Mobilization of arsenic in groundwater of Bangladesh: evidence from an incubation study
Abstract
The extensive extraction of arsenic (As)-contaminated groundwaters for drinking, household and agricultural purposes represents a serious health concern in many districts of Bangladesh. This laboratory-based incubation study investigated the sources and mechanisms of As mobilization in these groundwaters. Several incubation studies were carried out using sediments collected from the Bangladesh aquifer that were supplemented, or not, with different nutrients, followed by an analysis of the sediment suspensions for pH, ORP (oxidation-reduction potential), EC (electrical conductivity) and As and Fe(II) concentrations. In the substrate-amended sediment suspensions incubated under anaerobic environment, there was a mobilization of As (maximum: 50-67 microg/l) and Fe(II) (maximum: 182 microg/l), while the ORP value decreased immediately and drastically (as much as -468 mV to -560 mV) within 5-6 days. In the sediment suspensions incubated under control and aerobic conditions, no significant As mobilization occurred. The simultaneous mobilization of As and Fe(II) from sediments is a strong indication that their mobilization resulted from the reduction of Fe oxyhydroxide by the enhanced activity of indigenous bacteria present in the sediments; this phenomenon also provides insights on the mobilization mechanism of As in groundwater. The concentrations of As in the sediments used in the incubation studies were strongly linked to the gradients of redox potential development that was sti…
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Organic matter plays a key role in As mobilization, in particular as electron donor for microorganisms.
“Natural organic matter (NOM) can contribute to arsenic (As) mobilization as an electron donor for microbially-mediated reductive dissolution of As-bearing Fe(III) (oxyhydr)oxides.”
From Role of in Situ Natural Organic Matter in Mobilizing As during Microbial Reduction of FeIII-Mineral-Bearing Aquifer Sediments from Hanoi (Vietnam). (2020) · cites this paper as [14]
Cites
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Phylogenetic analysis of dissimilatory Fe(III)-reducing bacteria
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Mineralogical and geomicrobiological investigations on groundwater arsenic enrichment in Bangladesh
Akai, J., Izumi, K., Fukuhara, H., Masuda, H., Nakano, S., Yoshimura, T., Ohfuji, H., Md Anawar, H., & Akai, K. (2004) · Applied Geochemistry · doi:10.1016/j.apgeochem.2003.09.008 · Cited by 253 · see citing works
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Glodowska, M., Stopelli, E., Schneider, M., Lightfoot, A., Rathi, B., Straub, D., Patzner, M., Duyen, V. T., AdvectAs Team Members, Berg, M., et al. (2020) · Environmental Science & Technology · doi:10.1021/acs.est.9b07183 · Cited by 91 · see citing works
Biodegradable organic carbon in sediments of an arsenic-contaminated aquifer in Bangladesh
Neumann, R. B., Pracht, L. E., Polizzotto, M. L., Badruzzaman, A. B. M., & Ali, M. A. (2014) · Environmental Science & Technology Letters · doi:10.1021/ez5000644 · Cited by 77 · see citing works
Is organic matter a source or redox driver or both for arsenic release in groundwater?
Anawar, H. M., Tareq, S. M., & Ahmed, G. (2013) · Physics and Chemistry of the Earth, Parts A/B/C · doi:10.1016/j.pce.2013.04.009 · Cited by 60 · see citing works
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- Authors
- Anawar, H. M., Akai, J., Yoshioka, T., Konohira, E., Lee, J. Y., Fukuhara, H., Tari Kul Alam, M., & Garcia-Sanchez, A.
- Affiliations
- Consejo Superior de Investigaciones Científicas (ES)
- Niigata University (JP)
- Research Institute for Humanity and Nature (JP)
- Nagoya University (JP)
- Corresponding author
- Anawar, H. M.
- Venue
- Environmental Geochemistry and Health
- Published
- 2006-11-21
- Volume
- 28
- Issue
- 6
- Pages
- 553-565
- ISSN
- 0269-4042 (ISSN-L)
- 1573-2983
- OpenAlex
- W2059635133
- Cited by
- 59
- References
- 3
- Citations by year
- 2025: 1 · 2024: 3 · 2023: 3 · 2022: 5 · 2021: 2 · 2020: 3 · 2019: 3 · 2018: 2 · 2017: 2 · 2016: 6 · 2015: 3 · 2014: 3 · 2013: 4 · 2012: 4
- FWCI
- 2.83
- Type
- journal article
- Language
- en
- Open access
- closed
- Licence
- www.springer.com/tdm (tdm)
- Locations
- Environmental Geochemistry and Health (publishedVersion)
- PubMed (publishedVersion)
- Topics
- Physical Sciences › Environmental Science › Environmental Chemistry › Arsenic contamination and mitigation
- Physical Sciences › Environmental Science › Environmental Chemistry › Mine drainage and remediation techniques
- Physical Sciences › Environmental Science › Pollution › Heavy metals in environment
- Keywords
- arsenic mobilization, groundwater contamination, iron(II) release, iron oxyhydroxide reduction, microbial reduction, redox potential, sediment incubation, drinking water
- MeSH terms
- Arsenic, Bangladesh, Ferric Compounds, Fertilizers, Nitrogen Isotopes, Water Movements, Water Pollutants, Chemical, Geologic Sediments
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