Investigation of Recent Changes in Urmia Salt Lake

Lake Urmia is a salt lake in northwestern Iran near Turkey. In recent years, the water level has been decreased. To predict the mineralprecipitation in water, Single ion activity coefficients of major ions in Urmia Salt Lake have calculated using Pitzer approach. Usingthe results, saturation index for mineral calculated. Urmia Salt Lake brines have shown increase in saturation indices during the last 20 years.