Department of Chemistry and Biochemistry, University of Mississippi, University, MS 38677, USA.
Chemosphere. 2013 Nov;93(9):1694-700. doi: 10.1016/j.chemosphere.2013.05.039. Epub 2013 Jun 14.
Gaseous elemental mercury (GEM), gaseous oxidized mercury (GOM) and particulate bound mercury (PBM) were measured on the University of Mississippi campus from July 2011 to June 2012. It is believed to be the first time that concentrations of atmospheric mercury species have been documented in northern Mississippi, and at a location with relatively large and sudden swings in population. The mean concentration (±1 SD) of GEM was 1.54±0.32 ng m(-3); levels were lower and generally more stable during the winter (1.48±0.22) and spring (1.46±0.27) compared with the summer (1.56±0.32) and fall (1.63±0.42). Mean concentrations for GOM and PBM were 3.87 pg m(-3) and 4.58 pg m(-3), respectively; levels tended to be highest in the afternoon and lowest in the early morning hours. During the fall and spring academic semesters concentrations and variability of GOM and PBM both increased, possibly from vehicle exhaust. There were moderate negative correlations with wind speed (all species) and humidity (GOM and PBM). Backward air mass trajectory modeling for the ten highest peaks for each mercury species revealed that the majority of these events occurred from air masses that passed through the northern continental US region. Overall, this study illustrates the complexity of temporal fluctuations of airborne mercury species, even in a small town environment.
2011 年 7 月至 2012 年 6 月，在密西西比大学的校园内测量了气态元素汞（GEM）、气态氧化汞（GOM）和颗粒结合态汞（PBM）的浓度。这被认为是首次在密西西比州北部记录大气汞物种的浓度，也是在人口急剧波动的地区进行的记录。GEM 的平均浓度（±1SD）为 1.54±0.32ng/m3；与夏季（1.56±0.32）和秋季（1.63±0.42）相比，冬季（1.48±0.22）和春季（1.46±0.27）的水平较低且通常更为稳定。GOM 和 PBM 的平均浓度分别为 3.87pg/m3和 4.58pg/m3；其水平通常在下午最高，清晨最低。在秋季和春季的学期中，GOM 和 PBM 的浓度和可变性都增加了，可能是由于车辆尾气排放所致。所有物种的浓度与风速呈中度负相关，与湿度呈中度负相关（GOM 和 PBM）。对每种汞物种的十个最高峰值的后向气团轨迹建模表明，这些事件中的大多数都发生在经过北美北部地区的气团中。总体而言，这项研究说明了即使在小镇环境中，空气传播汞物种的时间波动也非常复杂。
