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					          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 Fe2+, 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, FeS2




                    Ratio Fe / As in FeS2 is about 1000
Vegetation grows, peat develops...
Peat is exploited
FeS2 aerated, oxidizes
FeS2 retransforms in solid FeOOH, FeCO3 and SO42-, Fe2+, As




                     Ratio Fe / As in water is ???
What is the relation among
         As and
   SO42-, Fe2+, .... ??
                   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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posted:10/8/2012
language:English
pages:10