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Nitrate contamination in irrigation groundwater, Isfahan, Iran

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Abstract

Groundwater is one of the major sources of water in Isfahan. Efficient management of these resources requires a good understanding of its status. This paper focuses on the hydrochemistry and also it wants to assess the nitrate concentration in irrigation groundwater of Isfahan suburb. All the groundwater samples are grouped into three categories, including Na-Cl + Ca-Cl (63 %), Na-SO4 + Ca-SO4 (23 %) and Ca-HCO3 (14 %). According to the EC and SAR, the most dominant classes are C3S1, C4S2 and C4S3. 55 % of samples indicate very high salinity and medium to very high alkalinity that is not suitable for irrigation. 84 % of the groundwater samples show nitrate contents higher than HAV (13 mg l−), while more than 25 % exceeded the maximum contamination level (44.27 mg l−) according to EPA regulations. The horizontal and vertical distribution patterns of nitrate in groundwater samples show a surficial origin for nitrate contamination. The high nitrate content can be attributed to the agricultural activities along with domestic sewage and industrial wastewaters in populated area. Based on results, using high nitrate groundwater for irrigation can minimize the requirement for inorganic fertilizers and reduce the cost of cultivation and nitrate contamination.

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Acknowledgments

The authors would like to thank Isfahan provincial directorate of environmental protection and Shiraz University Research Committee for making this study possible.

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Authors and Affiliations

  1. Department of Earth Sciences, College of Science, Shiraz University, 71454, Shiraz, Iran

    Ali Esmaeili, Farid Moore & Behnam Keshavarzi

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  1. Ali Esmaeili
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  2. Farid Moore
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  3. Behnam Keshavarzi
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Correspondence to Ali Esmaeili.

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Esmaeili, A., Moore, F. & Keshavarzi, B. Nitrate contamination in irrigation groundwater, Isfahan, Iran. Environ Earth Sci 72, 2511–2522 (2014). https://doi.org/10.1007/s12665-014-3159-z

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