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Vikas, C.
- Hydrochemical Status of Groundwater in District Ajmer (NW India) with Reference to Fluoride Distribution
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Authors
Affiliations
1 Central Ground Water Board, KR, Kedaram Complex, Kesavadasapuram, Trivandrum - 4, IN
2 Central Ground Water Board, WR, Jaipur - 302 004, IN
3 Department of Geology, University of Rajasthan, Jaipur - 302 004, IN
1 Central Ground Water Board, KR, Kedaram Complex, Kesavadasapuram, Trivandrum - 4, IN
2 Central Ground Water Board, WR, Jaipur - 302 004, IN
3 Department of Geology, University of Rajasthan, Jaipur - 302 004, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 73, No 6 (2009), Pagination: 773-784Abstract
High fluoride in groundwater has been reported from many parts of India. However, a systematic study is required to understand the behaviour of fluoride in natural water in terms of local hydrogeological setting, climatic conditions and agricultural practices. Present study is an attempt to assess hydrogeochemistry of groundwater in Ajmer district in Rajasthan to understand the fluoride abundance in groundwater and to deduce the chemical parameters responsible for the dissolution activity of fluoride. Ajmer district falls in the semi-arid tract of central Rajasthan and is geologically occupied by Precambrian rocks (granites, pegmatites, gneisses, schists etc) where groundwater occurs under unconfined condition. A total of 153 well-water samples, representing an area of 8481 km2(further subdivided into eight blocks), were collected and chemically analyzed. The results of chemical analyses (pre-monsoon 2004) show fluoride abundance in the range of 0.12 to 16.9 mg/l with 66% of the samples in excess of permissible limit of 1.5 mg/l.Presence of fluoride bearing minerals in the host rock, the chemical properties like decomposition, dissociation and dissolution and their interaction with water is considered to be the main cause for fluoride in groundwater. Chemical weathering under arid to semi-arid conditions with relatively high alkalinity favours high concentration of fluoride in groundwater. Dental and skeletal fluorosis are prevalent in the study area which can be related to the usage of high fluoride groundwater for drinking. The suggested remedial measures to reduce fluoride pollution in groundwater include dilution by blending, artificial recharge, efficient irrigation practices and well construction.
Keywords
Groundwater, Fluoride, Dissolution, Alkalinity, Fluorosis, Ajmer District, Rajasthan.
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