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| Saturation index, defined as the logarithm of measured activity ("concentration") product divided by the solubility product, illustrates the high hardness in irrigation water (East Highline Canal) supplied by diversion of the Colorado River and in discharge from the two major rivers. A calculated index that is much greater than zero (the value above which thermodynamic equilibrium predicts that precipitation can occur) indicates that deposition of calcium carbonate is very likely in the Salton Sea, whereas a value very close to zero suggests that formation of calcium sulfate may be taking place. |
Poster 3 of 16