Arsenic release from biotite into a Holocene groundwater aquifer in Bangladesh

Ashraf Ali Seddique, Harue Masuda, Muneki Mitamura, Keiji Shinoda, Toshiro Yamanaka, Takaaki Itai, Teruyuki Maruoka, Kenji Uesugi, Kazi Matin Ahmed, Dipak Kumar Biswas

    Research output: Contribution to journalArticlepeer-review

    88 Citations (Scopus)


    Continuous core sediments (to a depth of 90.1 m) taken at a transitional area of Holocene and Pleistocene deposits in Sonargaon, Bangladesh were characterized for their mineralogy and chemistry. Among the sediments of the lower part of the Holocene aquifer (depth: 18-29 m), where most domestic wells are installed, As is mostly fixed in biotite and organic phases. A positive correlation of As concentration with those of Al and Fe but not that of total organic C clearly suggests that biotite is a primary source of As. Although microbial reduction-dissolution of As-containing Fe oxyhydroxides is thought to cause As-enriched groundwater in the Ganges-Brahmaputra-Meghna delta plain, the authors conclude that chemical weathering of biotite is the primary formation mechanism and prevailing reducing conditions contribute to the expansion of As-enriched groundwater in the study area.

    Original languageEnglish
    Pages (from-to)2236-2248
    Number of pages13
    JournalApplied Geochemistry
    Issue number8
    Publication statusPublished - Aug 2008

    ASJC Scopus subject areas

    • Environmental Chemistry
    • Pollution
    • Geochemistry and Petrology


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