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Redox Species Configuration in.volts

Configure redox couples, decouple species for multi-oxidation states, set Eh in volts to control system redox state equilibrium. Calculate redox state independently for Fe and As species using Nernst equation.

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Redox Species Configuration in.volts

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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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