As-O₂-H₂O Predominance

This example corresponds to the an example from Phreeplot manual (Kinniburgh, D., & Cooper, D. (2011). PhreePlot: Creating graphical output with PHREEQC). See the Phreeplot Website for more info.

In this example the system As-O2-H2O is analysed for predominance but also for sub-predominance species.

Studies

This project contains 2 Studies.

PhreeqcStudy: “study_01 - As-O2-H2O System”

Db used: “wateq4f_dat” database

PHASES

Fix_H+

   H+ = H+

   log_k 0.0

SOLUTION 1

	temp 20

	units mol/kgw

	As 1e-3 # total As

	Na 1e-1 # background electrolyte

	Cl 1e-1 charge

END

USE solution 1

EQUILIBRIUM_PHASES 1

   Fix_H+ @{$-1*ph_param$}@ NaOH 10

     -force_equality true

   O2(g)  @{$o2_pressure$}@ 0.1

END

/n

GridStudy: “Grid Study”

Plots

This project contains 2 Plots.

Plot 1: “Dominant species (ex 8)”

Plot 2: “Sub-dominant species (ex 9)”