TABLE 3.
Calculated MMR and average total soluble mercury concentrations in marine sediment incubations
| Prepn | Reactor no. | Time (h) | MMR (ng g−1 h−1)a | Avg total soluble mercury concn (ng liter−1)b |
|---|---|---|---|---|
| Control | 1 | 0–4 | 0.85 | 218.3 |
| 4–8 | 0.71 | 198.4 | ||
| 8–12 | 0.65 | 153.8 | ||
| 12–24 | 0.10 | 92.8 | ||
| 24–36 | 0.11 | 53.3 | ||
| 2 | 0–4 | 0.98 | 169.4 | |
| 4–8 | 0.57 | 113.7 | ||
| 8–12 | 0.43 | 74.7 | ||
| 12–24 | 0.09 | 55.2 | ||
| 24–36 | 0.05 | 49.7 | ||
| 3 | 0–4 | 1.2 | 198.9 | |
| 4–8 | 0.4 | 141.0 | ||
| 8–12 | 0.3 | 88.2 | ||
| 12–24 | 0.08 | 56.0 | ||
| 24–36 | −0.04 | 51.7 | ||
| 4 | 0–4 | 0.7 | 184.0 | |
| 4–8 | 0.8 | 135 | ||
| 8–12 | 0.6 | 83.7 | ||
| 12–24 | 0.1 | 57.4 | ||
| 24–36 | −0.05 | 47.5 | ||
| Lactate amended | 1 | 0–4 | 9.7 | 237.7 |
| 4–8 | 5.0 | 195.6 | ||
| 8–12 | 7.8 | 96.4 | ||
| 12–24 | 0.7 | 62.7 | ||
| 24–36 | −1.0 | 68.4 | ||
| 2 | 0–4 | 6.9 | 207.3 | |
| 4–8 | 4.8 | 147.0 | ||
| 8–12 | 6.0 | 93.7 | ||
| 12–24 | 3.7 | 60.6 | ||
| 24–36 | 0.9 | 49.5 | ||
| 3 | 0–4 | 4.5 | 201.6 | |
| 4–8 | 5.5 | 169.6 | ||
| 8–12 | 3.5 | 131.0 | ||
| 12–24 | 2.3 | 96.1 | ||
| 24–36 | 1.0 | 68.8 | ||
| Acetate amended | 1 | 0–4 | 13.0 | 237.7 |
| 4–8 | 12.5 | 195.6 | ||
| 8–12 | 8.5 | 141.3 | ||
| 12–24 | 2.8 | 89.9 | ||
| 24–36 | 0.6 | 62.3 | ||
| 2 | 0–4 | 15.0 | 226.7 | |
| 4–8 | 13.5 | 176.8 | ||
| 8–12 | 4.0 | 135.9 | ||
| 12–24 | 1.1 | 98.8 | ||
| 24–36 | 0.7 | 58.4 | ||
| 3 | 0–4 | 10.4 | 165.3 | |
| 4–8 | 10.4 | 115.3 | ||
| 8–12 | 9.1 | 104.0 | ||
| 12–24 | 1.7 | 84.6 | ||
| 24–36 | 1.54 | 51.0 |
a
MMR were calculated by subtracting the methylmercury concentrations measured at the beginning of the time interval from the concentration measured at the end of the time interval and then normalizing by the duration of time that had elapsed between measurements.
b
Soluble mercury concentrations were calculated by averaging the soluble mercury concentrations determined at the beginning and end of each time interval.