Table 2.
Ionic composition of Yellowstone hot spring water [16]. Concentrations are shown both as ppm and as millimolar (mM).
| Mammoth Hot Springs T = | 71.5 ± 2 °C | (N = 7) | Mean |
| pH | 6.5 ± 0.3 | (N = 6) | 6.5 |
| Na | 131 ± 7 ppm | (N = 8) | 5.7 mM |
| Cl | 166 ± 3 ppm | (N = 9) | 4.6 mM |
| Ca | 305 ± 60 ppm | (N = 6) | 7.6 mM |
| Mg | 68 ± 5.7 ppm | (N = 7) | 2.8 mM |
| K | 55 ± 8 ppm | (N = 7) | 1.4 mM |
| HCO3 | 725 ± 135 ppm | (N = 5) | 12 mM |
| SO4 | 510 ± 38 ppm | (N = 7) | 5.2 mM |
| SiO2 | 53 ± 3.8 ppm | (N = 8) | 0.9 mM |
| Cationic equivalents | 27.9 mM | ||
| Anionic equivalents | 28.2 mM | ||
| Norris Geyser Basin T = | 86 ± 6 Degrees °C | (N = 20) | Mean |
| pH | 4.1 ± 0.7 | (N = 14) | 4.1 |
| Na | 299 ± 130 ppm | (N = 18) | 13 mM |
| Cl | 611 ± 171 ppm | (N = 10) | 17 mM |
| Ca | 5.9 ± 3.8 ppm | (N = 16) | 0.150 mM |
| Mg | 0.6 ± 0.3 ppm | (N = 16) | 0.026 mM |
| K | 53 ± 26 ppm | (N = 38) | 1.4 mM |
| H2CO3 | ~0 | ||
| SO4 | 131 ± 68 ppm | (N = 4) | 1.3 mM |
| SiO2 | 450 ± 123 ppm | (N = 9) | 7.5 mM |
| Cationic equivalents | 14.7 mM | ||
| Anionic equivalents | 18.3 mM |