Abstract
Aim: The geochemical quality analysis of groundwater in randomly selected Districts of Jimma Zone was studied. The study was carried out with the focus of characterization of the geochemical quality of the groundwater. Methods: Cross-sectional study was conducted from June 2016 to September 2016. A total of 28 groundwater samples were collected from seven Districts and analyzed for geochemical quality parameters by using standard procedures. The samples were characterized by using various ion relationships. Results: Based on the concentration, Na+ > Ca2+ > Mg2+ > K+ for cations and HCO3 > Cl > SO42 for anions. Monovalent cations (Na+ and K+) predominates the divalent cations (Ca2+ and Mg2+) and anions of weak acids (HCO3 and CO32) predominates anions of strong acids (SO42 and Cl). Na-HCO3 water is the most dominant followed by Na-Ca-HCO3 and Ca-Na-HCO3. The correlation between electrical conductivity (EC), total dissolved solid (TDS), Na+ and HCO3 was strong because of the dominance of Na+ and HCO3 in the groundwater. Carbonate and Silicate weathering are the main source of ions. Conclusion: Rock-water interaction is the major mechanism controlling the groundwater chemistry in the study area. To protect public health, periodic monitoring of groundwater quality is very important.
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