Abstract
Salinity and sodicity of groundwater are the principal water quality concerns in irrigated areas of arid and semi-arid regions. The hydrochemical characteristics and sodicity of groundwater in the Shirin Sou area, western Iran were investigated in this study by chemical analyses of groundwater samples from 49 wells. Chemical analysis of the groundwater showed that the mean concentration of the cations was in the order: Na+ > Ca2+ > Mg2+ > K+, while that for anions was SO3 2− > Cl− > HCO3 − > NO3 −. The most prevalent water type is Na–SO4 followed by water types Na–Cl and Ca–SO4. The chemical evolution of groundwater is primarily controlled by water–rock interactions: mainly weathering of aluminosilicates, dissolution of sulfate minerals, and cation exchange reactions. Sulfate dissolution and pyrite weathering may both contribute to the SO4 2− load of the groundwater. High Na+ concentrations in groundwater participate in ion-exchange processes, resulting in the displacement of base cations into solution and raised concentrations in groundwater. The principal component analysis (PCA) performed on groundwater identified three principal components controlling variability of groundwater chemistry. Electrical conductivity, Ca2+, Mg2+, Na+, SO4 2−, and Cl− content were associated in the same component (PC1) (salinity), most likely linked to anthropogenic activities.
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The author is especially grateful to two anonymous reviewers for critical review, perceptive comments, and editing on the manuscript.
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Jalali, M. Hydrochemical Characteristics and Sodification of Groundwater in the Shirin Sou, Hamedan, Western Iran. Nat Resour Res 21, 61–73 (2012). https://doi.org/10.1007/s11053-011-9152-2
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DOI: https://doi.org/10.1007/s11053-011-9152-2