ارزيابي هيدروژئوشيميايي آب هاي زيرزميني منطقه سلماس و تعيين كيفيت آنها براي مصارف مختلف

Hydrogeochemical Evaluation of Groundwater and Its Suitability for Various Uses in the Salmas Aquifer, Northwest of Iran

Analytical results of 29 groundwater samples are used to evaluate the quality of groundwater in the Salmas area, Northwest of Iran. Based on the analytical results, groundwater quality in the Salmas area is generally fresh and varies from hard to very hard. The dominant hydrochemical facies of groundwater in 2+ 2+ 2-study area is Mg, Ca -HC03. Alkali earths(Ca , Mg ) and weak acids(CO 3, HC03) are slightly + + 2-dominating over alkalis(Na , K ) and strong acids(SO 4, CI). Consideration of rocks composition in the north part of the study area shows that evaporation formation(limestone, marl, shale and intercalated with + gypsum and salt) caused increased Na , CI concentrations and salinity of the groundwater. The results of calculation saturation index show that the saturation index for carbonate minerals is positive and for sulfate minerals, C02 and H2 gases is negative. According to the parameters and international standards, except groundwater of north part of the study area almost all of groundwater in the study area is suitable for drinking and agricultural purposes.