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Table 3 Analytical data and solubility of the (Ca1-xMnx)CO3 solid solutions in N2-degassed 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

8.15

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

 
  1. aBulk composition before dissolution; bBulk composition after 300 d of dissolution
  2. cIAP estimated for the bulk composition after 300 d of dissolution