Table 3. FREZCHEM2 model output for evaporation of seawater at 0C.
0.00C (273.15 K)
Temperature
Water amount
50.00 g
SOLID PHASES
N
Phase
Moles
G/RT
1
NaCl(cr)
0.28103
3.4448
2
Na2SO4*10H2O(cr)
0.02021
5.7260
AQUEOUS SOLUTION
Ionic strength
8.0709
Osmotic coefficient
1.5573
N
Species
Moles
Molality
Activity
Act. coef.
G/RT
Na+(aq)
1
0.16551D+00
0.35701D+01
0.28612D+01
0.8014
0.0000
K+(aq)
2
0.10630D01
0.22929D+00
0.74428D01
0.3246
0.0000
Ca+2
0.82305D02
0.17754D+00
0.16740D+00
0.9429
0.0000
3
Mg+2
4
0.55155D01
0.11897D+01
0.27250D+01
2.2905
0.0000
Cl(aq)
5
0.28715D+00
0.61941D+01
0.10952D+02
1.7681
0.0000
SO42(aq)
0.78786D02
0.16995D+00
0.10190D01
0.0600
0.0000
6
7
CaSO4(aq)
0.12993D 02
0.28027D01
0.28027D01
1.0000
2.7979
8
MgSO4(aq)
0.53787D05
0.11602D03
0.11602D03
1.0000
5.4788
9
H2O(l)
0.25733D+01
0.72306D+00
0.0000
BALANCE
Total
Solids
Solution
Total computed
H2O
0.277542E+01
0.202067E+00
0.257334E+01
0.277541E+01
Na+
0.486950E+00
0.321441E+00
0.165509E+00
0.486950E+00
K+
0.106300E01
0.000000E+00
0.106300E01
0.106300E01
Ca+2
0.953000E02
0.000000E+00
0.952987E02
0.952987E02
Mg+2
0.551600E01
0.000000E+00
0.551600E01
0.551600E01
Cl
0.568180E+00
0.281028E+00
0.287154E+00
0.568182E+00
SO42
0.293900E01
0.202067E01
0.918331E02
0.293900E01
Number of iterations
45
Table 4. Temperatures (C) of first appearance
of solid phases on chilling of seawater.
FREZCHEM2
Modela
Solid
Experiment
model
1.921b
Ice
1.924
1.921
8.2c
Mirabilite
5.90
5.87
22.9 c
Hydrohalite
22.84
22.87
36 c
Sylvite
34.25
34.30
MgCl2 . 12H2O
36 c
36.82
36.82
54 c
53.64d
Antarcticite
53.73
a. Spencer et al. (1990).
b. Fujino et al. (1974).
c. Nelson and Thompson (1954).
d. Calculated in sulfate-free system.
8
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