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The global dimension of Arsenic in ground- and drinking water Chairman: Tony Appelo Welcome! Why, and what is the problem, some background Introduction.

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Presentation on theme: "The global dimension of Arsenic in ground- and drinking water Chairman: Tony Appelo Welcome! Why, and what is the problem, some background Introduction."— Presentation transcript:

1 The global dimension of Arsenic in ground- and drinking water Chairman: Tony Appelo Welcome! Why, and what is the problem, some background Introduction of the speakers

2 The Global Arsenic Problem Smedley and Kinniburgh, 2002, AG 17, 517

3 Bangladesh Groundwater DPHE and BGS, 2001

4 data from: DPHE and BGS, 2001

5 Bangladesh Standard: 0.05 mg/L. Drink 2 L → 0.1 mg As /day In rice: 0.03 - 0.3 mg/kg Eat 0.3 kg → 0.1 mg As /day (Kapaj et al., 2006, JESH 41, 2399)

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8 The hydration of Fe-oxide surfaces O O Fe H2OH2O surface site ≡FeOH ≡FeOH + H + ↔ ≡FeOH 2 + ≡FeOH - H + ↔ ≡FeO - Fe 2 O 3 surface

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10 pH = 6.76 5 5 3 3 2 redox forms in water: Arsenate anion, As(5) Arsenic acid, As(3)

11 Sorption of anions on ferrihydrite PZC

12

13 PROGRAM 14.15 dr Pauline Smedley (British Geol Survey): Arsenic in groundwater – natural sources, mobilisation controls and the question of human influences 15.00 Prof. dr Marie Vahter (Karolinska Institute): Arsenic in drinking water: threatening the health of millions? 15.45 Break 16.15 Tony Appelo: What is the origin of high As concentrations in groundwater? 16.45 Discussion 17.00 Closure, drinks, etc.

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