TABLE 1.
Culture | Concn (ng liter−1)
|
Turnover | Fraction of spike methylated | |
---|---|---|---|---|
Unfiltered MeHg | Filtered HgI | |||
Ambient A | 67.8 | 76.9 | 0.88 | 0.034 |
Ambient B | 71.9 | 67.6 | 1.06 | 0.036 |
Avg ± SE | 0.97 ± 0.09 | 0.035 ± 0.001 | ||
Sulfide + A | 10.0 | 13.3 | 0.75 | 0.005 |
Sulfide + B | 11.2 | 20.0 | 0.56 | 0.006 |
Avg ± SE | 0.65 ± 0.10 | 0.005 ± 0.0003 |
Sulfide concentrations were 0.55 mM in ambient cultures and 1.4 mM in sulfide+ cultures; spike concentration was 2,000 ng Hg liter−1. Turnover = [unfiltered MeHg]/[filtered HgI]; fraction methylated = [unfiltered MeHg]/[spike HgI].