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Proc. IAHS, 379, 351-356, 2018
https://doi.org/10.5194/piahs-379-351-2018
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.
Pre-conference publication
05 Jun 2018
Fluoride in groundwater: a case study in Precambrian terranes of Ambaji region, North Gujarat, India
Rudra Mohan Pradhan and Tapas Kumar Biswal Department of Earth Sciences, Indian Institute of Technology Bombay, Powai-400076, India
Abstract. Fluoride is one of the critical ions that influence the groundwater quality. World Health Organization (WHO, 1970) and Bureau of Indian Standards (BIS, 1991) set an upper limit of 1.5 mg L−1 in F concentration for drinking water purpose and above affects teeth and bones of humans. The presence of fluoride in groundwater is due to an interaction of groundwater and fluoride bearing rocks. Fluoride rich groundwater is well known in granitic aquifers in India and elsewhere. Generally, the concentration of F in groundwater is controlled by local geological setting; leaching and weathering of bedrock and climatic condition of an area. The main objective of the present study is to assess the hydrogeochemistry of groundwater and to understand the abundance of F in groundwater in hard rock terranes of Ambaji region, North Gujarat. A total of forty-three representative groundwater samples were collected and analyzed for major cations and anions using ICP-AES, Ion Chromatograph (Metrohm 883 Basic IC Plus) and titration methods. The F concentration in groundwater of this study area ranges from 0.17 to 2.7 mg L−1. Among, twenty groundwater samples have fluoride exceeding the maximum permissible limit as per the BIS (1.5 mg L−1). It is also noticed that residents of this region are affected by dental fluorosis. The general order of the dominance of major cations and anions are Ca2+ > Mg2+ > Na+ > K+ and HCO3 > Cl > F respectively. Geochemical classification of groundwater shows most of the samples are the alkaline earth-bicarbonate type. The semi-arid climatic conditions of the region, the dominance of granitoid-granulite suite rocks and the fracture network in the disturbed and brittle zone has facilitated the development of potential aquifers and enrichment in F concentration in this area. The concentration of fluoride is due to high evaporation rate, longer residence time in the aquifer zone, intensive and long term pumping for irrigation.
Citation: Pradhan, R. M. and Biswal, T. K.: Fluoride in groundwater: a case study in Precambrian terranes of Ambaji region, North Gujarat, India, Proc. IAHS, 379, 351-356, https://doi.org/10.5194/piahs-379-351-2018, 2018.
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Fluoride is one of the critical ions that influence the groundwater quality. The presence of fluoride in groundwater is due to an interaction of groundwater and fluoride bearing rocks. The main objective of the study is to assess the hydrogeochemistry of groundwater and to understand the abundance of F in groundwater. It reveals that the concentration of fluoride is due to high evaporation rate, longer residence time in the aquifer zone, intensive and long term pumping for irrigation purpose.
Fluoride is one of the critical ions that influence the groundwater quality. The presence of...
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