DATABASE C:\Program Files\USGS\Phreeqc Interactive 2.6\phreeqc.dat
# R.11. Exercise
SOLUTION 1 Pure Water
SOLUTION 2
    temp      25
    pH        8.22
    pe        8.45
    redox     pe
    units     ppm
    density   1
    Ca        412.3
    Mg        1291.8
    Na        10768
    K         399.1
    Alkalinity 141.682 as HCO3
    Cl        19353
    S(6)      2712
    -water    1 # kg
END
MIX 2
	1	.5
	2	.5
EQUILIBRIUM 2
	O2(g)	-.7	10
SAVE solution 3
SELECTED_OUTPUT
	-file ch2o.sel
	-reset false
	-rxn
	-totals  O(0) C(4) C(-4) Fe(3) Fe(2) S(6) S(-2)
	-equilibrium_phases	mackinawite
END
USE solution 3
EQUILIBRIUM_PHASES 3
	Fe(OH)3(a)	0	0.1
	Mackinawite 0	0
REACTION
	CH2O	1.0
	NH3	0.1
	.1 .2 10 20 30 40 50 mmol
END