ex16
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TITLE Example 16.--Inverse modeling of Sierra springs
SOLUTION_SPREAD
-units mmol/L
Number pH Si Ca Mg Na K Alkalinity S(6) Cl
1 6.2 0.273 0.078 0.029 0.134 0.028 0.328 0.01 0.014
2 6.8 0.41 0.26 0.071 0.259 0.04 0.895 0.025 0.03
INVERSE_MODELING 1
-solutions 1 2
-uncertainty 0.025
-range
-phases
Halite
Gypsum
Kaolinite precip
Ca-montmorillonite precip
CO2(g)
Calcite
Chalcedony precip
Biotite dissolve
Plagioclase dissolve
-balances
Ca 0.05 0.025
PHASES
Biotite
KMg3AlSi3O10(OH)2 + 6H+ + 4H2O = K+ + 3Mg+2 + Al(OH)4- + 3H4SiO4
log_k 0.0 # No log_k, Inverse modeling only
Plagioclase
Na0.62Ca0.38Al1.38Si2.62O8 + 5.52 H+ + 2.48H2O = \
0.62Na+ + 0.38Ca+2 + 1.38Al+3 + 2.62H4SiO4
log_k 0.0 # No log_k, inverse modeling only
END
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