Geochemical modelling approach was used to calculate the saturation state of some selected minerals, i.e., explaining the dissolution and precipitation reactions occurring in the groundwater. The dominant factors in controlling the groundwater hydrogeochemistry are evaporation and weathering in the study area. The results are correlated with standards classifications to deduce the hydrogeo-chemical phenomena. Results indicated that the spatial distribution of TDS, EC values and major ions in these groundwater samples considerably differ from one site to another mainly due to the lithological variations of the area. For this purpose, 98 samples were collected from the scattered shallow wells in the study area. Total dissolved solid (TDS), sodium adsorption ratio, residual sodium bicarbonate, permeability index and magnesium ratio were used for irrigation suitability assessment. The physicochemical parameters, including major cation and anion compositions, pH, total dissolved solid and electrical conductivity, were used to assess the suitability of groundwater quality for drinking purpose by comparing with the WHO and Iraqi standards. The present study focused on assessing the groundwater quality of the shallow aquifer in the northeastern Wasit Governorate, Iraq.
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