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Hydrogeochemical contrasts across the multi-level aquifers of Bengal basin in Matlab, Bangladesh: Implications for arsenic free and low-manganese drinking water sources
KTH, School of Architecture and the Built Environment (ABE), Sustainable development, Environmental science and Engineering.ORCID iD: 0000-0003-4350-9950
KTH, School of Architecture and the Built Environment (ABE), Sustainable development, Environmental science and Engineering.
KTH, School of Architecture and the Built Environment (ABE), Sustainable development, Environmental science and Engineering.
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2016 (English)In: Arsenic Research and Global Sustainability - Proceedings of the 6th International Congress on Arsenic in the Environment, AS 2016, CRC Press/Balkema , 2016, p. 45-46Conference paper, Published paper (Refereed)
Abstract [en]

Targeting shallow, intermediate-deep and deep aquifers, piezometers nests were installed at 15 locations in the Matlab region, an As hotspot in southeastern Bangladesh. Groundwater levels and water quality were monitored for over a three years period. Stable isotopic composition was used to identify the hydrogeological characteristics of different aquifers, hydraulic connectivity between the contaminated and safe aquifers. Within the shallow depth (up to 100m), two aquifers (Aquifer-1 and Aquifer-2) were identified, and groundwater from Aquifer-1 indicated consistently high As concentration was found to be As-enriched (median As levels upto 714 μg/L). Considerable variability in As concentrations were observed in Aquifer-2 wells (6–30 μg/L) comprising relatively oxidized or less reduced red and off-white sands. The intermediate-deep and deep aquifers were found to contain very low As concentration and these aquifers are hydraulically separated from the shallow aquifers. Groundwater depth and elevation and stable isotope signatures also reflect that intermediate-deep and deep aquifers, in most places belong to the same hydrostratigraphic unit (Aquifer-3). © 2016 Taylor & Francis Group, London.

Place, publisher, year, edition, pages
CRC Press/Balkema , 2016. p. 45-46
Keywords [en]
Aquifers, Arsenic, Groundwater, Groundwater pollution, Hydrogeology, Isotopes, Potable water, Sustainable development, Water quality, Drinking water sources, Ground water depths, Hydraulic connectivity, Hydrogeochemical, Hydrogeological characteristics, Shallow aquifers, Stable isotopes, Stable isotopic compositions, Groundwater resources
National Category
Earth and Related Environmental Sciences
Identifiers
URN: urn:nbn:se:kth:diva-207569Scopus ID: 2-s2.0-85016943267ISBN: 9781138029415 (print)OAI: oai:DiVA.org:kth-207569DiVA, id: diva2:1102686
Conference
6th International Congress on Arsenic in the Environment, AS 2016, 19 June 2016 through 23 June 2016
Note

Conference code: 175559; Export Date: 22 May 2017; Conference Paper; Funding details: 75000854, Sida, Styrelsen för Internationellt Utvecklingssamarbete; Funding text: We acknowledge the Swedish International Development Cooperation Agency (Sida) Global Program (Contribution 75000854). QC 20170530

Available from: 2017-05-30 Created: 2017-05-30 Last updated: 2017-05-30Bibliographically approved

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Bhattacharya, P.

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