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Hydrogeochemical evaluation and statistical analysis of groundwater of Sylhet, north-eastern Bangladesh

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Abstract

To investigate the hydrogeochemical characteristics of groundwater 23 shallow, 30 intermediate and 38 deep wells samples were collected from Sylhet district of Bangladesh, and analyzed for temperature, pH, Eh, EC, DO, DOC, Na+, K+, Ca2+, Mg2+, Cl, SO42−, NO3, HCO3, SiO2, Fe, Mn and As. Besides, 12 surface water samples from Surma and Kushiyara Rivers were also collected and analyzed to understand the influence into aquifers. Results revealed that, most of the groundwater samples are acidic in nature, and Na–HCO3 is the dominant groundwater type. The mean value of temperature, EC, Na+, K+, Ca2+, Mg2+, Cl, NO3 and SO42− were found within the range of permissible limits, while most of the samples exceeds the allowable limits of Fe, Mn and As concentrations. However, relatively higher concentration of Fe and Mn were found in deep water samples and reverse trend was found in case of As. The mean concentrations of As in shallow, intermediate and deep wells were 39.3, 25.3 and 21.4 µg/L respectively, which varied from 0.03 to 148 µg/L. From spatial distribution, it was found that Fe, Mn and As concentrations are high but patchy in northern, north-western, and south-western part of Sylhet region. The most influential geochemical process in study area were identified as silicate weathering, characterized by active cation exchange process and carbonate weathering, which thereby can enhance the elemental concentrations in groundwater. Pearson’s correlation matrix, principal component analysis and cluster analysis were also employed to evaluate the controlling factors, and it was found that, both natural and anthropogenic sources were influencing the groundwater chemistry of the aquifers. However, surface water has no significant role to contaminate the aquifers, rather geogenic factors affecting the trace elemental contamination. Thus it is expected that, outcomes of this study will provide useful insights for future groundwater monitoring and management of the study area.

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Acknowledgements

The study was carried out within the framework of IAEA/RCA regional project RAS/7/022. The first author is thankful to Dr. Pradeep K. Aggarwal and Dr. ManzoorAhmad Choudhry, Technical Officers, Isotope Hydrology Section, IAEA, Vienna, Austria for the guidance and suggestions provided during the technical discussions in different RCA project meetings. The authors are grateful to Sylhet City Corporation (SCC) and Department of Public Health Engineering (DPHE), Sylhet for giving access to the production wells and hand tube wells for doing the sampling work. SCC and DPHE also helped the project team in providing the hydrological and hydro-geological information.

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Ahmed, N., Bodrud-Doza, M., Islam, S.M.DU. et al. Hydrogeochemical evaluation and statistical analysis of groundwater of Sylhet, north-eastern Bangladesh. Acta Geochim 38, 440–455 (2019). https://doi.org/10.1007/s11631-018-0303-6

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