Hydrochemical evaluation of groundwater quality of the Tista floodplain, Rangpur, Bangladesh

Abstract The Tista is a Trans-Himalayan river that flows through Sikkim and West Bengal states of India and Rangpur division of Bangladesh and finally falls into the Brahmaputra River. The presence of numerous abandoned channels with various degrees of aggradations indicates large migrations of the Tista River. The pH value of groundwater varies from 6.20 to 7.40 which indicate the slightly alkaline to acidic nature of the studied aquifers. The mean abundance of major cations is Na + > Ca +2 > Mg +2 > K + , whereas the major anions is HCO 3 − > Cl − > SO 4 −2 . Among the cations, Na + is the dominant and K + is the lowest constituents, whereas…