Abstract
This study investigated the relationship between near-surface lithology and the spatial variability of As concentrations using sediment grain-size analysis and electromagnetic induction survey in the southeast Bangladesh. It has been observed that the aquifers overlain by finer sediments have higher concentrations of As in groundwater, whereas As concentrations are remarkably low in aquifers having permeable sandy materials or thinner silt/clay layer at the surface. The near-surface lithology acts as a controlling factor for spatial distributions of groundwater As within the very shallow depths (<15 m). Shallow alluvial aquifers can provide low-As drinking water in many areas of the country when tube wells are properly installed after investigation of the overlying near-surface sediment attributes and hydraulic properties.
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Acknowledgments
The research work was supported by the “Bose Centre for Advanced Study and Research in Natural Sciences”, University of Dhaka, Bangladesh. The Authors are grateful to Dr. A. van Geen from LDEO, Columbia University for his kind permission to use the EM31 equipment. We acknowledge the comments and suggestions made by Mr. Yacob Rahim on the initial version of the manuscript. We thank Dr. Prosun Bhattacharya and an anonymous reviewer for their constructive comments and suggestions that helped to improve this manuscript.
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Hoque, M.A., Khan, A.A., Shamsudduha, M. et al. Near surface lithology and spatial variation of arsenic in the shallow groundwater: southeastern Bangladesh. Environ Geol 56, 1687–1695 (2009). https://doi.org/10.1007/s00254-008-1267-3
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DOI: https://doi.org/10.1007/s00254-008-1267-3