are.
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