15 Conceptual Models and Computer Models
518
Phase
SI log IAP
log KT
Anhydrite
-0.84
-5.20
-4.36
CaSO 4
Aragonite
0.61
-7.72
-8.34
CaCO 3
Artinite
-2.03
7.57
9.60
MgCO 3 :Mg(OH) 2 :3H 2 O
Birnessite
4.81
5.37
0.56
MnO 2
Bixbyite
-2.68
47.73
50.41
Mn 2 O 3
Brucite
-2.28
14.56
16.84
Mg(OH) 2
Calcite
0.76
-7.72
-8.48
CaCO 3
Chalcedony
-0.51
-4.06
-3.55
SiO 2
Chrysotile
3.36
35.56
32.20
Mg 3 Si 2 O 5 (OH) 4
Clinoenstatite
-0.84
10.50
11.34
MgSiO 3
CO 2 (g)
-3.38
-21.53
-18.15
CO 2
Cristobalite
-0.48
-4.06
-3.59
SiO 2
Diopside
0.35
20.25
19.89
CaMgSi 2 O 6
Dolomite
2.40
-14.69
-17.09
CaMg(CO 3 ) 2
Epsomite
-2.36
-4.50
-2.14
MgSO 4 :7H 2 O
Fe(OH) 2.7 Cl 0.3
5.52
-6.02
-11.54
Fe(OH) 2.7 Cl 0.3
Fe(OH) 3 (a)
0.19
-3.42
-3.61
Fe(OH) 3
Fe 3 (OH) 8
-12.56
-9.34
3.22
Fe 3 (OH) 8
Forsterite
-3.24
25.07
28.31
Mg 2 SiO 4
Goethite
6.09
-3.41
-9.50
FeOOH
Greenalite
-36.43
-15.62
20.81
Fe 3 Si 2 O 5 (OH) 4
Gypsum
-0.64
-5.22
-4.58
CaSO 4 :2H 2 O
H 2 (g)
-41.22
1.82
43.04
H 2
Halite
-2.51
-0.92
1.58
NaCl
Hausmannite
1.78
19.77
17.99
Mn 3 O 4
Hematite
14.20
-6.81
-21.01
Fe 2 O 3
Huntite
1.36
-28.61
-29.97
CaMg 3 (CO 3 ) 4
Hydromagnesite
-4.56
-13.33
-8.76
Mg 5 (CO 3 ) 4 (OH) 2 :4H 2 O
Jarosite (ss)
-9.88
-43.38
-33.50
(K 0.77 Na 0.03 H 0.2 )Fe 3 (SO 4 ) 2 (OH) 6
Magadiite
-6.44
-20.74
-14.30
NaSi 7 O 13 (OH) 3 :3H 2 O
Maghemite
3.80
-6.81
-10.61
Fe 2 O 3
Magnesite
1.07
-6.96
-8.03
MgCO 3
Magnetite
3.96
-9.30
-13.26
Fe 3 O 4
Manganite
2.46
6.28
3.82
MnOOH
Melanterite
-19.35
-21.56
-2.21
FeSO 4 :7H 2 O
Mirabilite
-2.49
-3.60
-1.11
Na 2 SO 4 :10H 2 O
Mn 2 (SO 4 ) 3
-54.60
-9.29
45.31
Mn 2 (SO 4 ) 3
MnCl 2 :4H 2 O
-12.88
-10.17
2.71
MnCl 2 :4H 2 O
MnSO 4
-14.48
-11.81
2.67
MnSO 4
Nahcolite
-2.91
-13.79
-10.88
NaHCO 3
Table 15.3 According to the species distribution shown in Table 15.2, the PHREEQC model (Parkhurst 1995) was also
applied to calculate the saturation indices. Here, 'CO 2 (g)', 'H 2 (g)', 'NH 3 (g)', 'O 2 (g)' do not stand for mineral phases, but
for gaseous phases in which the saturation index is obtained as the logarithm of the respective partial pressure.
518
Phase
SI log IAP
log KT
Anhydrite
-0.84
-5.20
-4.36
CaSO 4
Aragonite
0.61
-7.72
-8.34
CaCO 3
Artinite
-2.03
7.57
9.60
MgCO 3 :Mg(OH) 2 :3H 2 O
Birnessite
4.81
5.37
0.56
MnO 2
Bixbyite
-2.68
47.73
50.41
Mn 2 O 3
Brucite
-2.28
14.56
16.84
Mg(OH) 2
Calcite
0.76
-7.72
-8.48
CaCO 3
Chalcedony
-0.51
-4.06
-3.55
SiO 2
Chrysotile
3.36
35.56
32.20
Mg 3 Si 2 O 5 (OH) 4
Clinoenstatite
-0.84
10.50
11.34
MgSiO 3
CO 2 (g)
-3.38
-21.53
-18.15
CO 2
Cristobalite
-0.48
-4.06
-3.59
SiO 2
Diopside
0.35
20.25
19.89
CaMgSi 2 O 6
Dolomite
2.40
-14.69
-17.09
CaMg(CO 3 ) 2
Epsomite
-2.36
-4.50
-2.14
MgSO 4 :7H 2 O
Fe(OH) 2.7 Cl 0.3
5.52
-6.02
-11.54
Fe(OH) 2.7 Cl 0.3
Fe(OH) 3 (a)
0.19
-3.42
-3.61
Fe(OH) 3
Fe 3 (OH) 8
-12.56
-9.34
3.22
Fe 3 (OH) 8
Forsterite
-3.24
25.07
28.31
Mg 2 SiO 4
Goethite
6.09
-3.41
-9.50
FeOOH
Greenalite
-36.43
-15.62
20.81
Fe 3 Si 2 O 5 (OH) 4
Gypsum
-0.64
-5.22
-4.58
CaSO 4 :2H 2 O
H 2 (g)
-41.22
1.82
43.04
H 2
Halite
-2.51
-0.92
1.58
NaCl
Hausmannite
1.78
19.77
17.99
Mn 3 O 4
Hematite
14.20
-6.81
-21.01
Fe 2 O 3
Huntite
1.36
-28.61
-29.97
CaMg 3 (CO 3 ) 4
Hydromagnesite
-4.56
-13.33
-8.76
Mg 5 (CO 3 ) 4 (OH) 2 :4H 2 O
Jarosite (ss)
-9.88
-43.38
-33.50
(K 0.77 Na 0.03 H 0.2 )Fe 3 (SO 4 ) 2 (OH) 6
Magadiite
-6.44
-20.74
-14.30
NaSi 7 O 13 (OH) 3 :3H 2 O
Maghemite
3.80
-6.81
-10.61
Fe 2 O 3
Magnesite
1.07
-6.96
-8.03
MgCO 3
Magnetite
3.96
-9.30
-13.26
Fe 3 O 4
Manganite
2.46
6.28
3.82
MnOOH
Melanterite
-19.35
-21.56
-2.21
FeSO 4 :7H 2 O
Mirabilite
-2.49
-3.60
-1.11
Na 2 SO 4 :10H 2 O
Mn 2 (SO 4 ) 3
-54.60
-9.29
45.31
Mn 2 (SO 4 ) 3
MnCl 2 :4H 2 O
-12.88
-10.17
2.71
MnCl 2 :4H 2 O
MnSO 4
-14.48
-11.81
2.67
MnSO 4
Nahcolite
-2.91
-13.79
-10.88
NaHCO 3
Table 15.3 According to the species distribution shown in Table 15.2, the PHREEQC model (Parkhurst 1995) was also
applied to calculate the saturation indices. Here, 'CO 2 (g)', 'H 2 (g)', 'NH 3 (g)', 'O 2 (g)' do not stand for mineral phases, but
for gaseous phases in which the saturation index is obtained as the logarithm of the respective partial pressure.