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SED & PREDOM / PREDOM |
A predominance area diagram shows the species formed with a given
A special type of predominance area diagram is the potential-pH diagram,
also called a Pourbaix diagram. The following figure shows a
potential-pH diagram
This diagram was obtained with the following input file:
3, 13, 7, 0
H+, e-, Fe 2+
Fe 3+ ,-13.02 0 -1 1, Fe(OH)2 ,-20.8 -2 0 1
Fe(OH)3- ,-33.4 -3 0 1, Fe(OH)4 2-,-46.35 -4 0 1
FeOH+ ,-10.2 -1 0 1, OH- ,-14.0 -1 0 0
Fe(OH)2+ ,-18.69 -2 -1 1, Fe(OH)3 ,-25.58 -3 -1 1
Fe(OH)4- ,-34.62 -4 -1 1, Fe2(OH)2+4,-28.99 -2 -2 2
Fe3(OH)4+5,-45.36 -4 -3 3, FeO4 2- ,-125.87 -8 -4 1
FeOH 2+ ,-15.21 -1 -1 1,
Fe(c) ,-16.097 0 2 1, Fe(OH)2(c), -12.996 -2 0 1
Fe3O4(c) ,-37.077 -8 -2 3, Fe(OH)3(am),-17.911 -3 -1 1
Fe2O3(cr) ,-26.448 -6 -2 2, Fe3(OH)8(c),-46.262 -8 -2 3
FeOOH(cr) ,-14.02 -3 -1 1
EH, e-, H+, Fe 2+,
LAV, 0 -13, LAV, 16.9034 -18.5937, T, 1E-5