Environmental Engineering Reference
In-Depth Information
Table 9.8.1
Dissolution rate law parameters of selected minerals
Mineral
Neutral mechanism
Proton-promoted mechanism
Chemical composition
log
k
n
E
n
log
k
H
E
H
n
H
(mol m
−
2
s
−
1
)
(kJ mol
−
1
)
(mol m
−
2
s
−
1
)
(kJ mol
−
1
)
M
(II)
-rich silicates
Oligoclase (a type of
plagioclase feldspar)
(Na,Ca)(Al,Si)
4
O
8
where
Ca/(Ca
+
Na)
=
10 to 30%
-11.84
69.8
-9.67
65.0
0.457
Ca
0.52
(Al
2.8
Fe
0.5
Mg
0.7
)
(Si
7.65
Al
0.35
)O
20
(OH)
4
Smectite (a M-rich clay)
-12.78
35.0
-10.98
23.6
0.340
M
(II)
-poor silicates
Quartz
-13.99
87.6
SiO
2
Albite (Na-feldspar)
-12.56
69.8
-10.16
65.0
0.457
NaAlSi
3
O
8
Kaolinite (a M-poor clay)
-13.18
22.2
-11.31
65.9
0.777
Al
2
Si
2
O
5
(OH)
4
Carbonate minerals
Calcite -5.81 23.5 -0.30 14.4 1.000 CaCO
3
Magnesite
-9.34 23.5 -6.38 14.4 1.000 MgCO
3
Dissolution rate law parameters of selected carbon sequestration-relevant minerals as compiled by Palandri and Kharaka [9.36]. Rate law
parameters for the hydroxyl-promoted dissolution mechanism are not included in the table.
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