Gaseous oxidized mercury dry deposition measurements in the Four Corners area and Eastern Oklahoma, U.S.A.

Developmental Biology

Jacque Adam¹  April Hathcoat¹  Mark E. Sather²  Gerard Van der Jagt⁴  Robert Brunette⁴  Johnson Mathew³  Clarence Jackson³  Luther Smith⁵  Larry Scrapper¹  Philip Ketcher¹  Danielle Keese¹  Jason Karlstrom⁴  Shaibal Mukerjee⁶  Ryan Callison¹ 

[1] Cherokee Nation Environmental Programs, 208 E. Allen Road, Tahlequah, Oklahoma 74464, USA$$;Air Quality Analysis Section, U.S. Environmental Protection Agency (EPA) Region 6, 1445 Ross Avenue, Dallas, Texas 75202, USA$$;Houston Laboratory, U.S. EPA Region 6, 10625 Fallstone Road, Houston, Texas 77099, USA$$;Frontier Global Sciences, 11720 North Creek Parkway North, Suite 400, Bothell, Washington 98011, USA$$;Alion Science and Technology, Inc., POB 12313, Research Triangle Park, North Carolina 27709, USA$$;National Exposure Research Laboratory, U.S. EPA (E205–03), Research Triangle Park, North Carolina 27711, USA$$

关键词: Air pollution;    arid area;    surrogate surface passive sampling;   

DOI  :  10.5094/APR.2013.017

学科分类：农业科学（综合）

来源: Dokuz Eylul Universitesi * Department of Environmental Engineering

【 摘 要 】

Gaseous oxidized mercury (GOM) dry deposition measurements using surrogate surface passive samplers were collected in the Four Corners area and eastern Oklahoma from August, 2009–August, 2011. Using data from a six site area network, a characterization of the magnitude and spatial extent of ambient mercury pollution in the arid Four Corners area was accomplished, which included the observation of a strong regional signature in the GOM dry deposition data set. GOM dry deposition rate estimates ranged from 0.4–1.0 ng/m² h at the six Four Corners area monitoring sites, while the GOM dry deposition rate estimate at the eastern Oklahoma monitoring site was lower at 0.2 ng/m² h. The highest GOM dry deposition estimates were recorded during the spring and summer while the lowest GOM dry deposition estimates were recorded during the fall and winter. During the second year of this study the highest annual GOM dry deposition estimate so far measured in the United States (U.S.) with smooth–edge surrogate surface passive samplers, 10 889 ng/m², was recorded at the Mesa Verde National Park site, a site at which the two– year cumulative GOM dry deposition estimate exceeded the mercury wet deposition estimate. GOM dry deposition estimates during the second year of the study were statistically significantly higher than the first year of the study at six of the seven sites. The data from this study provide a two–year baseline of GOM dry deposition data in the Four Corners area and eastern Oklahoma immediately before the current implementation of new U.S. power plant and boiler mercury control regulations which will significantly reduce mercury emissions from those two sectors of local and regional anthropogenic mercury emission sources.

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