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    Arsenic distribution along different hydrogeomorphic zones in parts of the Brahmaputra River Valley, Assam (India)

    Access Status
    Fulltext not available
    Authors
    Choudhury, R.
    Mahanta, C.
    Verma, S.
    Mukherjee, Abhijit
    Date
    2017
    Type
    Journal Article
    
    Metadata
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    Citation
    Choudhury, R. and Mahanta, C. and Verma, S. and Mukherjee, A. 2017. Arsenic distribution along different hydrogeomorphic zones in parts of the Brahmaputra River Valley, Assam (India). Hydrogeology Journal. 25 (4): pp. 1153-1163.
    Source Title
    Hydrogeology Journal
    DOI
    10.1007/s10040-017-1584-2
    ISSN
    1431-2174
    URI
    http://hdl.handle.net/20.500.11937/67109
    Collection
    • Curtin Research Publications
    Abstract

    The spatial distribution of arsenic (As) concentrations along three classified hydrogeomorphological zones in the Brahmaputra River Valley in Assam (India) have been investigated: zone I, comprising the piedmont and alluvial fans; zone II, comprising the runoff areas; and zone III, comprising the discharge zones. Groundwater (150 samples) from shallow hand-pumped and public water supply wells (2–60 m in depth) was analysed for chemical composition to examine the geochemical processes controlling As mobilization. As concentrations up to 0.134 mg/L were recorded, with concentrations below the World Health Organization and the Bureau of Indian Standards drinking-water limits of 0.01 mg/L being found mainly in the proximal recharge areas. Eh and other redox indicators (i.e., dissolved oxygen, Fe, Mn and As) indicate that, except for samples taken in the recharge zone, groundwater is reducing and exhibits a systematic decrease in redox conditions along the runoff and discharge zones. Hydrogeochemical evaluation indicated that zone I, located along the proximal recharge areas, is characterized by low As concentration, while zones II and III are areas with high and moderate concentrations, respectively. Systematic changes in As concentrations along the three zones support the view that areas of active recharge with high hydraulic gradient are potential areas hosting low-As aquifers.

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