Table 2 Basic chemistry of the natural waters used in precipitation experiments and the resulting experimental mineral precipitates.
Sample | Initial chemistry | Final chemistry (6 weeks) | |||||
|---|---|---|---|---|---|---|---|
pH | Cation (mg/L) | System | pH | Cation (mg/L) | Percent change | Precipitate mineralogy | |
Ground water | 8.12 | Mg – 340 | abiotic | 9.2 | Mg – 352 | +3.5% | no precipitate |
Ca – 4.00 | Ca – 4.48 | +12% | |||||
Si – 4.55 | Si – 5.36 | +18% | |||||
biotic | 9.6 | Mg – 134 | -61% | dypingite | |||
Ca – 2.45 | -39% | ||||||
Si – 1.73 | -62% | ||||||
Wetland water | 8.58 | Mg – 780 | abiotic | 9.0 | Mg – 457 | -41% | nesquehonite |
Ca – 11.1 | Ca – 6.25 | -44% | |||||
Si – 18.9 | Si – 19.9 | +5.3% | |||||
biotic | 9.5 | Mg – 177 | -77% | dypingite | |||
Ca – 1.99 | -82% | ||||||
Si – 0.16 | -99% | ||||||
w/ NaOH | abiotic | 10.3 | - | nesquehonite w/ dypingite | |||