Arsenic mobilization from iron oxyhydroxides is regulated by organic matter carbon to nitrogen (C:N) ratio
Abstract
Arsenic (As) is mobilized from delta and floodplain aquifer sediments throughout S.E. Asia via reductive dissolution of As bound to iron (Fe) oxyhydroxides. The reductive driving force is organic carbon, but its source and constitution is uncertain. Here batch incubation experiments were conducted to investigate the role of organic matter (OM) carbon:nitrogen (C:N) ratio on the mobilization of arsenic, Fe and N from As dosed, Fe oxyhydroxide coated sands. As mobilization into pore waters from the sand was strongly regulated by the C:N ratio of the OM, and also the concentration of OM present. The lower the C:N, the more As released. Fe and ammonium release were similarly dependent on the quality and quantity of OM, but Fe mobilization was more rapid and ammonium release slower than As suggesting that the mobilization of these 3 moieties although interdependent, were not directly linked. It was concluded that low C:N ratios for OM responsible for reducing aquifers were As in groundwater is observed were likely.
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Additional organic compounds tested in such studies are humic substances or water from a drainage tube and plant material such as ground bean leaves, barley straw or pine sawdust.
“Additional organic compounds that have been tested in such studies are humic substances or water from a drainage tube 22 and plant material such as ground bean leaves, barley straw or pine sawdust 23 .”
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 [23]
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Solid-phases and desorption processes of arsenic within Bangladesh sediments
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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
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
- Authors
- Solaiman, A. R. M., Meharg, A. A., Gault, A. G., & Charnock, J. M.
- Affiliations
- University of Aberdeen (GB)
- University of Manchester (GB)
- Daresbury Laboratory (GB)
- Corresponding author
- Solaiman, A.R.M.
- ORCID
- Meharg, A.A.
- Venue
- Environment International
- Publisher
- Elsevier BV
- Published
- 2009-04
- Volume
- 35
- Issue
- 3
- Pages
- 480-484
- ISSN
- 0160-4120 (ISSN-L)
- OpenAlex
- W2052965750
- Cited by
- 42
- References
- 3
- Citations by year
- 2026: 1 · 2025: 4 · 2024: 2 · 2023: 3 · 2022: 2 · 2021: 2 · 2020: 3 · 2018: 3 · 2017: 6 · 2016: 3 · 2015: 1 · 2014: 2 · 2013: 2
- FWCI
- 1.95
- Type
- journal article
- Language
- en
- Open access
- closed
- Locations
- Environment International (publishedVersion)
- PubMed (publishedVersion)
- DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion)
- Research Explorer (The University of Manchester) (submittedVersion)
- Research Portal (Queen's University Belfast) (submittedVersion)
- 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, iron oxyhydroxide, organic matter, C/N ratio, reductive dissolution, aquifer sediments, iron release, ammonium release, organic carbon, groundwater arsenic contamination
- MeSH terms
- Quaternary Ammonium Compounds, Arsenic, Asia, Southeastern, Carbon, Ferric Compounds, Iron, Nitrogen, Organic Chemicals, Geologic Sediments
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