Abstract
Arsenic contamination in tube-well water in Ambagarh-Chowki block, central India, is restricted to local areas confined within the N-S trending Dongargarh rift zone. Affected areas are preferentially located in acid volcanics, close to shear zones and also in granites. Dug-wells even in severely contaminated areas generally have As concentration ≤10 μg/l. But in Kaurikasa area, several tube-wells and dug-wells are severely polluted. Weathered rocks and soils are also enriched in As from severely contaminated areas. As preferentially occurs in iron-enriched soil and similarly altered biotite, chlorite in granite. As sorbed in hydrated iron oxide (HFO) that preferably occurs in acid-leachable fraction and possibly as coatings on kaolinite, illite and goethite in soil or as coatings and along cleavage traces on weathered biotite and chlorite. Reductive dissolution of HFO released sorbed As to groundwater and enriched it in Fe. Pyrite in volcanic and shear zone rocks, although locally As-bearing is a minor source of As in groundwater.
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Acknowledgements
The authors acknowledge the analytical and logistic support received from Geological Survey of India. SKA and BAS thank CSIR for supporting research work on arsenic in groundwater.
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Acharyya, S.K., Shah, B.A., Ashyiya, I.D. et al. Arsenic contamination in groundwater from parts of Ambagarh-Chowki block, Chhattisgarh, India: source and release mechanism. Environ Geol 49, 148–158 (2005). https://doi.org/10.1007/s00254-005-0074-3
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DOI: https://doi.org/10.1007/s00254-005-0074-3