Hydrochemical Characterization of Groundwater Quality for Drinking and Agricultural Purposes: A Case Study in Rafsanjan Plain, Iran

Abstract

One of the important purposes of hydrology is to ensure water supply in accordance with the quality criteria for agricultural, industrial, and drinking water uses. The groundwater is the main source of water supply in arid and semi-arid regions. This study was conducted to evaluate factors regulating groundwater quality in Rafsanjan plain. A total of 1040 groundwater samples randomly were collected from different areas of Rafsanjan. Then, each sample was analyzed for the major ions based on standard methods. The pH, SAR, EC, and TDS parameters and concentrations of Ca2+, Mg2+, and Na+ cations, and Cl−, , and anions were measured. Also boron concentration in each sample was determined. Although, maximum and minimum values of EC and TDS linked to the Anar-Beyaz area and Eastern Urban, respectively, irrigation water EC condition, however, was critical in the study areas. The pH value in Western Urban was higher than the other areas, and its value for Anar-Beyaz area was lower than the other areas, but pH value is at the optimal level in all the study areas. The results showed that hazard state with respect to Mg was critical except in Koshkoueiyeh and Anar-Beyaz areas, that these areas are marginal for irrigation use with little harm with reference to Mg. From the results, it was concluded that the status of boron concentration in study areas was critical. According to the hydrochemistry diagrams, the main groundwater type in different study areas was NaCl. Groundwater quality was not appropriate for drinking usage, and its status for agricultural practices was unsuitable in these areas.

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