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Hydrochemistry and groundwater quality in a semiarid calcareous area: an evaluation of major ion chemistry using a stoichiometric approach

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Abstract

This study is a wide-ranging evaluation of groundwater within the calcareous semiarid area, Gaziantep in southeast Anatolia, Turkey. The resulting water chemistry data (1) explains the interactions between rock and water, (2) evaluates the quantitative relationships between chemical species (major ions), (3) separates hydrochemical facies, (4) provides information on current water quality for multiple uses, and (5) acts as a benchmark for future research. Relationships between ion concentrations (as meq/L) were analyzed through linear modeling and calculation of coefficients of determination (R2). Stoichiometric calculations were employed to determine the quantitative relationships between ions in groundwater. Calculations between (Ca2++Mg2+) and HCO3 indicated that, even at different concentrations of the total alkaline earth metal ion (M2+), the relative percent remained at 72% for all samples. The majority of Ca2+, Mg2+, and HCO3 ions in groundwater were derived from weathering of calcite, the most common mineral in the local geology. Weathering of dolomite was also important to the contribution of ions in some areas. Ca-HCO3 was found to be the dominant water type for 81% of raw samples; a mixed water type was found in 17% of the samples. The major dissolved components of groundwater are, therefore, Ca(HCO3)2 and, to a lesser degree, Mg(HCO3)2.

The sampled groundwater was generally found to meet drinking water quality guidelines for most of the physicochemical quality properties for which standards are available, and with regard to concentrations of Mg2+, Na+, K+, Cl, SO42−, NO2, and NH4+. However, NO3, Ca2+, and HCO3 concentrations in several groundwater samples were in excess of maximum acceptable concentrations (MACs).

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Acknowledgments

Our thanks to the Laboratory of Water and Sewage Department, Metropolitan Municipality of Gaziantep (GASKI) for conducting a critical part of the required analyses. We thank the GASKI authorities for analysis and to everyone who has contributed.

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Correspondence to Halim Avci.

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Avci, H., Dokuz, U.E. & Avci, A.S. Hydrochemistry and groundwater quality in a semiarid calcareous area: an evaluation of major ion chemistry using a stoichiometric approach. Environ Monit Assess 190, 641 (2018). https://doi.org/10.1007/s10661-018-7021-8

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