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Vertical variability of arsenic concentrations under the control of iron-sulfur-arsenic interactions in reducing aquifer systems

Pi, Kunfu ; Wang, Yanxin ; Postma, Dieke ; Ma, Teng ; Su, Chunli ; Xie, Xianjun

Journal of Hydrology, June 2018, Vol.561, pp.200-210 [Periódico revisado por pares]

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  • Título:
    Vertical variability of arsenic concentrations under the control of iron-sulfur-arsenic interactions in reducing aquifer systems
  • Autor: Pi, Kunfu ; Wang, Yanxin ; Postma, Dieke ; Ma, Teng ; Su, Chunli ; Xie, Xianjun
  • Assuntos: Arsenic Variability ; Redox Zonation ; Fe-S-As Interactions ; Reactive-Transport Model ; Groundwater ; Geography
  • É parte de: Journal of Hydrology, June 2018, Vol.561, pp.200-210
  • Descrição: High spatial variability of arsenic (As) concentration in geogenic As-contaminated groundwater has been commonly observed worldwide, but the underlying reasons remain not well understood. Selecting a sulfate-containing, As-affected aquifer at the Datong Basin, northern China as the study area and combining hydrogeochemical investigation and sediment extraction with reactive transport modeling, this work elucidated the roles of Fe-S-As interactions in regulating the vertical variation of As concentration in the groundwater. Dissolved As concentration varied between 0.05 and 18 μmol/L, but generally increased in the depth of 20–25 m and then decreased in 25–30 m. The high-As groundwater contained low Fe(II) (<0.007 mmol/L) and up to 15 μmol/L sulfide, in contrary to the S/SE Asian deltas/floodplains where high Fe(II) and As jointly occur in the groundwater devoid of sulfate reduction. The reductive dissolution of As-bearing Fe(III) oxides coupled to the degradation of organic...
  • Idioma: Inglês

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