NDLI: Mobilization of arsenic in groundwater of Bangladesh: evidence from an incubation study

Content Provider	Springer Nature Link
Author	Anawar, H. M. Akai, J. Yoshioka, T. Kohira, E. Lee, J. Y. Fukuhara, H. Tari Kul Alam, M. Garcia Sanchez, A.
Copyright Year	2006
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(ΙΙ) concentrations. In the substrate-amended sediment suspensions incubated under anaerobic environment, there was a mobilization of As (maximum: 50–67 µg/l) and Fe(ΙΙ) (maximum: 182 µg/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(ΙΙ) 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 stimulated by the quantity of organic nutrient (glucose) used. The penetration of surface-derived organic matter into the shallow aquifer may stimulate the activity of microbial communities, thereby leading to a reduction of iron oxyhydroxide and As release.
Starting Page	553
Ending Page	565
Page Count	13
File Format	PDF
ISSN	02694042
Journal	Environmental Geochemistry and Health
Volume Number	28
Issue Number	6
e-ISSN	15732983
Language	English
Publisher	Kluwer Academic Publishers
Publisher Date	2006-11-21
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Arsenic Bacteria Biogeochemistry Groundwater Iron oxyhydroxide Organic nutrients Public Health/Gesundheitswesen Atmospheric Protection/Air Quality Control/Air Pollution Geochemistry
Content Type	Text
Resource Type	Article
Subject	Environmental Chemistry Medicine Geochemistry and Petrology Environmental Engineering Water Science and Technology

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