From: Dissolution and solubility of calcite-rhodochrosite solid solutions [(Ca1-xMnx)CO3] at 25 °C
Sample | Dissolution time (h) | pH | Concentration (mmol/L) | log_IAPc | Average log_IAP | ΔGf° (kJ/mol) | Average ΔGf° (kJ/mol) | ||
---|---|---|---|---|---|---|---|---|---|
Ca | Mn | HCO3 + CO3 | |||||||
(Ca1.00Mn0.00)CO3 | 2400 | 8.21 | 0.6677 | 0.0000 | 1.2831 | − 8.34 | − 8.44 | − 1129.04 | − 1129.63 |
4800 | 8.12 | 0.6330 | 0.0000 | 1.1790 | − 8.48 | ± 0.10 | − 1129.87 | ± 0.59 | |
7200 | 8.11 | 0.6323 | 0.0000 | 1.1507 | − 8.50 | − 1129.98 | |||
(Ca0.89Mn0.11)CO3a | 2400 | 8.14 | 0.7281 | 0.0031 | 1.4260 | − 8.62 | − 8.68 | − 1094.68 | − 1095.02 |
(Ca0.88Mn0.12)CO3b | 4800 | 8.13 | 0.6702 | 0.0023 | 1.2751 | − 8.72 | ± 0.06 | − 1095.24 | ± 0.34 |
7200 | 8.14 | 0.6749 | 0.0025 | 1.2841 | − 8.70 | − 1095.13 | |||
(Ca0.78Mn0.22)CO3a | 2400 | 8.04 | 0.9911 | 0.0046 | 1.9561 | − 8.74 | − 8.83 | − 1059.46 | − 1059.92 |
(Ca0.76Mn0.24)CO3b | 4800 | 8.07 | 0.8657 | 0.0026 | 1.7596 | − 8.85 | ± 0.08 | − 1060.06 | ± 0.46 |
7200 | 8.03 | 0.8708 | 0.0030 | 1.7536 | − 8.88 | − 1060.22 | |||
(Ca0.68Mn0.32)CO3a | 2400 | 7.99 | 1.0729 | 0.0052 | 2.0771 | − 8.99 | − 9.04 | − 1028.19 | − 1028.46 |
(Ca0.65Mn0.35)CO3b | 4800 | 8.01 | 1.0029 | 0.0039 | 1.9388 | − 9.06 | ± 0.05 | − 1028.55 | ± 0.27 |
7200 | 8.02 | 0.9766 | 0.0039 | 1.8492 | − 9.07 | − 1028.64 | |||
(Ca0.58Mn0.42)CO3a | 2400 | 8.01 | 1.0624 | 0.0057 | 2.0395 | − 9.21 | − 9.28 | − 996.79 | − 997.16 |
(Ca0.54Mn0.46)CO3b | 4800 | 8.02 | 0.9609 | 0.0043 | 1.8495 | − 9.32 | ± 0.07 | − 997.37 | ± 0.37 |
7200 | 7.98 | 1.0321 | 0.0049 | 1.9072 | − 9.31 | − 997.31 | |||
(Ca0.47Mn0.53)CO3a | 2400 | 7.96 | 1.0554 | 0.0091 | 2.0089 | − 9.39 | − 9.45 | − 962.13 | − 962.49 |
(Ca0.44Mn0.56)CO3b | 4800 | 7.97 | 1.1016 | 0.0058 | 2.0568 | − 9.47 | ± 0.07 | − 962.57 | ± 0.36 |
7200 | 7.94 | 1.0914 | 0.0058 | 2.0347 | − 9.51 | − 962.78 | |||
(Ca0.37Mn0.63)CO3a | 2400 | 8.00 | 1.4088 | 0.0100 | 2.0973 | − 9.48 | − 9.62 | − 930.11 | − 930.87 |
(Ca0.34Mn0.66)CO3b | 4800 | 8.01 | 1.1903 | 0.0062 | 1.6380 | − 9.73 | ± 0.13 | − 931.48 | ± 0.76 |
7200 | 7.96 | 1.1889 | 0.0073 | 2.0109 | − 9.64 | − 931.02 | |||
(Ca0.28Mn0.72)CO3a | 2400 | 7.93 | 1.0275 | 0.0095 | 1.9579 | − 9.79 | − 9.82 | − 902.68 | − 902.89 |
(Ca0.26Mn0.74)CO3b | 4800 | 7.98 | 1.0251 | 0.0074 | 1.9515 | − 9.82 | ± 0.05 | − 902.84 | ± 0.26 |
7200 | 7.92 | 1.0789 | 0.0074 | 1.9774 | − 9.87 | − 903.14 | |||
(Ca0.17Mn0.83)CO3a | 2400 | 7.90 | 0.9976 | 0.0102 | 1.8802 | − 10.01 | − 10.02 | − 868.28 | − 868.33 |
(Ca0.16Mn0.84)CO3b | 4800 | 7.93 | 1.0205 | 0.0092 | 1.9245 | − 10.01 | ± 0.02 | − 868.26 | ± 0.11 |
7200 | 7.86 | 1.0598 | 0.0101 | 1.9521 | − 10.04 | − 868.44 | |||
(Ca0.08Mn0.92)CO3a | 2400 | 7.65 | 0.6258 | 0.0256 | 1.3296 | − 10.21 | − 10.23 | − 840.16 | − 840.23 |
(Ca0.07Mn0.93)CO3b | 4800 | 7.66 | 0.7201 | 0.0199 | 1.5022 | − 10.26 | ± 0.03 | − 840.40 | ± 0.17 |
7200 | 7.75 | 0.7722 | 0.0169 | 1.5735 | − 10.21 | − 840.13 | |||
(Ca0.00Mn1.00)CO3 | 2400 | 7.29 | 0.0000 | 0.1871 | 0.5449 | − 10.16 | − 10.26 | − 813.92 | − 814.46 |
4800 | 7.31 | 0.0000 | 0.1419 | 0.5413 | − 10.26 | ± 0.10 | − 814.47 | ± 0.54 | |
7200 | 7.34 | 0.0000 | 0.1380 | 0.4123 | − 10.35 | − 815.00 |