all
calculations with PHREEQC
(Parkhurst & Appelo), version 2.12.5 (Nov 2005) PITZER dataset.
carbonate
equilibria are calculated for a system open to ambient CO2
(pCO2 = 0.0003 ; log pCO2 = -3.52)
the column
"@ seawater evaporation" gives the percentage of seawater
you have to evaporate until this mineral starts precipitating
the column
"sewater content" gives an approximate amount, that may
be precipitated from 1 L of seawater
| |
|
solubility
constant |
molar
weight |
solubility
@ 25°C
|
solubility
@ 25°C |
equilibrium
pH |
@ seawater
evaporation |
seawater
content |
| NAME |
composition |
log(KT) |
g/mol |
mol/L |
g/L |
-log
[H+] |
%
|
g/L |
| kieserite |
MgSO4·H2O |
-0.12 |
138.39 |
6.251 |
865.0 |
4.83 |
99.0 |
2.2 |
| halite |
NaCl |
1.57 |
58.443 |
6.100 |
356.5 |
6.38 |
90.6 |
28 |
| sylvite |
KCl |
0.9 |
74.555 |
4.797 |
357.6 |
6.87 |
99.4 |
0.75 |
| glauberite |
Na2Ca(SO4)2 |
-5.25 |
278.19 |
0.426 |
118.7 |
7.16 |
92.4 |
1.4 |
| anhydrite |
CaSO4 |
-4.36 |
136.14 |
2.28·10-2 |
3.104 |
7.07 |
|
|
| gypsum |
CaSO4·2H2O |
-4.58 |
172.18 |
1.52·10-2 |
2.617 |
7.06 |
71.0 |
1.6 |
| celestite |
SrSO4 |
-6.64 |
183.68 |
6.25·10-4 |
0.115 |
7.01 |
70.3 |
0.02 |
| magnesite |
MgCO3 |
-8.41 |
84.323 |
8.41·10-4 |
0.071 |
8.50 |
|
|
| calcite |
CaCO3 |
-8.41 |
100.09 |
5.21·10-4 |
0.052 |
8.31 |
|
|
| dolomite |
CaMg(CO3)2 |
-17.08 |
184.41 |
2.99·10-4 |
0.055 |
8.36 |
|
0.07 |
|
