Chlorite-source of arsenic groundwater pollution in the Holocene aquifer of Bangladesh

Access this Article

Search this Article

Author(s)

Abstract

Three basic minerals, biotite, chlorite and amphibole, were mineralogically and chemically examined to specify primary host phase(s) of As in the aquifer sediments and verify the formation mechanism of As contaminated groundwater of Sonargaon, Bangladesh, where the highest As contaminated groundwater appears in actively recharging zones. Among those minerals, only the chlorite included As by μ-XRF analysis. Fe-rich and tritoctahedral nature indicated this chlorite termed chamosite. The chlorite was weathered to form goethite on the cleavage, however, the goethite did not host the As. Combining with the saturation of goethite in the groundwater (Itai <i>et al.</i>, 2008), <i>in situ</i> chemical weathering of the chlorite promoted by accelerated aerobic water infiltration is suggested to be the first stage of formation of the As contaminated groundwater of the Holocene aquifer. This study implies the importance of aerobic aquifer condition to promote the As release via decomposition of As-bearing detrital mineral(s) as the formation mechanism of As contaminated groundwater in the Ganges-Bramaptra-Meghna river basin.

Journal

  • GEOCHEMICAL JOURNAL

    GEOCHEMICAL JOURNAL 46(5), 381-391, 2012-10-01

    GEOCHEMICAL SOCIETY OF JAPAN

References:  48

Codes

  • NII Article ID (NAID)
    10031137501
  • NII NACSIS-CAT ID (NCID)
    AA00654975
  • Text Lang
    ENG
  • Article Type
    ART
  • ISSN
    00167002
  • NDL Article ID
    024025471
  • NDL Call No.
    Z53-R488
  • Data Source
    CJP  NDL  J-STAGE 
Page Top