SOURCE OF HIGH FLUORIDE IN GROUND WATER AROUND ANUGUL, DHENKENAL DISTRICT, ORISSAS. DAS, B.C. METHA, P.K. DAS, S. K. SRIVASTAVA AND S.K. SAMANTAAbstract Flydrogeological investigations were carried out in the area around Anugul, Dhenkenal district, Orissa in the wake of the reported fluoride contamination of ground water. In .all 163 numbers of dug wells and 10 numbers of shallow tube wells were monitored. Wafer samples were collected and analysed from select dug wells, tube wells, major rivers, tanks, effluent channels ash pond etc. The ground water occurs under water table condition in the weathered residium and circulates through deeper fractured zones. High fluoride content (more than 1.5 mgit) was reeordt.d in the shallow ground water in scattered pockets, both in the basement complex and in the Gondwana sedimentaries. However the fluroide content in the ground water in the immediate vicinity of the effluent channels and the disposal pond of NALCO smelter plant was found within permissible limits. Hydrogeochemical studies point towards a possible geological source of high fluoride content in the ground water of the area.
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