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Arsenic-free groundwater from palaeo-interfluvial aquifers

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  • Mohammad A. Hoque
    Dear All, For many years, the Bengal Basin has been known as the deltaic region worst afflicted by arsenic pollution of groundwater. The area s inhabitants
    Message 1 of 1 , Jun 7, 2012
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      Dear All,

      For many years, the Bengal Basin has been known as the deltaic region
      worst afflicted by arsenic pollution of groundwater. The area's
      inhabitants usually obtain their drinking water from hand-pumped tube
      wells that, through a combination of pragmatism and economics, are
      commonly drilled to a shallow depth. The wells are therefore typically
      screened in grey, channel, sands and their water is usually
      As-polluted.

      In some, possibly many, areas, drilling 30-50 feet deeper would have
      emplaced the screen in brown sand of a buried palaeo-interfluvial
      sequence, and so enable As-free water to be pumped for domestic
      supply.

      The extent of these palaeo-interfluvial deposits is not well known; in
      a paper available from <http://www.ucl.ac.uk/lag/publications>, Mohammad

      Hoque, and colleagues from the London Arsenic Group and IISWBM,
      Kolkata, through drilling and water sampling along a 32 km traverse
      running from east to west across southern West Bengal, reveal soming
      of the unrealized extent of such hidden palaeo-interfluvial aquifer
      zones in the Bengal Basin, and show again how their method of colour
      screening of hand-pumped tubewells can be used to infer subsurface
      sedimentology and the extent of As-pollution in groundwater.

      Full reference:

      Hoque MA, McArthur JM, Sikdar PK (2012). The palaeosol
      model of arsenic pollution of groundwater tested along a 32 km
      traverse across West Bengal,India. Science of the Total Environment, 431, 157-165. doi:10.1016/j.scitotenv.2012.05.038

      Sincerely,

      Mohammad Hoque

      London Arsenic Group,
      Earth Sciences,
      University College London,
      Gower Street,
      London WC1E 6BT
      +44 (0)20 7679 2364 (t);
      +44(0)7896341042 (m)
      e-mail: m.hoque at ucl.ac.uk
      Web: www.ucl.ac.uk/lag
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