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Poisening by arsenic in drinking water

Poisening by arsenic in drinking water. WHO limit 10 μ g/L. Skin Cancer. Black Foot Disease. The Global Arsenic Problem. 70-100 mill people affected. Bangladesh Groundwater. N. Vietnam. red river. red river. transect. dyke. Fig 1. The Dan Phuong Transect PVC casing 60 mm Ø

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Poisening by arsenic in drinking water

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  1. Poisening by arsenic in drinking water WHO limit 10 μg/L Skin Cancer Black Foot Disease

  2. The Global Arsenic Problem 70-100 mill people affected

  3. Bangladesh Groundwater

  4. N. Vietnam

  5. red river red river transect dyke Fig 1

  6. The Dan Phuong • Transect • PVC casing 60 mm Ø • Variable depth -22 m • Screen 30 cm • Seal through clay layer

  7. O2 mmol/L clay Elevation m Distance m

  8. Fe2+ mmol/L clay Elevation m Distance m

  9. CH4 mmol/L clay Elevation m Distance m

  10. As-total, μmol/L clay Elevation m Distance m 1 μmol/L As = 75 ug/L As

  11. Projekt Indhold Kemi arsens geokemi org. stof nedbrydning og redox geokemisk modellering Fysik vandtransport i jordlag grundvandsmodel Biologi arsen forgiftning

  12. Kemi • Dataset one depth profile • Calculate charge balance • Calculate redox potential • Calculate mineral saturation (PHREEQC) • Interpret redox sequences

  13. pH = 6.76 V V III 2pe = -3pH + 21.14 III Equal activities

  14. Arsenic in groundwater at Dan Phuong

  15. Redox sequences

  16. Fysik • Dataset grundvandspotentialer mm • Beregn grundvandshastigheder vha Darcy’s lov • Grundvandsdatering vha radioisotoper • Beregn grundvands bevægelse ud fra masse balance

  17. red river red river transect dyke Fig 1

  18. Darcy’s law vH20 vH20 K = 10-4 m/s ε = 0.3

  19. Grundvandsdatering med radioaktive isotoper 0.5 m/yr DanPhuongModel7b.xls Fig 3

  20. The mass balance in a homogeneous aquifer

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