Activity Coefficients of Major Ions and Salts in Urmia Salt Lake

All of researches have been done about Urmia Salt Lake up to now, are about its chemical composition. Whereas thermodynamics study of the lake and evaluation of single-ion and mean salt activity in order to prepare phase diagram has theoretical and practical importance. In this study, ionic and salt activity coefficients have computed in 25°C temperature, assuming homogenous chemical composition in the lake and using published information in recent years. By Pitzer model and its results, we have predicted solubility and saturation indexes for some minerals.Urmia Salt Lake brines were shown to be oversaturated with respect to magnezit and dolomite.