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Config → Redox Couples...

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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Config → Redox Couples...

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  1. Config → Redox Couples... Add species to the Basis pane. Decouple any redox species for which analyses in multiple oxidation states are available.

  2. Decouple Fe3+ from Fe2+ and As(OH)4− from AsO43−

  3. 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.

  4. 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.

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