Geochemical controls on fluoride concentrations in groundwater from alluvial aquifers of the Birbhum district, West Bengal, India

摘要: Abstract Groundwaters with high fluoride (F−) concentration up to 13.61 mg/L occur in some parts of the Quaternary alluvial aquifer Birbhum district, West Bengal, India. The F− groundwater zones are mainly located discharge areas Dwarka river basin, especially places where occurs at a depth 24–30 m within sediments, consisting micaceous sand, silt and clay. Soil samples were collected from 3 bore holes drilled about 30 m for geochemical analysis. Total sedimentary material measured 400 450 mg/kg deeper CS1 CS3 but no abnormal values found CS2. XRD, XRF total analyses sediments zone reveal that, presence intercalated zeolitic clay sand is major source groundwater. Furthermore, investigations laboratory analysis emphasize that sorption de-sorption different pH levels along ion-exchange mobilising factors pre- post-monsoon seasons. Most having fast recharge component either flowing canals or rainfall, contains relatively depleted δ18O content (− 5 − 4‰). However, has correlation Cl− shows more than one contaminant sources.