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HYDRO-GEOCHEMISTRY AND QUALITY ASSESSMENT OF DEEP GROUNDWATER IN SHYAMNAGAR UPAZILA, SOUTH-WESTERN BANGLADESH (Pages : 14 - 21)

T.K. DAS, M.A. MAMUN AND M.R. SHAIBUR

The Shyamnagar Upazila is located in southern most part of Bengal basin, which is characterized by extensive natural geochemical activities, brackish water and huge organic deposits. The hydro-geochemical data were collected from 50 deep aquifer water samples during July, 2018 were used for evaluating water quality and to determine process that control water chemistry. The collected samples were analyzed for pH, electric conductivity (EC), total dissolve solids (TDS), salinity, total hardness (TH), Na+, K+, Ca2+, Mg2+, SO42-, NO3-, PO4-, Cl-, and HCO3- concentration. The results illustrated that the dominations were in the order of Na+>Ca2+>Mg2+>K+ for cations and Cl->HCO3->PO4->NO3->SO42- for anions. The scatter diagram represented that Na+ion in groundwater comes from silicate weathering while both silicate and carbonate weathering were equally responsible for Ca2+ and Mg2+ ion. The piper diagram indicated that Na-HCO3, mixed NaCaHCO3 and NaCl are dominated in the hydro-geochemical facies. The Gibbs diagram showed that rock weathering was the main source of ions in groundwater, while sea water intrusion and precipitation has negligible effect on it. The Wilcox diagram indicated that most of the water sources were suitable for irrigation. The controlling factor of groundwater chemistry was mostly related to geologic factors, while the anthropogenic factors have not any significant effects.Download


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