TABLE 4.
Microbial contribution to total Fe(II) oxidation—statistical modelinga
| [O2] (% of air saturation) | [Fe]total (mM) | Fe(II) addition rate (μM h−1) | Fe(II) oxidation rate (μM h−1)
|
% Biotic | |
|---|---|---|---|---|---|
| Total | Biotic | ||||
| 0.5 | 1 | 100 | 71 | 44 | 62 |
| 600 | 493 | 177 | 36 | ||
| 0.5 | 10 | 300b | 257 | 16 | 6 |
| 600 | 511 | 96 | 19 | ||
| 3.0 | 1 | 100 | 97 | 31 | 32 |
| 600 | 519 | 165 | 32 | ||
| 3.0 | 10 | 300b | 284 | 3 | 1 |
| 600 | 537 | 83 | 16 | ||
a
Total and biotic Fe(II) oxidation rates were calculated as described in the text.
b
At Fe(II) addition rates of <300 μM h−1, the modeled biotic oxidation rates with an [Fe]total of 10 mM were negative; under these conditions, the biotic contribution to total Fe(II) oxidation could not be calculated.