Table 1.
Biogeochemical characteristics of anoxic sediments from anthropogenic aquatic habitats.
| Habitat | Tailings Pond (West In-Pit) |
Stratified Reservoir (Hassel Pre-Dam) |
Acidic Pit Lake (ML 111) |
|---|---|---|---|
| Location | Fort McMurray, AB, Canada |
Hasselfelde, Germany |
Lauchhammer, Germany |
| Depth of tailings/water column at sampling site [m] | 12 | 12 | 10.2 |
| Chemistry | |||
| pH | 7.5–8.5 | 7.2–8.0 | 2.6 |
| DOC [mg L−1] | 79 | 8.4–13.2 [25] | 36–78 [26] |
| NH4-N [mg L−1] | 2.26 | 2.5–5.6 [*] | 2.5–4.3 [27] |
| NO3-N [mg L−1] | <0.04 | <0.04 | 2.5–4.3 [27] |
| SO42− [mg L−1] | 6.08 | 19.8 | 1412 |
| H2S [mmol L−1] | <0.01 | n.a. | 0 [28] |
| Total reactive iron [mg L−1] | 3158 | 1786–4576 [25] | 1396–12,566 [26] |
| Ferrous iron [mg L−1] | 3272 | 1786–3627 [25] | 1396–10,053 [26] |
| Dissolved iron [mg L−1] | 0.07 | 3.9–13.8 [25] | 363 [26] |
| Microbiology | |||
| SOB MPN [cells mL−1] | 5.4 × 107 | 1.6 × 105 | 1.7 × 105 |
| Thiosulfate oxidation potentials | |||
| Aerobic [mmol L−1 d−1] | 1.21 | 0.81 | 0.24 (pH 6) |
| 0.15 (pH 4) | |||
| Anaerobic [mmol L−1 d−1] | 0.09 | n.a. | n.a. |
| Anaerobic + KNO3 [mmol L−1 d−1] | 0.23 | 0.24 | 0.15 (pH 6) |
| 0.05 (pH 4) |
n.a. not analyzed. * Kurt Friese; personal communication.