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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
slide2

Config → Redox Couples...

Add species to the Basis pane. Decouple any redox species

for which analyses in multiple oxidation states are available.

slide3

Decouple Fe3+ from Fe2+

and As(OH)4− from AsO43−

slide4

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.

slide5

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.