Speciated measurements of atmospheric mercury plumes were obtained at an industrially 

impacted residential area of East St. Louis, IL. These plumes were found to result in extremely 

high mercury concentrations at ground level that were composed of a wide distribution of 

mercury species. Ground level concentrations as high as 235 ng m-3 for elemental mercury 

(Hg0) and 38 300 pg m-3 for reactive mercury species (reactive gaseous (RGM) plus particulate 

(PHg) mercury) were measured. The highest mercury concentrations observed during the study 

were associated with plumes that contained high concentrations of all mercury species (Hg0, 

RGM, and PHg) and originated from a source located southwest of the sampling site. Variations 

in proportions of Hg0/RGM/PHg among plumes, with Hg0 dominating some plumes and RGM 

and/or PHg dominating others, were attributed to differences in emissions from different 

sources. Correlations between mercury plumes and elevated NOx

 were not observed; however, 

a correlation between elevated SO2

 and mercury plumes was observed during some but not all 

plume events. Despite the presence of six coal-fired power plants within 60 km of the study site, 

wind direction data along with Hg/SO2 and Hg/NOx ratios suggest that high-concentration 

mercury plumes impacting the St. Louis−Midwest Particle Matter Supersite are attributable to 

local point sources within 5 km of the site. 

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Sources of Speciated Atmospheric Mercury at a Residential 

Neighborhood Impacted by Industrial Sources

Helen Manolopoulos ,† David C. Snyder ,† James J. Schauer ,*

†‡ Jason S. Hill ,§ Jay R. Turner ,§ Mark 

L. Olson ,ǁ and David P. Krabbenhoft ǁ

Environmental Chemistry and Technology Program and Department of Civil and Environmental Engineering, 

University of Wisconsin−Madison, Madison, Wisconsin 53706, Department of Energy, Environmental and 

Chemical Engineering, Washington University, St. Louis, Missouri 63130, and United States Geological 

Survey, Middleton, Wisconsin 53562 

Environ. Sci. Technol., 2007, 41 (16), pp 5626–5633

DOI: 10.1021/es0700348

Publication Date (Web): July 11, 2007

Copyright © 2007 American Chemical Society

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Published In Issue: August 15, 2007

Received for review January 5, 2007 

Revised manuscript received June 2, 2007 

Accepted June 3, 2007

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Impact of Closing Canada’s Largest Point-Source of Mercury 

Emissions on Local Atmospheric Mercury Concentrations

Chris S. Eckley, Matthew T. Parsons, Rachel Mintz, Monique Lapalme, 

Maxwell Mazur, Robert Tordon, Robert Elleman, Jennifer A. Graydon, 

Pierrette Blanchard, and Vincent St Louis

Environmental Science & Technology

2013 47 (18), 10339-10348

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