Geochemical Appraisal of Fluoride Laden Groundwater in Suri I and II Blocks, Birbhum District, West Bengal
Shreya Das and SK Nag*
Department of Geological Sciences, Jadavpur University, Kolkata-700032, India
- *Corresponding Author:
- Nag SK
Department of Geological Sciences
Tel: 033-2434 9446; 09433919962
E-mail: [email protected]
Received date: February 25, 2016; Accepted date: May 19, 2016; Published date: May 22, 2016
Citation: Das S, Nag SK (2016) Geochemical Appraisal of Fluoride – Laden Groundwater in Suri I and II Blocks, Birbhum District, West Bengal. J Earth Sci Clim Change. 7:358. doi:10.4172/2157-7617.1000358
Copyright: © 2016 Das S, et al. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
The present study has been carried out covering two blocks – Suri I and II in Birbhum district, West Bengal, India. The evaluation focuses on occurrence, distribution and geochemistry in twenty six water samples collected from bore wells spread across the entire study area homogeneously. Quantitative chemical analysis of groundwater samples collected from the present study area have shown that samples from two locations – Gangta and Dhalla contain fluoride greater than the permissible limit prescribed by WHO during both post monsoon and pre monsoon sampling sessions. Significant factor controlling geochemistry of groundwater has been identified to be rock – water interaction processes during both sampling sessions based on the results of Gibb’s Diagrams. Geochemical modeling studies have revealed that fluorite (CaF2) is indeed present as a significant fluoride bearing mineral in groundwaters of this study area. Calcite or CaCO3 is one of the most common mineral with which fluorite remains associated and saturation index calculations have revealed that the calcite – fluorite geochemistry is the dominant factor controlling fluoride concentration in this area during both post and pre monsoon. High fluoride waters have also been found to be of ‘bicarbonate’ type showing increase of sodium in water with decrease of calcium.