Mineralogy and geochemistry of shallow sediments of Sonargaon, Bangladesh and implications for arsenic dynamics

Focusing on the role of organic matter

Ashraf Ali Seddique, Harue Masuda, Muneki Mitamura, Keiji Shinoda, Toshiro Yamanaka, Shinji Nakaya, Kazi Matin Ahmed

Research output: Contribution to journalArticle

16 Citations (Scopus)

Abstract

Mineralogy and geochemistry of modern shallow sediments (up to 5. m thick) within the zone of water table fluctuations were studied to determine the likely sources and processes responsible for releasing As into groundwater. Samples were collected from different geological settings with varying groundwater As concentrations during dry (December 2005) and wet (September 2006) seasons at Sonargaon, Bangladesh. Stratigraphic sequences of the studied sediments showed three distinct lithofacies, viz. clayey-silt, silty-clay, and silty-very fine sand, corresponding to fine-grained overbank associations. Total As concentrations of shallow sediments ranged from 80% of the As was fixed in insoluble and organic phases, while the amount of As in reducible and acid-soluble phases was very low (

Original languageEnglish
Pages (from-to)587-599
Number of pages13
JournalApplied Geochemistry
Volume26
Issue number4
DOIs
Publication statusPublished - Apr 2011

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Geochemistry
Mineralogy
Arsenic
Biological materials
arsenic
Sediments
mineralogy
geochemistry
organic matter
Groundwater
sediment
groundwater
Silt
silty clay
lithofacies
water table
silt
Clay
Sand
Acids

ASJC Scopus subject areas

  • Environmental Chemistry
  • Pollution
  • Geochemistry and Petrology

Cite this

Mineralogy and geochemistry of shallow sediments of Sonargaon, Bangladesh and implications for arsenic dynamics : Focusing on the role of organic matter. / Seddique, Ashraf Ali; Masuda, Harue; Mitamura, Muneki; Shinoda, Keiji; Yamanaka, Toshiro; Nakaya, Shinji; Ahmed, Kazi Matin.

In: Applied Geochemistry, Vol. 26, No. 4, 04.2011, p. 587-599.

Research output: Contribution to journalArticle

Seddique, Ashraf Ali ; Masuda, Harue ; Mitamura, Muneki ; Shinoda, Keiji ; Yamanaka, Toshiro ; Nakaya, Shinji ; Ahmed, Kazi Matin. / Mineralogy and geochemistry of shallow sediments of Sonargaon, Bangladesh and implications for arsenic dynamics : Focusing on the role of organic matter. In: Applied Geochemistry. 2011 ; Vol. 26, No. 4. pp. 587-599.
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