Decoupling of As and Fe release to Bangladesh groundwater under reducing conditions. Part 1: Evidence from sediment profiles

Publication Type  Journal Article
Year of Publication  2004
Authors  Horneman, A.; Van Geen, A.; Kent, D. V.; Mathe, P. E.; Zheng, Y.; Dhar, R. K.; O'Connell, S.; Hoque, M. A.; Aziz, Z.; Shamsudduha, M.; Seddique, A. A.; Ahmed, K. M.
Journal Title  Geochimica Et Cosmochimica Acta
Volume  68
Issue  17
Pages  3459-3473
Journal Date  Sep
ISBN Number  0016-7037
Accession Number  ISI:000223593700002
LDEO Publication Number  6583
Key Words  microbial fe(iii) reduction; ganges-brahmaputra delta; visible-light spectra; arsenic mobilization; lacustrine sediments; mechanisms; bacterium; dispersal; oxides; biomineralization

This study reexamines the notion that extensive As mobilization in anoxic groundwater of Bangladesh is intimately linked to the dissolution of Fe oxyhydroxides on the basis of analyses performed on a suite of freshly collected samples of aquifer material. Detailed sediment profiles extending to 40 to 70 m depth below the surface were obtained at six sites where local groundwater As concentrations were known to span a wide range. The sediment properties that were measured include (1) the proportion of Fe(II) in the Fe fraction leached in hot 1.2 N HCl, (2) diffuse spectral reflectance, and (3) magnetic susceptibility.


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URL  <Go to ISI>://000223593700002