Abstract
Fluoride contamination in groundwater is a major problem throughout the world as well as in India. High-fluoride content was reported in the hot springs of Atri and Tarbalo sites in Odisha, India, and residents of nearby villages showed the manifestations of fluorosis. Around 39% of the groundwater samples showed fluoride concentration > 1 mg/l, higher than the desirable limit specified by the WHO. The dominant chemical facies of groundwaters were ions of Ca-Mg-HCO3 and Ca-Na-Cl, which infers the lithological control over the hydrochemistry of this area. A strong correlation between fluoride and other major ions could not be found, suggesting that multiple processes are responsible for the enriched fluoride concentration observed in the study area. The major geochemical processes include dissolution of fluoride-bearing minerals from the rocks, evapotranspiration, agricultural input and mixing of cold groundwater with hot spring water containing high fluoride. The maximum fluoride exposure doses through drinking water from fluoride-contaminated tube wells were estimated to be 0.07 mg/kg/d for infants, 0.125 mg/kg/d for children and 0.06 mg/kg/d for adults, which are higher than the minimum risk level (0.05 mg/kg/d). Exposure doses of fluoride indicate that exposure risk is doubled for children in comparison to infants and adults, which might cause severe dental fluorosis and other ailments. Considering the environmental and hydrological set up of the study area, membrane defluoridation process can be suggested as the best remediation method. Nalgonda technique, dilution of fluoride-rich groundwater and better nutrition containing calcium and vitamin C are other possible options that can be included for early mitigation of fluoride contamination.
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Acknowledgements
The authors duly acknowledge the support by the RTAC-BRNS, Department of Atomic Energy, India (Project sanction No. 35/14/12/2016-BRNS/35049). The first author (Asmita Maitra) would like to thank the Ministry of Human Resource Development (MHRD), Department of Higher Education, New Delhi, India, for providing student fellowship. We sincerely thank Mr. Ajay Jaryal and Mr. S.N. Kamble of the Isotope Hydrology Section, Bhabha Atomic Research Centre for helping in the field work. Dr. U.K. Sinha (Head, Isotope Hydrology Section), Dr. H. J Pant (Head, Isotope and Radiation Application Division) and Dr. Pradeep Kumar Pujari (Group Director, Radiochemistry and Isotope Group) of the Bhabha Atomic Research Centre are duly acknowledged for their constant support and encouragement during the course of this project. The study has improved substantially from the comments of the handling editor and three anonymous referees.
*Original abstract online at https://link.springer.com/article/10.1007/s11356-020-10948-0