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Hydrogeochemistry of co-occurring geogenic arsenic, fluoride and iodine in groundwater at Datong Basin, northern China

Pi, Kunfu ; Wang, Yanxin ; Xie, Xianjun ; Su, Chunli ; Ma, Teng ; Li, Junxia ; Liu, Yaqing

Journal of Hazardous Materials, 30 December 2015, Vol.300, pp.652-661 [Periódico revisado por pares]

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  • Título:
    Hydrogeochemistry of co-occurring geogenic arsenic, fluoride and iodine in groundwater at Datong Basin, northern China
  • Autor: Pi, Kunfu ; Wang, Yanxin ; Xie, Xianjun ; Su, Chunli ; Ma, Teng ; Li, Junxia ; Liu, Yaqing
  • Assuntos: Arsenic ; Fluoride ; Iodine ; Environmental Isotopes ; Geochemical Coupling ; Engineering ; Law
  • É parte de: Journal of Hazardous Materials, 30 December 2015, Vol.300, pp.652-661
  • Descrição: Abnormal levels of co-occurring arsenic (As), fluorine (F) and iodine (I) in groundwater at Datong Basin, northern China are geochemically unique. Hydrochemical, O and H characteristics of groundwater were analyzed to elucidate their mobilization processes. Aqueous As, F and I ranged from 5.6 to 2680 μg/L, 0.40 to 3.32 mg/L and 10.1 to 186 μg/L, respectively. High As, F and I groundwater was characterized by moderately alkaline, high HCO , Fe(II), HS and DOC concentrations with H AsO , F and I as the dominant species. The plots of O values and Cl/Br ratios versus Cl concentration demonstrate build-up of more oxidizing conditions and precipitation of carbonate minerals induced by vertical recharge and intensive evaporation facilitate As retention to Fe (hydr) oxides, but enhance F and I mobilization from host minerals. Under reducing conditions, As and I can be simultaneously released via reductive dissolution of Fe (hydr) oxides and reduction of As(V) and I(V) while F migration may be retarded due to effects of dissolution-precipitation equilibria between carbonate minerals and fluorite. With the prevalence of sulfate-reducing condition and lowering of HCO concentration, As and I may be sequestered by Fe(II) sulfides and F is retained to fluorite and on clay mineral surfaces.
  • Idioma: Inglês

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