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Arsenic in de Dutch subsoil ...Introduction... Tony Appelo Welcome! Concentration patterns

Arsenic in de Dutch subsoil ...Introduction... Tony Appelo Welcome! Concentration patterns Introduction of the speakers. Arsenic concentrations in groundwater. D.J. Huisman, TNO. Pleistocene, low sealevel. In groundwater : about 5000 ppb Fe 2+ , 5 ppb As.

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Arsenic in de Dutch subsoil ...Introduction... Tony Appelo Welcome! Concentration patterns

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  1. Arsenic in de Dutch subsoil • ...Introduction... • Tony Appelo • Welcome! • Concentration patterns • Introduction of the speakers

  2. Arsenic concentrations in groundwater D.J. Huisman, TNO

  3. Pleistocene, low sealevel In groundwater: about 5000 ppb Fe2+, 5 ppb As

  4. Iron ore (’oer’) in Salland, NL Ratio Fe / As in FeOOH is about 1000

  5. Holocene, sealevel rise FeOOH transforms with S from seawater in pyrite, FeS2 Ratio Fe / As in FeS2 is about 1000

  6. Vegetation grows, peat develops...

  7. Peat is exploited

  8. FeS2 aerated, oxidizes FeS2 retransforms in solid FeOOH, FeCO3andSO42-, Fe2+, As Ratio Fe / As in water is ???

  9. What is the relation among As and SO42-, Fe2+, .... ??

  10. PROGRAM of the morning 11.00 dra Sophie Vermooten (TNO, Utrecht) : Regional occurrence of As in the Netherlands 11.30 Prof. dr Pieter Stuyfzand (VU, Amsterdam / KIWA, Nieuwegein): As in the Dutch drinkingwater production 12.00 drs Slavek Vaşak (TNO, Utrecht) : IGRAC's inventory of hazardous substances in groundwater on global scale 12.15 discussion 12.30 Lunch

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