| Oxidation/reduction pairs |
Eo (mV) |
| H+/H2 |
-420 |
| NAD+/NADH |
-320 |
| So/HS- |
-320 |
| SO42-/H2S |
-320 |
| Pyruvate2-/Lactate2- |
-185 |
| 2,6-AQDS/2,6-AHQDS |
-184 |
| FAD/FADH2 |
-180 |
| Menaquinione ox/red |
-75 |
| Pyocyanin ox/red |
-34 |
| Humic substances ox/red |
-200 to +300 |
| Methylene blue ox/red |
+11 |
| Fumarate2-/Succinate2- |
+31 |
| Thionine ox/red |
+64 |
| Cytochrome b(Fe3+)/Cytochrome b(Fe2+) |
+75 |
| Fe(III) EDTA/Fe(II) EDTA |
+96 |
| Ubiquinone ox/red |
+113 |
| Cytochrome c(Fe3+)/Cytochrome c(Fe2+) |
+254 |
| O2/H2O2 |
+275 |
| Fe(III) citrate/Fe(II) citrate |
+372 |
| Fe(III) NTA/Fe(II) NTA |
+385 |
| NO3-/NO2- |
+421 |
| Fe(CN)63-/Fe(CN)6-4 |
+430 |
| NO2-/NH4+ |
+440 |
| O2/H2O |
+820 |
