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MECHANISMS AND SOURCES OF HYDROCHEMISTRY IN SOUTH-WEST COASTAL AQUIFER OF BANGLADESH
By: S. M. Shafiuzzaman, Khondaker Emamul Haque
Key Words: Groundwater, aquifer system, mechanisms, sources, hydro chemical, coastal area, Bangladesh.
JLES-Vol-10-No-P-1-8, December 2015
AbstractIn the study, the mechanisms and sources of hydrochemistry in groundwater of the south-west coastal area in Satkhira district of Bangladesh have been evaluated based on the major chemical compositions of the groundwater. In this context 55 groundwater samples have been analyzed in the study. Most of the water samples contain high Na+ and Cl–concentration , while other chemical constituents such as Ca2+,Mg2+, K+, HCO 2-, NO – and SO 2- are within the permissible limit of WHO (2006) recommended values as a drinking water. Average TDS value
are within the range of 243.70 to 5011.50 mg/l which is few above the WHO permissible limit. Ionic distribution of these constituents in groundwater of the area has a definite special trend, which constitute the significant parts of the total dissolved solids in groundwater of the area. The CEV values of groundwater samples are within the range of -0.003 to 0.7878, which represent the ground waters are mainly inland origin and sea water mixing low to medium salty waters in some well locations of the area. The representing chemical data in Gibb’s diagram which
indicates that 35 out of 55 samples are their chemical constituent under the influence of rock dominance and 20 samples are influenced by evaporation and crystallization processes. From the bivariate plot of Na+ -Cl– (meq/l) versus Ca2++ Mg2+ – HCO 2--SO 2- (meq/l), the slope value of -0.17, which indicates that ion exchange was taking place in groundwater of the area.
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S. M. Shafiuzzaman, Khondaker Emamul Haque
MECHANISMS AND SOURCES OF HYDROCHEMISTRY IN SOUTH-WEST COASTAL AQUIFER OF BANGLADESH
JLES-Vol-10-No-P-1-8, December 2015
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