Abstract
Strong spatial variability of arsenic (As) concentrations over short distances and depth intervals characterizes shallow aquifers in fluvial and deltaic deposits in As-affected sedimentary basins. A literature review of key publications on arsenic concentration levels shows that the dominant geomorphological setting of the As-prone areas consists of meandering river deposits with sand-prone fluvial point-bar deposits surrounded by clay-filled (clay plug) former meander bends (oxbow lakes). Analysis of the lithofacies succession and organic matter in two wells in such geomorphology along the Ganges River reveals that the clay-plug deposits have a high TOC of 1.5%. Present-day, partly in-filled oxbow lakes have a rich plant and animal life which will be preserved in the anoxic environment at the poorly oxygenized lower part of the lake (hypolimnion). The clay-plug sediment is identified as the locus of microbial respiration that triggers the reductive dissolution of FeOOH and associated desorption of As.
Original language | English |
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Title of host publication | Arsenic Research and Global Sustainability - Proceedings of the 6th International Congress on Arsenic in the Environment, AS 2016 |
Editors | P. Bhattacharya, M. Vahter, J. Jarsjö, J. Kumpiene, A. Ahmad, C. Sparrenbom, G. Jacks, M.E. Donselaar, J. Bundschuh, R. Naidu |
Publisher | CRC Press / Balkema - Taylor & Francis Group |
Pages | 27-28 |
Number of pages | 2 |
ISBN (Electronic) | 978-1-315-62943-8 |
ISBN (Print) | 978-1-138-02941-5 |
DOIs | |
Publication status | Published - 2016 |
Event | 6th International Congress on Arsenic in the Environment - http://www.as2016.se/, Stockholm, Sweden Duration: 19 Jun 2016 → 23 Jun 2016 Conference number: 6 |
Conference
Conference | 6th International Congress on Arsenic in the Environment |
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Abbreviated title | AS 2016 |
Country/Territory | Sweden |
City | Stockholm |
Period | 19/06/16 → 23/06/16 |