Skip to main content

Table 4 Analytical data and solubility of the (Ca1-xMnx)CO3 solid solutions in CO2-saturated water at 25 °C

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 8.00 0.7096 0.0000 1.3379 − 8.51 − 8.59 − 1130.00 − 1130.48
  4800 7.92 0.6304 0.0000 1.1650 − 8.69  ± 0.10 − 1131.05  ± 0.57
  7200 8.04 0.6315 0.0000 1.1547 − 8.57   − 1130.38  
(Ca0.89Mn0.11)CO3a 2400 8.13 0.7705 0.0030 1.4653 − 8.60 − 8.66 − 1094.57 − 1094.93
(Ca0.88Mn0.12)CO3b 4800 8.14 0.6686 0.0032 1.2606 − 8.69  ± 0.06 − 1095.12  ± 0.36
  7200 8.16 0.6512 0.0033 1.2451 − 8.69   − 1095.09  
(Ca0.78Mn0.22)CO3a 2400 8.11 0.7954 0.0039 1.5584 − 8.85 − 8.92 − 1060.05 − 1060.50
(Ca0.76Mn0.24)CO3b 4800 8.11 0.6830 0.0039 1.3393 − 8.95  ± 0.08 − 1060.66  ± 0.45
  7200 8.12 0.6593 0.0038 1.2771 − 8.97   − 1060.79  
(Ca0.68Mn0.32)CO3a 2400 8.06 0.8304 0.0054 1.5895 − 9.08 − 9.05 − 1028.73 − 1028.53
(Ca0.65Mn0.35)CO3b 4800 8.09 0.8764 0.0046 1.6778 − 9.04  ± 0.03 − 1028.49  ± 0.20
  7200 8.05 0.9419 0.0048 1.8336 − 9.02   − 1028.38  
(Ca0.58Mn0.42)CO3a 2400 8.06 0.9222 0.0057 1.7134 − 9.24 − 9.23 − 997.07 − 997.03
(Ca0.55Mn0.45)CO3b 4800 8.06 0.9464 0.0054 1.7810 − 9.23  ± 0.01 − 997.00  ± 0.04
  7200 8.01 1.0500 0.0052 1.9438 − 9.23   − 997.02  
(Ca0.47Mn0.53)CO3a 2400 8.01 0.8893 0.0058 1.6451 − 9.55 − 9.47 − 963.04 − 962.60
(Ca0.44Mn0.56)CO3b 4800 8.01 1.0871 0.0069 2.0502 − 9.39  ± 0.08 − 962.13  ± 0.46
  7200 7.99 1.0713 0.0058 1.9531 − 9.48   − 962.61  
(Ca0.37Mn0.63)CO3a 2400 7.98 1.2446 0.0101 1.6866 − 9.58 − 9.61 − 930.78 − 930.96
(Ca0.35Mn0.65)CO3b 4800 7.95 1.3037 0.0085 1.8842 − 9.61  ± 0.03 − 930.94  ± 0.19
  7200 7.99 1.1368 0.0070 1.8409 − 9.64   − 931.14  
(Ca0.28Mn0.72)CO3a 2400 8.00 0.9182 0.0105 1.7070 − 9.77 − 9.82 − 902.46 − 902.74
(Ca0.25Mn0.75)CO3b 4800 8.02 0.8777 0.0084 1.6451 − 9.84  ± 0.05 − 902.85  ± 0.28
  7200 8.02 0.9792 0.0073 1.7481 − 9.85   − 902.92  
(Ca0.17Mn0.83)CO3a 2400 7.81 0.9402 0.0105 1.7566 − 10.12 − 10.05 − 868.91 − 868.51
(Ca0.16Mn0.84)CO3b 4800 7.97 0.8331 0.0108 1.5837 − 10.00  ± 0.07 − 868.19  ± 0.40
  7200 8.01 0.8028 0.0091 1.4962 − 10.04   − 868.44  
(Ca0.08Mn0.92)CO3a 2400 7.70 0.5699 0.0264 1.2909 − 10.16 − 10.24 − 839.86 − 840.32
(Ca0.07Mn0.93)CO3b 4800 7.71 0.6976 0.0196 1.4666 − 10.22  ± 0.11 − 840.18  ± 0.60
  7200 7.71 0.6368 0.0174 1.1982 − 10.35   − 840.93  
(Ca0.00Mn1.00)CO3 2400 7.25 0.0000 0.1717 0.5410 − 10.25 − 10.28 − 814.39 − 814.59
  4800 7.24 0.0000 0.1687 0.4840 − 10.31  ± 0.03 − 814.76  ± 0.20
  7200 7.29 0.0000 0.1633 0.4620 − 10.29   − 814.64  
  1. aBulk composition before dissolution; bBulk composition after 300 d of dissolution;
  2. cIAP estimated for the bulk composition after 300 d of dissolution