Table 2. In situ ∑H2S measurements compensated for a range of hydrothermally relevant pH.
| pH | Chowder Hill H2S (mℳ) | Dead Dog H2S (mℳ) | Needles H2S (mℳ) |
|---|---|---|---|
| Not pH compensateda | 3.91 | 2.10 | 0.660 |
| 3.5 | 3.9 | 2.1 | 0.55 |
| 4.0 | 3.9 | 2.1 | 0.55 |
| 4.5 | 3.9 | 2.1 | 0.55 |
| 5.0 | 3.9b | 2.1 | 0.56 |
| 5.5 | 4.0 | 2.2b | 0.56b |
| 6.0 | 4.2 | 2.3 | 0.59 |
| 6.5 | 4.8 | 2.6 | 0.68 |
| 7.0 | 6.8 | 3.7 | 0.96 |
| 7.5 | 13 | 7.1 | 1.9 |
| 8.0 | 33 | 18 | 4.7 |
| 8.2 | 50 | 27 | 7.1 |
Values represent the median values of the 10 highest sampling points.
a
The first row of values refers only to (H2S) and not ∑H2S.
b
Total sulfide calculation at the most environmentally relevant pH (Butterfield et al., 1994).