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Fluoride and other Inorganic Parameters in Drinking Water of Tube Well, Ring Well and PHE of Hojai Sub-Division of Nagaon District, Assam, India

Shilpi Mitra and Satyajeet Kumar

The ground water quality of drinking water of tube well, ring well and PHE of Hojai sub-division of Nagaon, district, Assam, has been studied with special reference to the presence of fluoride. The concentration of fluoride ion is determined by SPADNS colorimetric analysis. Most of Fluoride levels were within permissible limits, whereas a ten water samples has higher concentration of fluoride than permissible limit (1 mg/L, WHO) Fluoride content have positive correlation with Na’ and K’ and negative correlation with Mg2+, Ca2+ and total hardness (TH). Fluoride showed fairly good positive correlation with depth of sources. The main source of fluoride comes into contact with ground water from its source of origin, the rock minerals. The concentration of fluoride in groundwater basically depends on easily weathered fluoride bearing minerals, the accessibility of circulating water to fluoride bearing minerals, extent of fresh water exchange in an aquifer, evaporation and evapotranpiration, formation of ionic compound such as CaSO4, CaHCO3 etc. and complexing of F with Al, Be, Ferric ions.