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The Scientific World Journal
Volume 2014 (2014), Article ID 580723, 14 pages
Research Article

Gaseous Oxidized Mercury Dry Deposition Measurements in the Southwestern USA: A Comparison between Texas, Eastern Oklahoma, and the Four Corners Area

1Air Quality Analysis Section, US Environmental Protection Agency (EPA) Region 6, 1445 Ross Avenue, Dallas, TX 75202, USA
2National Exposure Research Laboratory, US EPA (E205-03), Research Triangle Park, NC 27711, USA
3Alion Science and Technology, Inc., P.O. Box 12313, Research Triangle Park, NC 27709, USA
4Houston Laboratory, US EPA Region 6, 10625 Fallstone Road, Houston, TX 77099, USA
5Cherokee Nation Environmental Programs, 208 E. Allen Road, Tahlequah, OK 74464, USA
6Eurofins Frontier Global Sciences, 11720 North Creek Parkway North, Suite 400, Bothell, WA 98011, USA

Received 10 December 2013; Accepted 22 January 2014; Published 6 April 2014

Academic Editors: A. W. Gertler, J. D. Herner, O. V. Rattigan, and L. Zhang

Copyright © 2014 Mark E. Sather et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


Gaseous oxidized mercury (GOM) dry deposition measurements using aerodynamic surrogate surface passive samplers were collected in central and eastern Texas and eastern Oklahoma, from September 2011 to September 2012. The purpose of this study was to provide an initial characterization of the magnitude and spatial extent of ambient GOM dry deposition in central and eastern Texas for a 12-month period which contained statistically average annual results for precipitation totals, temperature, and wind speed. The research objective was to investigate GOM dry deposition in areas of Texas impacted by emissions from coal-fired utility boilers and compare it with GOM dry deposition measurements previously observed in eastern Oklahoma and the Four Corners area. Annual GOM dry deposition rate estimates were relatively low in Texas, ranging from 0.1 to 0.3 ng/m2h at the four Texas monitoring sites, similar to the 0.2 ng/m2h annual GOM dry deposition rate estimate recorded at the eastern Oklahoma monitoring site. The Texas and eastern Oklahoma annual GOM dry deposition rate estimates were at least four times lower than the highest annual GOM dry deposition rate estimate previously measured in the more arid bordering western states of New Mexico and Colorado in the Four Corners area.