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首页> 外文期刊>Environmental Science & Technology >Evidence for Different Reactive Hg Sources and Chemical Compounds at Adjacent Valley and High Elevation Locations
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Evidence for Different Reactive Hg Sources and Chemical Compounds at Adjacent Valley and High Elevation Locations

机译：邻近山谷和高海拔地区不同反应性汞源和化合物的证据

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摘要

The spatial distribution of chemical compounds and concentration of reactive mercury (RM), defined as the sum of gaseous oxidized mercury (GOM) and <3 μm particulate bound mercury (PBM), are poorly characterized. The objective of this study was to understand the chemistry, concentration, and spatial and temporal distribution of GOM at adjacent locations (12 km apart) with a difference in elevation of ~1000 m. Atmospheric GOM measurements were made with passive and active samplers using membranes, and at one location, a Tekran mercury measurement system was used. The chemistry of GOM varied across time and location. On the basis of data collected, chemistry at the low elevation site adjacent to a highway was primarily influenced by pollutants generated by mobile sources (GOM = nitrogen and sulfur-based compounds), and the high elevation site (GOM = halogen-based compounds) was affected by long-range transport in the free troposphere over the marine boundary layer into Nevada. Data collected at these two locations demonstrate that different GOM compounds exist depending on the oxidants present in the air. Measurements of GOM made by the KCI denuder in the Tekran instrument located at the low elevation site were lower than that measured using membranes by 1.7-13 times. Accurate measurements of atmospheric concentrations and chemistry of RM are necessary for proper assessment of environmental impacts, and field measurements are essential for atmospheric models, which in turn influence policy decisions.
机译：化合物的空间分布和反应性汞（RM）的浓度（定义为气态氧化汞（GOM）和小于3μm颗粒结合汞（PBM）的总和）的特征较差。这项研究的目的是了解GOM的化学成分，浓度以及时空分布在相邻位置（相距12 km），且高程差约为1000 m。使用被动和主动采样器通过膜进行大气GOM测量，并在一个位置使用Tekran汞测量系统。 GOM的化学性质随时间和位置而变化。根据收集的数据，邻近高速公路的低海拔站点的化学物质主要受到移动源（GOM =氮和硫基化合物）和高海拔站点（GOM =卤素基化合物）产生的污染物的影响受到自由对流层中越过海洋边界层进入内华达州的影响。在这两个位置收集的数据表明，取决于空气中存在的氧化剂，存在不同的GOM化合物。由KCI剥蚀仪在低海拔位置的Tekran仪器中进行的GOM测量比使用膜进行的测量低1.7-13倍。要正确评估环境影响，必须对大气浓度和RM的化学成分进行准确的测量，而对于大气模型则必须进行现场测量，这反过来会影响政策决策。

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  • 来源
    《Environmental Science & Technology》 |2016年第22期|12225-12231|共7页
  • 作者

    Mae Sexauer Gustin; Ashley M. Pierce; Jiaoyan Huang; Matthieu B. Miller; Heather A. Holmes; S. Marcela Loria-Salazar;

  • 作者单位

    Department of Natural Resources and Environmental Science Department of Physics University of Nevada-Reno, Reno, Nevada 89557, United States;

    Department of Natural Resources and Environmental Science Department of Physics University of Nevada-Reno, Reno, Nevada 89557, United States;

    Department of Natural Resources and Environmental Science Department of Physics University of Nevada-Reno, Reno, Nevada 89557, United States;

    Department of Natural Resources and Environmental Science Department of Physics University of Nevada-Reno, Reno, Nevada 89557, United States;

    Atmospheric Sciences Program, Department of Physics University of Nevada-Reno, Reno, Nevada 89557, United States;

    Atmospheric Sciences Program, Department of Physics University of Nevada-Reno, Reno, Nevada 89557, United States;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
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