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 | 8.15 | 0.6712 | 0.0000 | 1.2626 | − 8.40 | − 8.46 | − 1129.41 | − 1129.71 |
4800 | 8.14 | 0.6405 | 0.0000 | 1.1771 | − 8.46 | ± 0.06 | − 1129.73 | ± 0.30 | |
7200 | 8.12 | 0.6146 | 0.0000 | 1.1512 | − 8.51 | − 1129.99 | |||
(Ca0.89Mn0.11)CO3a | 2400 | 8.14 | 0.7306 | 0.0029 | 1.3955 | − 8.63 | − 8.70 | − 1094.74 | − 1095.12 |
(Ca0.88Mn0.12)CO3b | 4800 | 8.11 | 0.6762 | 0.0021 | 1.2796 | − 8.74 | ± 0.07 | − 1095.36 | ± 0.38 |
7200 | 8.13 | 0.6635 | 0.0019 | 1.2983 | − 8.72 | − 1095.27 | |||
(Ca0.78Mn0.22)CO3a | 2400 | 8.07 | 0.9646 | 0.0041 | 1.9198 | − 8.74 | − 8.83 | − 1059.45 | − 1059.96 |
(Ca0.76Mn0.24)CO3b | 4800 | 8.05 | 0.8793 | 0.0028 | 1.7496 | − 8.86 | ± 0.09 | − 1060.14 | ± 0.51 |
7200 | 8.02 | 0.8767 | 0.0027 | 1.7703 | − 8.89 | − 1060.30 | |||
(Ca0.68Mn0.32)CO3a | 2400 | 7.99 | 1.0529 | 0.0053 | 2.0362 | − 8.98 | − 9.03 | − 1028.24 | − 1028.56 |
(Ca0.66Mn0.34)CO3b | 4800 | 8.00 | 0.9690 | 0.0041 | 1.9116 | − 9.05 | ± 0.06 | − 1028.66 | ± 0.32 |
7200 | 8.00 | 0.9715 | 0.0037 | 1.8750 | − 9.07 | − 1028.78 | |||
(Ca0.58Mn0.42)CO3a | 2400 | 8.00 | 1.0290 | 0.0060 | 1.9608 | − 9.21 | − 9.26 | − 996.92 | − 997.17 |
(Ca0.55Mn0.45)CO3b | 4800 | 7.97 | 1.0181 | 0.0053 | 1.9182 | − 9.28 | ± 0.05 | − 997.29 | ± 0.25 |
7200 | 7.98 | 1.0265 | 0.0048 | 1.9362 | − 9.28 | − 997.30 | |||
(Ca0.47Mn0.53)CO3a | 2400 | 7.93 | 1.1697 | 0.0080 | 2.2236 | − 9.37 | − 9.44 | − 962.15 | − 962.54 |
(Ca0.45Mn0.55)CO3b | 4800 | 7.92 | 1.1162 | 0.0066 | 2.0954 | − 9.46 | ± 0.07 | − 962.62 | ± 0.38 |
7200 | 7.96 | 1.0650 | 0.0054 | 1.9879 | − 9.49 | − 962.83 | |||
(Ca0.37Mn0.63)CO3a | 2400 | 7.96 | 1.4048 | 0.0107 | 2.0743 | − 9.49 | − 9.61 | − 930.26 | − 930.93 |
(Ca0.35Mn0.65)CO3b | 4800 | 7.89 | 1.2750 | 0.0078 | 2.0165 | − 9.67 | ± 0.12 | − 931.27 | ± 0.67 |
7200 | 7.92 | 1.1846 | 0.0073 | 2.0147 | − 9.66 | − 931.26 | |||
(Ca0.28Mn0.72)CO3a | 2400 | 7.92 | 1.0190 | 0.0104 | 1.9639 | − 9.75 | − 9.82 | − 902.58 | − 902.97 |
(Ca0.27Mn0.73)CO3b | 4800 | 7.90 | 1.0256 | 0.0081 | 1.9219 | − 9.85 | ± 0.07 | − 903.18 | ± 0.39 |
7200 | 7.90 | 1.0883 | 0.0077 | 2.0129 | − 9.85 | − 903.15 | |||
(Ca0.17Mn0.83)CO3a | 2400 | 8.00 | 0.9781 | 0.0124 | 1.8736 | − 9.84 | − 9.98 | − 867.32 | − 868.09 |
(Ca0.16Mn0.84)CO3b | 4800 | 7.91 | 0.9155 | 0.0102 | 1.7284 | − 10.04 | ± 0.13 | − 868.42 | ± 0.76 |
7200 | 7.88 | 1.0614 | 0.0092 | 1.9629 | − 10.05 | − 868.51 | |||
(Ca0.08Mn0.92)CO3a | 2400 | 7.85 | 0.6178 | 0.0246 | 1.3181 | − 10.01 | − 10.11 | − 839.09 | − 839.66 |
(Ca0.08Mn0.92)CO3b | 4800 | 7.88 | 0.6963 | 0.0145 | 1.4213 | − 10.16 | ± 0.10 | − 839.95 | ± 0.56 |
7200 | 7.86 | 0.7745 | 0.0140 | 1.5604 | − 10.16 | − 839.93 | |||
(Ca0.00Mn1.00)CO3 | 2400 | 7.31 | 0.0000 | 0.1700 | 0.5620 | − 10.17 | − 10.25 | − 813.95 | − 814.39 |
4800 | 7.34 | 0.0000 | 0.1576 | 0.4657 | − 10.25 | ± 0.08 | − 814.39 | ± 0.44 | |
7200 | 7.29 | 0.0000 | 0.1489 | 0.4647 | − 10.33 | − 814.84 |