Table 1.
Experimental matrix, calculated CO2 fugacity, precipitation rate (R), curvature (a) of titrant volume vs. time plots (described in text), average mol % Sr and DPSr2+.
| Reactor Solution composition | Results | ||||||||
|---|---|---|---|---|---|---|---|---|---|
| Experiment ID* |
r (aCO32-/aCa2+) | Ω | CaCl2 (M) | NaHCO3 (M) | log CO2 (g) | R Ave (μmol/m2/min) ± StdErr | a(Curvature) | Sr (mol %) | DPSr2+** |
| IR-1(6) | 0.0032 | 9.0 | 0.009 | 0.001 | -3.85 | 60.6 ± 6.6 | 3.5E-04 | 0.14 | 0.086 ± 0.01(4) |
| IR-2(3) | 0.0315 | 9.3 | 0.003 | 0.003 | -3.34 | 41.3 ± 3.4 | 1.1E-04 | - | -- |
| IR-3(10) | 0.0728 | 9.2 | 0.002 | 0.0045 | -3.16 | 64.1 ± 3.9 | 8.2E-05 | 0.47 | 0.066 ± 0.01(4) |
| IR-4(8) | 0.1120 | 10.0 | 0.0017 | 0.0058 | -3.05 | 59.0 ± 1.1 | 3.1E-05 | 0.68 | 0.078 ± 0.01(4) |
| IR-5(4) | 0.1528 | 10.4 | 0.0015 | 0.0069 | -2.98 | 64.2 ± 1.3 | 3.1E-05 | 1.09 | 0.105 ± 0.01(4) |
| IR-6(10) | 0.3062 | 8.9 | 0.001 | 0.009 | -2.86 | 74.5 ± 4.8 | 9.8E-05 | 1.53 | 0.102 ± 0.02(4) |
| IR-7(7) | 0.5336 | 9.4 | 0.0008 | 0.0122 | -2.73 | 58.8 ± 2.7 | 1.5E-07 | 1.12 | 0.081 ± 0.01(4) |
| IR-8(8) | 0.7312 | 9.0 | 0.00068 | 0.014 | -2.67 | 50.8 ± 2.6 | -3.8E-05 | 1.03 | 0.081 ± 0.01(4) |
| IR-9(8) | 0.9624 | 8.9 | 0.0006 | 0.016 | -2.61 | 62.3 ± 4.4 | -3.1E-05 | 0.45 | 0.091 ± .001(3) |
| R-10(6) | 1.8220 | 9.7 | 0.00048 | 0.023 | -2.45 | 46.3 ± 9,6 | -7.9E-05 | 0.12 | 0.053 ± .001(2) |
| IR-11(5) | 4.1500 | 7.6 | 0.0003 | 0.031 | -2.33 | 0.0 | NA | - | -- |
Numbers in parentheses indicate *total number of replicates per experimental condition and **number of replicates used for strontium distribution coefficient calculations. The "--"sign is to indicate experiments where no Strontium was added. NA = Rate data not measured