Fluorine distribution in waters of Nalgonda District, Andhra Pradesh, India
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- Ramamohana Rao, N.V., Rao, N., Surya Prakash Rao, K. et al. Geo (1993) 21: 84. doi:10.1007/BF00775055
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Geochemical and hydrochemical studies were conducted in Nalgonda District (A.P.), to explore the causes of high fluorine in waters, causing a widespread incidence of fluorosis in the local population. Samples of granitic rocks, soils, stream sediments, and waters were analyzed for F and other salient chemical parameters. Samples from the area of Hyderabad city were analyzed for comparison. The F content of waters in areas with endemic fluorosis ranges from 0.4 to 20 mg/l. The low calcium content of rocks and soils, and the presence of high levels of sodium bicarbonate in soils and waters are important factors favoring high levels of F in waters.