hydrogeochemical evaluation of groundwater and its suitability for various uses in the hastijan aquifer (central province –iran)

analytical results of 11 groundwater samples are used to evaluate the quality of groundwater in the hastijan area, (central province –iran). the main indices of water, ions physicochemical characteristics and the important heavy metals concentration studied. to estimate of water quality, piper, ghibbs, schoeller and wilcox diagrams, sodium absorption ratio, color-alkalinity and saturation index studied. based on the analytical results, groundwater quality in the hastijan area is generally varies from hard to very hard. the type and facies of water in study area is calcic bicarbonate and sodic and magnesic bicarbonate. in these waters, ca2+ and mg2+ concentrations is higher than na+ and k+, and hco3- is higher than so42- and cl-. consideration of rocks composition in part of the study area shows that evaporation formation (limestone, dolomite, brown sand stone, marl, shale and intercalated with gypsum and salt) caused increased na+, cl- concentrations and salinity of the groundwater. the results of calculated saturation index show that the saturation index for carbonate minerals is positive and for sulfate minerals is negative. according to the parameters and international standards, almost all of groundwater in the study area is suitable and usable for agricultural purposes and to be used for drinking as good, acceptable water. finally, the large portion of samples was corrosive for industrial usage.