TABLE 2.
Decreases of Fe(II) and NO3− concentrations and rates and stoichiometries of Fe(II) oxidation, Fe(III) reduction, and NO3− reduction in the two phases of the microcosm experiment with sediment from Norsminde Fjord
| Parameter | Value for expt |
|||
|---|---|---|---|---|
| Phase 1 |
Phase 2 | |||
| Cycle 1 | Cycle 2 | Cycle 3 | ||
| Decrease of Fe(II) concn (mM) | 3.15 | 1.98 | 2.59 | 3.20 |
| Decrease of Fe(III) concn (mM) | 1.79 | 2.41 | —a | —a |
| Decrease of NO3− concn (mM) | 3.87 | 3.69 (−1.74b) | 1.16 | 0.90 |
| Rate of Fe(II) oxidation (mM day−1) | 0.26 | 0.15 | 0.19 | 0.23 |
| Rate of Fe(III) reduction (mM day−1) | 0.16 | 0.18 | —a | —a |
| Rate of NO3− reduction (mM day−1) | 0.31 | 0.14 | 0.083 | 0.064 |
| Stoichiometry of NO3−reduced/Fe(II)oxidized | 1.23 | 0.89 | 0.44 | 0.28 |
a
No Fe(III) reduction was measured.
b
Amount of nitrate that was reduced while Fe(II) was oxidized.