Sources of Mercury Wet Deposition in Eastern Ohio, USA
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- 作者：Gerald J. Keeler ; Matthew S. Landis ; Gary A. Norris ; Emily M. Christianson ; J. Timothy Dvonch
- 刊名：Environmental Science & Technology
- 出版年：2006
- 出版时间：October 1, 2006
- 年：2006
- 卷：40
- 期：19
- 页码：5874 - 5881
- 全文大小：325K
- 年卷期：v.40,no.19(October 1, 2006)
- ISSN：1520-5851
文摘
In the fall of 2002, an enhanced air monitoring site wasestablished in Steubenville, Ohio as part of a multi-yearcomprehensive mercury monitoring and source apportionmentstudy to investigate the impact of local and regionalcoal combustion sources on atmospheric mercury depositionin the Ohio River Valley. This study deployed advancedmonitoring instrumentation, utilized innovative analyticaltechniques, and applied state-of-the-art statistical receptormodels. This paper presents wet deposition data andsource apportionment modeling results from daily eventprecipitation samples collected during the calendar years2003-2004. The volume-weighted mean mercury concentrations for 2003 and 2004 were 14.0 and 13.5 ng L-1,respectively, and total annual mercury wet deposition was13.5 and 19.7 
g m-2, respectively. Two new EPA-implemented multivariate statistical models, positivematrix factorization (PMF) and Unmix, were applied to thedata set and six sources were identified. The dominantcontributor to the mercury wet deposition was found by bothmodels to be coal combustion (~70%). Meteorologicalanalysis also indicated that a majority of the mercurydeposition found at the Steubenville site was due to localand regional sources.
g m-2, respectively. Two new EPA-implemented multivariate statistical models, positivematrix factorization (PMF) and Unmix, were applied to thedata set and six sources were identified. The dominantcontributor to the mercury wet deposition was found by bothmodels to be coal combustion (~70%). Meteorologicalanalysis also indicated that a majority of the mercurydeposition found at the Steubenville site was due to localand regional sources.