Manolopoulos Helen, Snyder David C, Schauer James J, Hill Jason S, Turner Jay R, Olson Mark L, Krabbenhoft David P
Environmental Chemistry and Technology Program and Department of Civil and Environmental Engineering, University of Wisconsin-Madison, Madison, Wisconsin 53706, USA.
Environ Sci Technol. 2007 Aug 15;41(16):5626-33. doi: 10.1021/es0700348.
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 NO(x) 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/NO(x) 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.
在美国伊利诺伊州东圣路易斯一个受工业影响的居民区，对大气汞羽流进行了形态测量。发现这些汞羽流导致地面汞浓度极高，且汞形态分布广泛。测量到的元素汞（Hg0）地面浓度高达235纳克/立方米，活性汞形态（活性气态汞（RGM）加颗粒汞（PHg））的地面浓度高达38300皮克/立方米。研究期间观测到的最高汞浓度与包含所有汞形态（Hg0、RGM和PHg）高浓度且源自采样点西南方向一个源的汞羽流有关。不同汞羽流中Hg0/RGM/PHg比例存在差异，有些汞羽流中Hg0占主导，而另一些汞羽流中RGM和/或PHg占主导，这归因于不同源排放的差异。未观测到汞羽流与NO(x)升高之间的相关性；然而，在部分但并非所有羽流事件中观测到了SO2升高与汞羽流之间的相关性。尽管在研究地点60公里范围内有6座燃煤发电厂，但风向数据以及Hg/SO2和Hg/NO(x)比值表明，影响圣路易斯 - 中西部颗粒物超级站点的高浓度汞羽流归因于该地点5公里范围内的本地点源。
