Abstract
The chemical composition of 59 well water samples throughout the Alisadr area, Hamadan, western Iran was determined in order to describe the background ion concentration and to identify the major hydrogeochemical processes that control the observed groundwater chemistry. The hydrochemical types, Ca–HCO3, Ca–SO4, dominate the largest part of the groundwater followed by water types Ca–Cl and Mg–HCO3. Total hardness indicated that 30% of groundwater samples fell in the very hard water category. Ninety-seven percent of the water samples showed nitrate (\({\rm NO}_{3}^{-})\) concentrations above the human affected value (13 mg l − 1 \({\rm NO}_{3}^{-})\), while 15% exceeded the maximum acceptable level (50 mg l − 1 \({\rm NO}_{3}^{-})\) according to WHO regulations. With respect to sodium adsorption ratio, the groundwater can be used for irrigation on almost all soils with little danger of the developing harmful levels of exchangeable Na + . But with respect to electrical conductivity, the water quality for irrigation was low to medium, providing the necessary drainage to avoid the buildup of toxic salt concentrations. Geochemical modeling using PHREEQC enabled prediction of the saturation state of minerals and indicated the dissolution and precipitation reactions occurring in the groundwater. Groundwaters were undersaturated with respect to amorphous silica. Stability diagram indicated that the dominant cluster of groundwater samples fell into the K-feldspar field.
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Jalali, M. Groundwater geochemistry in the Alisadr, Hamadan, western Iran. Environ Monit Assess 166, 359–369 (2010). https://doi.org/10.1007/s10661-009-1007-5
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DOI: https://doi.org/10.1007/s10661-009-1007-5