Concentrations of a water soluble, gas-phase mercury species in ambient air: Results from measurements and modeling

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There are few reliable data on the speciation of Hg in ambient air, although this information is critical to understanding the fate of Hg once released from point sources. The water soluble species of Hg that are thought to exist in flue gases would be subject to far greater local removal rates than is elemental Hg vapor, but methods are lacing to quantify this species. The authors developed a method using refluxing mist chambers to measure the airborne concentrations of reactive gaseous mercury (RGM) in short-term samples under ambient conditions. The method exhibits an effective detection limit of 0.02 ng/m{sup ... continued below

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8 p.

Creation Information

Lindberg, S. E.; Stratton, W. J.; Pai, P. & Allan, M. A. December 31, 1997.

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  • Lindberg, S. E. Oak Ridge National Lab., TN (United States). Environmental Sciences Div.
  • Stratton, W. J. Earlham Coll., Richmond, IN (United States). Dept. of Chemistry
  • Pai, P. Atmospheric and Environmental Research, San Ramon, CA (United States)
  • Allan, M. A. Electric Power Research Inst., Palo Alto, CA (United States)

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Description

There are few reliable data on the speciation of Hg in ambient air, although this information is critical to understanding the fate of Hg once released from point sources. The water soluble species of Hg that are thought to exist in flue gases would be subject to far greater local removal rates than is elemental Hg vapor, but methods are lacing to quantify this species. The authors developed a method using refluxing mist chambers to measure the airborne concentrations of reactive gaseous mercury (RGM) in short-term samples under ambient conditions. The method exhibits an effective detection limit of 0.02 ng/m{sup 3} and a precision for ambient concentration levels of {+-}20--30%. Using a model that simulates atmospheric transport and fate of anthropogenic mercury emissions over the contiguous United States, the authors generated 24-hr RGM concentrations to compare to the measurement data. The average RGM concentrations measured with their mist chambers at sites in Tennessee (TN) and Indiana (IN) were 0.065 ng/m{sup 3} and 0.100 ng/m{sup 3}, respectively. These averages represent about 3% of total gaseous mercury (TGM), and RGM generally exceeds regional particulate Hg. The 24-hr model-simulated RGM concentration averages in the modeling grid cells representing TN and IN are 0.051 ng/m{sup 3} and 0.098 ng/m{sup 3} respectively, in good agreement with the data. The measured concentrations at the two sites exhibit weak positive correlations with temperature, solar radiation, O{sub 3}, SO{sub 2}, and TGM. These concentrations are high enough to suggest that RGM can play an important role in both wet and dry deposition on a regional scale.

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8 p.

Notes

OSTI as DE99000304

Source

  • Electric Power Research Institute (EPRI) conference, Washington, DC (United States), 1 Sep 1997

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  • Other: DE99000304
  • Report No.: ORNL/CP--99813
  • Report No.: CONF-9709302--
  • Grant Number: AC05-96OR22464
  • DOI: 10.2172/296860 | External Link
  • Office of Scientific & Technical Information Report Number: 296860
  • Archival Resource Key: ark:/67531/metadc685250

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Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

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Creation Date

  • December 31, 1997

Added to The UNT Digital Library

  • July 25, 2015, 2:20 a.m.

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  • Nov. 3, 2016, 6:51 p.m.

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Lindberg, S. E.; Stratton, W. J.; Pai, P. & Allan, M. A. Concentrations of a water soluble, gas-phase mercury species in ambient air: Results from measurements and modeling, report, December 31, 1997; Tennessee. (digital.library.unt.edu/ark:/67531/metadc685250/: accessed December 15, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.