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Kilis 7 Aralık Üniversitesi (2018)

Hydrochemical characteristics and quality parameters of Gaziantep underground underground water research

AVCI Ahmet Selçuk

Titre : Hydrochemical characteristics and quality parameters of Gaziantep underground underground water research

Gaziantep ili yeraltı sularının hidrokimyasal özellikleri ve kalite parametrelerinin araştırılması

Auteur : AVCI Ahmet Selçuk

Université de soutenance : Kilis 7 Aralık Üniversitesi

Grade : Master Thesis 2018

Résumé
Groundwater is a majör source of water for domestic, industrial and agricultural uses in many parts of Turkey, where arid environments are common. Groundwater was collected from 120 wells in rural areas of Gaziantep, in southeast Anatolia, to determine the concentration of majör ions and assess the suitability of the groundwater for various uses. 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 86% for all samples. The majörity 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 79% of raw samples ; Mg-HCO3 was the water type in 2.5% of the samples ; a mixed water type was found in 18% of the samples. Na-HCO3 water was identified in only one groundwater sample. The majör dissolved components of groundwater were, therefore, Ca(HCO3)2 and, to a lesser degree, Mg(HCO3)2. Dissolved NaCl, KCl, Na2SO4, MSO4 and M(NO3)2 also played majör or minor roles depending on the sampling point. The relationships between NO3- and M2+ (excess [Ca2++Mg2+] over [HCO3-]) were investigated. There was a strong linear relationship (R2>0.90) between molar concentrations of NO3- and M2+. Nitrogen compounds originating primarily from microbially-driven processes such as nitrification are expected to react with carbonate minerals (e.g., CaCO3) and migrate to groundwater via natural chemical reactions. 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). This study was a wide-ranging evaluation of groundwater within the Gaziantep region. The resulting water chemistry data 1) provides information on current water quality for multiple uses and 2) acts as a benchmark for future research.

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Page publiée le 8 janvier 2023