The brines are highly concentrated solutions of mineral salts with a salinity that far exceeds that of seawater (120 to 440g / l). In chotts of Lower Algerian Sahara, they have mainly a very marked sodic-chlorinated character. Databases of the thermodynamic model PHREEQC v3 were used to determine the saturated state of these brines with respect to principal chemical species. They are more oversaturated with calcite than with gypsum. The saturated state compared to the halite is no longer achieved. Indeed, we use the thermodynamic model PHREEQC v3 to calculate the mineral/solutions equilibria on the basis of different assumptions. The test of these assumptions shows that each one has its limits to simulate and control the thermodynamic behavior of the brines.

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