Reversible adsorption and flushing of arsenic in a shallow, Holocene aquifer of Bangladesh

The spatial heterogeneity of dissolved arsenic (As) concentrations in shallow groundwater of the Bengal Basin has been attributed to transport of As (and reactive carbon) from external sources or to the release of As from within grey sand formations. We explore the latter scenario in this detailed h...

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Bibliographic Details
Published in:Applied geochemistry 2017-02, Vol.77, p.142-157
Main Authors: Radloff, Kathleen A., Zheng, Yan, Stute, Martin, Weinman, Beth, Bostick, Benjamin, Mihajlov, Ivan, Bounds, Margaret, Rahman, M.Moshiur, Huq, M.Rezaul, Ahmed, Kazi M., Schlosser, Peter, van Geen, Alexander
Format: Article
Language:English
Subjects:
Adsorption
Arsenic
Bangladesh
Groundwater age dating
Hydrology
Push–pull tests
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Summary:The spatial heterogeneity of dissolved arsenic (As) concentrations in shallow groundwater of the Bengal Basin has been attributed to transport of As (and reactive carbon) from external sources or to the release of As from within grey sand formations. We explore the latter scenario in this detailed hydrological and geochemical study along a 300 m transect of a shallow aquifer extending from a groundwater recharge area within a sandy channel bar to its discharge into a nearby stream. Within the 10–20 m depth range, groundwater ages along the transect determined by the 3H–3He method increase from
ISSN:0883-2927
1872-9134
DOI:10.1016/j.apgeochem.2015.11.003