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Nitrate pollution of groundwater in Toyserkan, western Iran

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Abstract

A total of 95 groundwater samples were collected from Toyserkan, western Iran to assess the chemical composition and nitrate (NO3 ) status of groundwater. The most prevalent water type is Ca–HCO3 followed by water types Ca–Mg–HCO3. In comparison with the World Health Organization (WHO) drinking water guideline of 50 mg l−1 for NO3 , a total of nine wells (9.5%) showed higher concentrations. In 36% of samples (34) NO3 concentration was low (<20 mg l−1), and in 53.7% of samples (51), in the range of 20–50 mg l−1. The samples were classified into four groups based on NO3 and chloride (Cl) concentrations. Of the samples, 40% were classified as group 4 and were relatively high in Cl and NO3 (Cl > 47 mg l−1, NO3  > 27 mg l−1). The high correlation between NO3 and Cl (r = 0.86, p < 0.01) is consistent with a manure source, resulting from the practice of adding salt to animal feed. Pollution of groundwaters appeared to be affected by the application of inorganic fertilizer at greater than agronomic rates, Cl-salt inputs, and irrigation practice.

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Jalali, M. Nitrate pollution of groundwater in Toyserkan, western Iran. Environ Earth Sci 62, 907–913 (2011). https://doi.org/10.1007/s12665-010-0576-5

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