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TITLE Example 1.--Add uranium and speciate seawater.
SOLUTION 1 SEAWATER FROM NORDSTROM ET AL. (1979)
units ppm
pH 8.22
pe 8.451
density 1.023
temp 25.0
redox O(0)/O(-2)
Ca 412.3
Mg 1291.8
Na 10768.0
K 399.1
Fe 0.002
Mn 0.0002 pe
Si 4.28
Cl 19353.0
Alkalinity 141.682 as HCO3
S(6) 2712.0
N(5) 0.29 gfw 62.0
N(-3) 0.03 as NH4
U 3.3 ppb N(5)/N(-3)
O(0) 1.0 O2(g) -0.7
SOLUTION_MASTER_SPECIES
U U+4 0.0 238.0290 238.0290
U(4) U+4 0.0 238.0290
U(5) UO2+ 0.0 238.0290
U(6) UO2+2 0.0 238.0290
SOLUTION_SPECIES
#primary master species for U
#is also secondary master species for U(4)
U+4 = U+4
log_k 0.0
U+4 + 4 H2O = U(OH)4 + 4 H+
log_k -8.538
delta_h 24.760 kcal
U+4 + 5 H2O = U(OH)5- + 5 H+
log_k -13.147
delta_h 27.580 kcal
#secondary master species for U(5)
U+4 + 2 H2O = UO2+ + 4 H+ + e-
log_k -6.432
delta_h 31.130 kcal
#secondary master species for U(6)
U+4 + 2 H2O = UO2+2 + 4 H+ + 2 e-
log_k -9.217
delta_h 34.430 kcal
UO2+2 + H2O = UO2OH+ + H+
log_k -5.782
delta_h 11.015 kcal
2UO2+2 + 2H2O = (UO2)2(OH)2+2 + 2H+
log_k -5.626
delta_h -36.04 kcal
3UO2+2 + 5H2O = (UO2)3(OH)5+ + 5H+
log_k -15.641
delta_h -44.27 kcal
UO2+2 + CO3-2 = UO2CO3
log_k 10.064
delta_h 0.84 kcal
UO2+2 + 2CO3-2 = UO2(CO3)2-2
log_k 16.977
delta_h 3.48 kcal
UO2+2 + 3CO3-2 = UO2(CO3)3-4
log_k 21.397
delta_h -8.78 kcal
PHASES
Uraninite
UO2 + 4 H+ = U+4 + 2 H2O
log_k -3.490
delta_h -18.630 kcal
END