Abstract
This study presents the groundwater quality assessment in the north of Isfahan, Iran. In the study area, assessment and measurement of groundwater hydrochemical parameters such as pH, total dissolved solids (TDS), electrical conductivity (EC), sodium absorption ratio (SAR), total hardness, major cations (K+, Na+, Ca2+ and Mg2+) and major anions (Cl−, \({\text{HCO}}_{ 3}^{ - } ,{\text{CO}}_{3}^{2 - }\) and \({\text{SO}}_{4}^{2 - }\)) concentrations were performed. Accordingly, the 66 water samples from different locations were collected during April and May 2015. Water samples collected in the field were analyzed in the laboratory for cations and anions using the standard methods. In this research, the analytical results of physiochemical parameters of groundwater were compared with the standard guideline values as recommended by the world health organization (WHO) for drinking and public health purposes. The pH values of groundwater samples varied from 7.05 to 8.95 with a mean of 7.78, indicating a neutral to slightly alkaline water. TDS values showed that 14% of the samples exceeds the desirable limit given by WHO. EC values varied from 213 to 4320 µS/cm, while 23% of the samples were more than the standard limit. Gibbs diagram had shown that 90% of the samples in the study area fall in the rock weathering zone, and this means that chemical weathering of rock-forming minerals is the main factor controlling the water chemistry in the study area. Irrigation suitability and risk assessment of groundwater are evaluated by measuring EC, %Na, SAR and RSC. According to the dominant cations and anions, five types of water were identified in the water samples: Ca-HCO3, Ca-SO4, Na-Cl, Na-HCO3 and Na-SO4. The results show that the majority of samples (30 samples, 45%) belongs to the mixed Na-SO4 water type. Correlation analysis and principal component analysis was used to identify the relationship between ions and physicochemical parameters. Results indicated that 18 stations of the study area had the best quality and can be used for irrigation and drinking purposes in the future.
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Acknowledgements
The authors would like to thank the Amirkabir University of Technology (Polytechnic Tehran) for supporting this research. The contribution of Adonis Fard Mousavi, Omid Mazaheri and Mohammad Parsa is appreciated. Funding was provided by Amirkabir University of Technology (Grant No. 95930).
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Rezaei, A., Hassani, H. Hydrogeochemistry study and groundwater quality assessment in the north of Isfahan, Iran. Environ Geochem Health 40, 583–608 (2018). https://doi.org/10.1007/s10653-017-0003-x
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DOI: https://doi.org/10.1007/s10653-017-0003-x