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Spatial Analysis of Arsenic Groundwater Contamination: Bangladesh

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Spatial Analysis of Arsenic Groundwater Contamination: Bangladesh Danielle Eastman 12-4-06 Background Most severe arsenic problem in the world. Shallow wells ... – PowerPoint PPT presentation

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Title: Spatial Analysis of Arsenic Groundwater Contamination: Bangladesh


1
Spatial Analysis of Arsenic Groundwater
Contamination Bangladesh
  • Danielle Eastman
  • 12-4-06

2
Background
  • Most severe arsenic problem in the world.
  • Shallow wells installed
  • Area147,570 km2
  • Population 128 million people

3
  • Natural source of Arsenic
  • WHO drinking standard 10 ug/L
  • Bangladesh standard 50 ug/L
  • 97 drinking water is contaminated
  • 80 of population at risk to poisoning

4
Objectives
  • Identify spatial variations in arsenic, iron, and
    sediment types.
  • Is there a relationship between sediment type and
    arsenic levels?
  • What is the relationship between iron and
    arsenic?
  • What is the influence of the major river systems
    that run through Bangladesh?
  • Can these relationships support the hypothesis of
    arsenic mobilization and transport suggested by
    the BGS, as well as others?

5
Approach
  • Create Basemap
  • Create shapefiles of borehole data.
  • Join borehole data with basemap
  • Create maps of chemistry and geology based on
    borehole data
  • Used query information and spatial patterns to do
    analysis

6
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7
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8
Implications
  • Arsenic and iron concentrations do not reflect
    hypothesis about iron being a sink for arsenic.
  • The geology map gives a general idea of the
    influence of geology, but smaller scale analysis
    must be done to show the relationship between
    geology and arsenic.

9
References
  • Al-Muyeed, Abdullah, and Afrin, Rumana.
    Investigation of the efficiency of existing iron
  • and arsenic removal plants in Bangladesh. (2006).
    Journal of Water Supply Research and Technology,
    55 (4). 293-299.
  • British Geologic Survey (BGS) Natural
    Environmental Research Council. (2006) Water
  • Quality Data Retrieved November 15, 2006, from
    the groundwater arsenic problem in Bangladesh
    (phase 2) Website http//www.bgs.ac.uk/arsenic/ba
    ngladesh/datadownload.htm
  • ESRI. (2006). Map of Bangladesh. Retrieved
    November 15, 2006, from GIS and
  • Mapping Software Website http//arcdata.esri.com/
    data_downloader/DataDownloader?part10200
  • Hassan, M. Manzurul, Atkins, Peter J., and Dunn,
    Christine E. Social implications of
  • arsenic poisoning in Bangladesh. (2005). Social
    Science and Medicine, 61. 2201-2211.
  • Hossain, M. F. Arsenic Contamination in
    Bangladesh-An Overview. (2006). Agriculture,
  • Ecosystems, and Environment, 113, 1-16.
  • Hossain, Faisal and Sivakumar, Bellie. Spatial
    pattern of arsenic contamination in
  • shallow wells of Bangladesh regional geology and
    nonlinear dynamics. (2005) Stochastic
    Environmental Research and Risk Assessment, 20.
    66-76.
  • Mukhopadhyay, Basap, Mukherjee, P. K.,
    Bhattacharya, Debkumar, and Sengupta, S.
  • Delineation of arsenic-contamination zones in
    Bengal Delta, India a geographic information
    system and fractal approach. (2006).
    Environmental Geology, 49. 1009-1020.

10
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