Sources of deep groundwater salinity in the southwestern zone of Bangladesh |
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| Authors: | Mirza A T M Tanvir Rahman Ratan Kumar Majumder Syed Hafizur Rahman Md Abdul Halim |
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| Institution: | (1) Department of Environmental Sciences, Jahangirnagar University, Savar, Dhaka, Bangladesh;(2) Institute of Nuclear Science and Technology, AERE, Savar, GPO Box 3787, Dhaka, 1000, Bangladesh; |
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| Abstract: | Twenty groundwater samples were collected from two different areas in Satkhira Sadar Upazila to identify the source of salinity
in deep groundwater aquifer. Most of the analyzed groundwater is of Na–Cl–HCO3 type water. The trends of anion and cation are Cl− > HCO3
− > NO3
− > SO4
2− and Na+ > Ca2+ > Mg2+ > K+, respectively. Groundwater chemistry in the study area is mainly governed by rock dissolution and ion exchange. The dissolved
minerals in groundwater mainly come from silicate weathering. The salinity of groundwater samples varies from ~1 to ~5%, and
its source is possibly the paleo-brackish water which may be entrapped during past geologic periods. |
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