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Arsenic in shallow groundwater of Bangladesh: investigations from three different physiographic settings

Hasan, M. Aziz ; Ahmed, K. Matin ; Sracek, Ondra ; Bhattacharya, Prosun ; von Brömssen, Mattias ; Broms, Sandra ; Fogelström, Johan ; Mazumder, M. Lutful ; Jacks, Gunnar

Hydrogeology journal, 2007-12, Vol.15 (8), p.1507-1522 [Periódico revisado por pares]

Heidelberg: Berlin/Heidelberg : Springer-Verlag

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  • Título:
    Arsenic in shallow groundwater of Bangladesh: investigations from three different physiographic settings
  • Autor: Hasan, M. Aziz ; Ahmed, K. Matin ; Sracek, Ondra ; Bhattacharya, Prosun ; von Brömssen, Mattias ; Broms, Sandra ; Fogelström, Johan ; Mazumder, M. Lutful ; Jacks, Gunnar
  • Assuntos: Alluvial and deltaic aquifers ; Arsenic ; Civil engineering and architecture ; Groundwater pollution ; hydrochemistry ; Redox-buffering ; Samhällsbyggnadsteknik och arkitektur ; TECHNOLOGY ; TEKNIKVETENSKAP ; Vattenteknik ; Water engineering
  • É parte de: Hydrogeology journal, 2007-12, Vol.15 (8), p.1507-1522
  • Notas: http://dx.doi.org/10.1007/s10040-007-0203-z
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  • Descrição: Occurrences of arsenic (As) in the Bengal Basin of Bangladesh show close relationships with depositional environments and sediment textures. Hydrochemical data from three sites with varying physiography and sedimentation history show marked variations in redox status and dissolved As concentrations. Arsenic concentration in groundwater of the Ganges Flood Plain (GFP) is characteristically low, where high Mn concentrations indicate redox buffering by reduction of Mn(IV)-oxyhydroxides. Low DOC, [graphic removed] , [graphic removed] and high [graphic removed] and [graphic removed] concentrations reflect an elevated redox status in GFP aquifers. In contrast, As concentration in the Ganges Delta Plain (GDP) is very high along with high Fe and low Mn. In the Meghna Flood Plain (MFP), moderate to high As and Fe concentrations and low Mn are detected. Degradation of organic matter probably drives redox reactions in the aquifers, particularly in MFP and GDP, thereby mobilising dissolved As. Speciation calculations indicate supersaturation with respect to siderite and vivianite in the groundwater samples at MFP and GDP, but groundwater in the GFP wells is generally supersaturated with respect to rhodochrosite. Values of log PCO₂ at MFP and GDP sites are generally higher than at the GFP site. This is consistent with Mn(IV)-redox buffering suggested at the GFP site compared to Fe(III)-redox buffering at MFP and GDP sites.
  • Editor: Heidelberg: Berlin/Heidelberg : Springer-Verlag
  • Idioma: Inglês
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  • Realização: ABCD-USP USP   Logos de Redes Sociais: Freepik

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