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Arsenic distribution, speciation and solubility in shallow groundwater of Owens Dry Lake, California

Ryu J, Gao S, Dahlgren R, Zierenberg R ...see all

Geochimica et Cosmochimica Acta, vol. 66, issue 17 (2002) pp. 2981-2994

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Generation of dust particles from the Owens Lake playa creates a severe air pollution hazard in the western United States. Much of the dust produced from the dry lakebed is derived from salts formed by evaporation of saline groundwater that often contains high concentrations of dissolved arsenic (As). The objectives of this research were to study the spatial distribution of dissolved arsenic in the shallow groundwater, and to examine factors affecting arsenic solubility and speciation. Evapoconcentration, redox potential, pH, and mineral solubility were examined as factors regulating arsenic biogeochemistry. Dissolved arsenic concentrations ranged from 0.1 to 96 mg L-1 and showed a general increase from the shoreline to the center of the lakebed. Arsenic concentrations were strongly correlated to electrical conductivity (EC) and ??D suggesting that evapoconcentration is an important process regulating total As concentrations. Arsenite [As(III)] was the dominant form of inorganic arsenic at Eh values less than about - 170 mV while arsenate [As(V)] was predominant at higher Eh values. Organic arsenic was negligible (

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  • Ji Hun Ryu

  • Suduan Gao

  • Randy A. Dahlgren

  • Robert A. Zierenberg

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