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Hydrochemical characterization and geospatial analysis of groundwater quality in Cap Bon region, northeastern Tunisia

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Abstract

The hydrogeochemical characteristics of shallow groundwater in the Grombalia region, northeastern Tunisia, were investigated to evaluate suitability for irrigation and other uses and to determine the main processes that control its chemical composition. A total of 21 groundwater samples were collected from existing wells in January–February 2015 and were analyzed for the major cations and anions concentrations. Conductivity, pH, T°, O2 and salinity were also measured. Interrelationships between chemical parameters were determined by using the scatter matrix method. The suitability of groundwater for irrigation and other uses was assessed by determining the sodium adsorption ratio, soluble-sodium percentage, total dissolved solids, total hardness, Kelly’s index and permeability index values of water samples. The spatial distribution of key parameters was assessed using a GIS-based spatial gridding technique. This analysis indicated that the chemical composition of groundwater in the study area is of Cl–SO4–Na–Ca mixed facies with concentrations of many chemical constituents exceeding known guideline values for irrigation. The salinity of groundwater is controlled by most dominant cation and anion (Na–Cl). A correlation analysis shows that Na+ is the dominant cation and that reverse ion exchange is a dominant process that controls the hydrogeochemical evolution of groundwater in the area. Geospatial mapping of hydrochemical parameters and indices analyzed with the USSL and Wilcox diagrams show distinctive areas of irrigation suitability. In contrast, 76.2% of samples fall in the highly doubtful to unsuitable category and indicate that the central and north-eastern parts of the study area are unsuitable for irrigation due to a high salinity and alkalinity.

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Acknowledgements

The authors are grateful to Dr. Gunter Dörhöfer, Editor-in-Chief of the Journal of Environmental Earth Sciences, the associate editor who handled this manuscript and the anonymous reviewers for their constructive review and useful comments on the manuscript.

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  1. Faculty of Sciences of Tunis, Department of Geology, University of Tunis El Manar, El Manar II, 2092, Tunis, Tunisia

    Abdelaziz Sebei, Tarek Slama & Mohamed Amine Helali

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  1. Abdelaziz Sebei
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Sebei, A., Slama, T. & Helali, M.A. Hydrochemical characterization and geospatial analysis of groundwater quality in Cap Bon region, northeastern Tunisia. Environ Earth Sci 77, 557 (2018). https://doi.org/10.1007/s12665-018-7716-8

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