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Config → Redox Couples... - PowerPoint PPT Presentation
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Config → Redox Couples. Add species to the Basis pane. Decouple any redox species for which analyses in multiple oxidation states are available. Decouple Fe 3+ from Fe 2+ and As(OH) 4 − from AsO 4 3 −. e − is swapped in for O 2 (aq), then Eh is
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Presentation Transcript
Add species to the Basis pane. Decouple any redox species
for which analyses in multiple oxidation states are available.
and As(OH)4− from AsO43−
e−is swapped in for O2(aq), then Eh is
set in volts. This value will control redox
state of all redox pairs prescribed to be
in equilibrium (HCO3- and SO42− species).
Fe3+ and AsO43− are added to the
basis and constraints set to calculate
redox state independently.
First value listed is system Eh
Redox state for As(OH)4−/AsO43− and Fe3+/Fe2+
pairs are computed using Nernst equation.
Widely varying Eh values indicate system
has not reached redox equilibrium.
