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

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Presentation transcript:

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

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

Holocene, sealevel rise FeOOH transforms with S from seawater in pyrite, FeS 2 Ratio Fe / As in FeS 2 is about 1000

Vegetation grows, peat develops...

Peat is exploited

FeS 2 aerated, oxidizes FeS 2 retransforms in solid FeOOH, FeCO 3 and SO 4 2-, Fe 2+, As Ratio Fe / As in water is ???

What is the relation among As and SO 4 2-, Fe 2+,.... ??

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

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