PhreeqcUsers Discussion Forum

Processes => Mixing => Topic started by: Sergio on May 12, 2017, 01:53:40 PM

Title: Mix sample solid
Post by: Sergio on May 12, 2017, 01:53:40 PM
Good morning everyone
Let me ask you about a mix of a sample solid and I inform the PHREQC the concentration.
My ask is: this concentration is the mass of solid that I have in my sample (20 % converted in ppm) or I have to inform the concentration of solubilized (0,2 ppm in aqueous after solubilization or leaching)).
When PHREEQC give me the answer (0,2e-3 molality) it considers the equilibrium constant or I have to inform it the constant.
thanks so much
Title: Re: Mix sample solid
Post by: dlparkhurst on May 12, 2017, 03:40:17 PM
The number of moles of a solid mineral available to react is defined in EQUILIBRIUM_PHASES.

If you then allow the EQUILIBRIUM_PHASES to react with a solution

USE solution 1
USE equilibrium_phase 1

Then the mineral will dissolve (or precipitate) to achieve equilibrium. This calculation uses the equilibrium constant for the mineral that is defined in a PHASES data block and produces the condition


where IAP is the ion activity product. The PHASES data block may be in the database, or you can include it in the input file.