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Hydrogeochemical Evaluation of Intermittent Alluvial Aquifers Controlling Arsenic and Fluoride Contamination and Corresponding Health Risk Assessment

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Abstract

Identification and management of safe groundwater supply in a high As and F contaminated region is a major challenge. This study provides comprehensive hydrogeochemical investigation results for a complex hydro-stratigraphy controlled soil aquifer, which is bound between the Shillong plateau and the Himalayan ranges in the North-Eastern region of India. In this study, distinct contaminated regions of As and F were identified in the post-monsoon (n = 94) and winter (n = 50) seasons groundwater samples. The maximum dissolved concentration of As was measured to be 71 µg L–1 in post-monsoon and 211 µg L–1 in winter season groundwater samples. Maximum F concentration was measured as 7 mg L–1 in post-monsoon and 6 mg L–1 in winter season groundwater samples. Identified minerals saturation, weathering and dissolution condition results were well corroborated with the hydrogeochemistry, Bivariate plot, Gibbs and Pourbaix diagrams results. Children of age below 18 years old, in total 20% (i.e. 6,511) and 25% (i.e. 3,627) of the residents were found to be more susceptible to arsenic ingestion effect. The results of health risk assessment showed that the population of age below 18 years old are prone to carcinogenic diseases as well as a symptoms of non-carcinogenic health risk due to daily consumption of As contaminated groundwater. The male population was found relatively more prone to As cancer risk than the female population. Overall, this study provides a critical result about the cause of high As and F concentration in groundwater and their health risk assessment. It seek to address a prime concern for the usage of groundwater source for drinking water in the Brahmaputra flood plain.

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Authors declared that no external organization data has used in this study.

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Acknowledgements

Partial financial support was received from the Department of Science and Technology and the European Union. We deeply acknowledge the public health engineering department, Assam for facilitating the field sampling and sharing useful information. We thank the Department of Chemical Engineering and Department of Civil Engineering, IIT Guwahati for providing the analytical laboratory facilities.

Funding

This work is funded by DST and EU through the LOTUS Project No: DST/IMRCD/India EU/LOTUS/208/(G) and EU Grant No 820881.

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Conceptualization: [CM and SS], Methodology: [CM and SS], Formal analysis and investigation: [SSS and SS], Writing—original draft preparation: [SSS], Writing—review and editing: [CM, SS and SSS], Funding acquisition: [SS and CM], Resources: [S and CM], Supervision: [CM and SS].

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Correspondence to Sandip S. Sathe or Senthilmurugan Subbiah.

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Authors declared no conflict of interest and competing interests.

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Sathe, S.S., Mahanta, C. & Subbiah, S. Hydrogeochemical Evaluation of Intermittent Alluvial Aquifers Controlling Arsenic and Fluoride Contamination and Corresponding Health Risk Assessment. Expo Health 13, 661–680 (2021). https://doi.org/10.1007/s12403-021-00411-x

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  • DOI: https://doi.org/10.1007/s12403-021-00411-x

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