Ambient Mercury Sources in Rochester, NY: Results from Principle Components Analysis (PCA) of Mercury Monitoring Network Data

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• 作者：Jiaoyan Huang ; Hyun-Deok Choi ; Philip K. Hopke ; Thomas M. Holsen
• 刊名：Environmental Science & Technology
• 出版年：2010
• 出版时间：November 15, 2010
• 年：2010
• 卷：44
• 期：22
• 页码：8441-8445
• 全文大小：186K
• 年卷期：v.44,no.22(November 15, 2010)
• ISSN：1520-5851

文摘

Continuous atmospheric measurements of speciated mercury (Hg) (elemental mercury (Hg⁰), reactive gaseous mercury (RGM), and particulate mercury (Hg_p)) were made in Rochester, NY from Dec 2007 to May 2009. Continuous measurements of ozone (O₃), sulfur dioxide (SO₂), carbon monoxide (CO), particulate matter (PM_2.5), and meteorological data were also available. A principle components analysis (PCA) of 3886 observations of 13 variables for the period identified six major factors. Melting snow was observed to be a source of Hg⁰ in winters. Positive correlations between RGM and O₃ in the spring and summer may be indicative of Hg⁰ oxidation. RGM concentrations increased simultaneously with SO₂ suggesting the influence of coal fired power plants (CFPP). The fifth factor (F5) containing O₃ (high negative loading), CO (positive loading), Hg⁰ and Hg_p (positive), and/or RGM (negative) was identified as a mobile source which was usually observed during morning rush hours (6:00−9:00 a.m.). The concentrations of the three mercury species from the direction of the CFPP were significantly reduced following the shutdown of this source.