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Journal article: As contamination Gw Nawabganj BGD

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  • Suiling Wang
    http://highwire.stanford.edu/cgi/medline/pmid;16312955 Arsenic contamination of groundwater in Nawabganj, Bangladesh, focusing on the relationship with other
    Message 1 of 1 , Dec 4, 2005
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      http://highwire.stanford.edu/cgi/medline/pmid;16312955

      Arsenic contamination of groundwater in Nawabganj, Bangladesh, focusing on the
      relationship with other metals and ions. K Ohno, A Furukawa, K
      Hayashi, T Kamei, and Y Magara, Water Sci Technol, 2005;
      52(8): 87-94.

      Abstract: Serious arsenic contamination of groundwater in Bangladesh has been
      frequently reported and is of great concern. In this research, repeated water
      sampling from the same 10 tubewells in Nawabganj municipality, Bangladesh, was
      conducted and analysed, focusing on the seasonal variation of water quality and
      the relationship among arsenic and other metals and ions. For the seasonal
      variation of water quality, arsenic and iron concentrations were higher in the
      rainy season in general although the tendency was not consistent and it
      depended on the tubewell and the time. Correlation between arsenic and iron
      could not be observed in this study (r = -0.01) when using all cases. This was
      because no correlation was observed in the higher arsenic concentration range.
      Arsenic removal by co-precipitation with coexisting iron is known as one of the
      locally applicable techniques in Bangladesh, but the result from this study
      suggests that some additional treatments such as the extra injection of iron
      should be performed in some cases, especially where the arsenic concentration
      is high. The correlation between arsenic and other substances was also
      analysed. As a result, manganese (r = 0.37), molybdenum (r = 0.33) and sulfate
      ion (r = -0.33) significantly correlated with arsenic (p < 0.05). The negative
      correlation between arsenic and sulfate ion implies the dissolution of arsenic
      into groundwater under reductive conditions although there are some exceptional
      cases.
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