Processes > Dissolution and precipitation

Evaporation

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samia22:
Bonsoir
Est-ce que pouvait-je avoir un codage qui me permet de calculer le taux d'évaporation de l'eau de mer?

dlparkhurst:
Example 17 in the Version 3 manual discusses inverse modeling. Also included is a calculation of evaporation of Black Sea water (17B). The following is the script for 17B, and it should provide a sufficient example for evaporation of seawater. You need to change the SOLUTION definition, and you might reconsider the appropriate phases.


--- Code: ---#must use DATABASE pitzer.dat
SOLUTION 1  Black Sea water
        units   mg/L
        density 1.014
        pH      8.0     # estimated
        Ca      233
        Mg      679
        Na      5820
        K       193
        S(6)    1460
        Cl      10340
        Br      35
        C       1       CO2(g) -3.5
EQUILIBRIUM_PHASES
 # carbonates...
 CO2(g) -3.5 10; Calcite 0 0
 # sulfates...
 Gypsum 0 0;     Anhydrite 0 0;  Glauberite 0 0;  Polyhalite 0 0
 Epsomite 0 0;   Kieserite 0 0;  Hexahydrite 0 0
 # chlorides...
 Halite 0 0;     Bischofite 0 0; Carnallite 0 0
USER_GRAPH Example 17B
 -head H2O Na K Mg Ca Cl SO4 Calcite Gypsum Anhydrite Halite\
       Glauberite Polyhalite
 -init false
 -axis_scale x_axis 0 100
 -axis_scale y_axis -5 1. 1
 -axis_scale sy_axis -5 10 5 100
 -axis_titles "Concentration factor" "Log(Molality)"  "Log(Moles of solid)"
 -chart_title "Evaporating Black Sea water"
 -start
 10 graph_x 1 / tot("water")
 20 graph_y log10(tot("Na")), log10(tot("K")), log10(tot("Mg")), log10(tot("Ca")),\
            log10(tot("Cl")), log10(tot("S"))
 30 if equi("Calcite") > 1e-5 then graph_sy log10(equi("Calcite")) else graph_sy -5
 35 if equi("Gypsum") > 1e-5 then graph_sy log10(equi("Gypsum")) else graph_sy -5
 40 if equi("Anhydrite") > 1e-5 then graph_sy log10(equi("Anhydrite")) else graph_sy -5
 50 if equi("Halite") > 1e-5 then graph_sy log10(equi("Halite")) else graph_sy -5
 60 if equi("Glauberite") > 1e-5 then graph_sy log10(equi("Glauberite")) else graph_sy -5
 70 if equi("Polyhalite") > 1e-5 then graph_sy log10(equi("Polyhalite")) else graph_sy -5
 80 if STEP_NO > 20 THEN PRINT "x", "Na", "K", "Mg", "Ca", "Cl", "S"
 90 if STEP_NO > 20 THEN PRINT 1 / tot("water"), (tot("Na")), (tot("K")), (tot("Mg")),\
                               (tot("Ca")), (tot("Cl")), (tot("S"))
 -end
REACTION
 H2O -1; 0 36 3*4 6*1 2*0.25 0.176 4*0.05 5*0.03
INCREMENTAL_REACTIONS true
END
--- End code ---

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