Fe-As Predominance

This example is from Phreeplot manual (Kinniburgh, D., & Cooper, D. (2011). PhreePlot: Creating graphical output with PHREEQC).

Studies

This project contains 6 Studies.

Db used: “wateq4f_dat” database

PHASES

Fix_H+

    H+ = H+

   log_k 0.0

SOLUTION 1

    temp 25

    pH 1.8

    units mol/kgw

    S(6) 5e-3

    Fe 5e-3

    As 1e-2

    Na 1e-1

    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

    CO2(g) -3.5 10

	Realgar 0 0

	Orpiment 0 0

	As2S3(am) 0 0

	Halite 0 0

	Arsenolite 0 0

	Claudetite 0 0

	Pyrite 0 0

	Mackinawite 0 0

	FeS(ppt) 0 0

	Sulfur 0 0

	Fe(OH)2.7Cl.3 0 0

	# Goethite 0 0

	Fe(OH)3(a) 0 0

	# Hematite 0 0

	Greigite 0 0

	Magnetite 0 0

	Nahcolite 0 0

	Siderite 0 0

	Maghemite 0 0

	Siderite(d)(3) 0 0

	Scorodite 0 0

	Natron 0 0

	Thermonatrite 0 0

	Fe3(OH)8 0 0

	Thenardite 0 0

	Melanterite 0 0

	Mirabilite 0 0

	As2O5(cr) 0 0

	Trona 0 0

	Jarosite-Na 0 0

	JarositeH 0 0

END

/n

Db used: “wateq4f_dat” database

PHASES

Fix_H+

    H+ = H+

   log_k 0.0

SOLUTION 1

	pH 1.8 # start at a low pH (less than xmin)

	units mol/kgw

	Fe(3) 1e-1

	Na 1e-1

	Cl 1e-1

	As 1e-2 # total As

END

# second simulation

USE solution 1

EQUILIBRIUM_PHASES 1

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

        -force_equality true

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

	Fe(OH)3(a) 0 0 # but no adsorbed As

	Arsenolite 0 0 # possible As minerals

	Claudetite 0 0

	Scorodite 0 0

	As2O5(cr) 0 0

END

/n

Db used: “wateq4f_dat” database

PHASES

Fix_H+

    H+ = H+

   log_k 0.0

SOLUTION 1

	pH 1.8 # start at a low pH (less than xmin)

	units mol/kgw

	Fe(3) 1e-1

	Na 1e-1

	Cl 1e-1

	As 1e-2 # total As

END

# second simulation

USE solution 1

# standard Hfo block (consistent with Dzombak and Morel's HFO)

SURFACE 1

    Hfo_sOH Fe(OH)3(a)      equilibrium_phase 0.005  53300

    Hfo_wOH Fe(OH)3(a)      equilibrium_phase 0.2

EQUILIBRIUM_PHASES 1

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

        -force_equality true

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

	Fe(OH)3(a) 0 0 # but no adsorbed As

	Arsenolite 0 0 # possible As minerals

	Claudetite 0 0

	Scorodite 0 0

	As2O5(cr) 0 0

END

/n

This project contains 3 Plots.