TABLE 1.
Redox couple | Oxidation state | Half-reaction | E0′ (V)a |
---|---|---|---|
O2/H2O | 0/−2 | O2 + 4e− + 4H+ → 2H2O | +0.81 |
NO3−/N2 | +5/0 | 2NO3− + 10e− + 12H+ → N2 + 6H2O | +0.75 |
MnO2/Mn2+ | +4/+2 | MnO2 + 2e− + 4H+ → Mn2+ + 2H2O | +0.53 |
SeO42−/SeO32− | +6/+4 | SeO42− + 2e− + 2H+ → SeO32− + H2O | +0.48 |
NO3−/NH4+ | +5/−3 | NO3− + 8e− + 10H+ → NH4+ + 3H2O | +0.36 |
SeO32−/Se0 | +4/0 | SeO32− + 4e− + 6H+ → S0 + 3H2O | +0.21 |
Fe3+/Fe2+ | +3/+2 | Fe(OH)3 + 1e− + 3H+ → Fe2+ + 3H2O | +0.10 |
SO42−/SO32− | +6/+4 | SO42− + 2e− + 2H+ → SO32− + H2O | −0.516 |
Se0/HSe− | 0/−2 | Se0 + 2e− + H+ → HSe− | −0.73 |