Table 1.
Ionic composition of Yellowstone hot spring water used in the present study. Concentrations are shown as millimolar (mM) units.
| ‘Bison Pool’ Outflow, Lower Geyser Basin | |
| Temperature | 68.4 °C |
| pH | 7.9 |
| Na | 12.52 mM |
| Ca | 0.01 mM |
| Mg | 0.08 µM |
| K | 0.36 mM |
| DIC (HCO3−) | 5.42 mM |
| Cl | 6.12 mM |
| F | 1.21 mM |
| SO4 | 0.17 mM |
| SiO2 (dissolved) | 3.60 mM |
| Cationic equivalents | 12.90 mM |
| Anionic equivalents | 13.09 mM |
| DOC (dissolved organic carbon) 49.4 micromoles per liter | |
| Midway Geyser Basin | |
| Temperature 53.0 °C | |
| pH | 3.3 |
| Na | 0.39 mM |
| Ca | 0.02 mM |
| Mg | 0.01 mM |
| K | 0.17 mM |
| DIC (H2CO3) | 0.17 mM |
| Cl | 0.14 mM |
| F | 0.03 mM |
| SO4 | 0.32 mM |
| SiO2 (dissolved) | (not measured) |
| Cationic equivalents | 1.12 mM |
| Anionic equivalents | 0.67 mM |
| DOC (dissolved organic carbon) 43.8 micromoles per liter | |