Hydrogeochemistry of Groundwater and Its Suitability for Drinking and Agricultural Use in Nahavand,Western Iran |
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Authors: | Mohsen Jalali |
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Institution: | (1) Department of Soil Science, College of Agriculture, Bu-Ali Sina University, Hamedan, Iran |
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Abstract: | Groundwater is the major source of drinking water in Nahavand city. However, the groundwater quality at the agricultural areas
has been deteriorating in recent years. Ground water quality monitoring is a tool which provides important information for
water management and sustainable development of the water resources in Nahavand. Hydrochemical investigations were carried
out in an agricultural area in Nahavand, western Iran, to assess chemical composition of groundwater. In this study, 64 representative
groundwater samples were collected from different irrigation wells and analyzed for pH, electrical conductivity, major ions,
and nitrate. The results of the chemical analysis of the groundwater showed that concentrations of ions vary widely and the
most prevalent water type is Ca–Mg–HCO3, followed by other water types: Ca–HCO3, Ca–Na–HCO3, and Na–Cl, which is in relation with their interactions with the geological formations of the basin, dissolution of feldspars
and chloride and bicarbonate minerals, and anthropogenic activities. Thirty-seven percent of the water samples showed nitrate
(NO3
−) concentrations above the human affected value (13 mg L−1). The phosphorous (P) concentration in groundwater was between 0.11 and 0.90 mg L−1, with an average value of 0.30 mg L−1, with all of the samples over 0.05 mg L−1. The most dominant class C2-S1 (76.5%) was found in the studied area, indicating that sodicity is very low and salinity is
medium, and that these waters are suitable for irrigation in almost all soils. Agronomic practices, such as cultivation, cropping,
and irrigation water management may decrease the average NO3
− concentration in water draining from the soil zone. |
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Keywords: | |
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