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首页> 外文期刊>Environmental Science & Technology >Source apportionment of molecular markers and organic aerosols-1. Polycyclic aromatic hydrocarbons and methodology for data visualization
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Source apportionment of molecular markers and organic aerosols-1. Polycyclic aromatic hydrocarbons and methodology for data visualization

机译：分子标记物和有机气溶胶的来源分配-1。多环芳烃及其数据可视化方法

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Individual organic compounds often referred to as molecular markers are used in conjunction with the chemical mass balance (CMB) model to apportion sources of primary organic aerosol. This paper presents a methodology to visualize molecular marker data; it allows comparison of ambient data and source profiles and allows assessment of chemical stability and aging. The method is intended to complement traditional quantitative source apportionment analysis. The core of the technique involves construction of plots of ratios of species concentrations (ratio-ratio plots) in which source profiles appear as points connected by linear mixing lines. The approach is illustrated using data collected over a 1-year period in Pittsburgh, Pennsylvania. The analysis considers for elemental carbon and a number of high molecular weight polycyclic aromatic hydrocarbons (PAHs) commonly used as molecular markers in CMB: benzo(b+j+k)fluoranthene, benzo(e) pyrene, benzo[ g, h, i] perylene, coronene, and indeno(1,2,3-cd) pyrene. In Pittsburgh, the ambient concentrations of these PAHs are higher than in other cities in the United States; they are also strongly correlated consistent with a single, dominant source. Both ratio-ratio plots and CMB analysis indicate that this source is metallurgical coke production. Although emissions from coke production dominate ambient PAH concentrations, on most study days they contributed little fine particle mass. Ratio-ratio plots are then used to investigate the feasibility of using PAHs to help differentiate between gasoline and diesel vehicle emissions. Ambient concentrations of these large PAHs provide little information on the gasoline-diesel split because of the strong influence of local emissions from coke production combined with evidence of photochemical decay of PAHs in the regional air mass. Decay of PAHs will bias estimates of the gasoline-diesel split toward diesel emissions.
机译：通常将称为分子标记的单个有机化合物与化学质量平衡（CMB）模型结合使用，以分配主要有机气溶胶的来源。本文提出了一种可视化分子标记数据的方法。它可以比较环境数据和来源概况，并可以评估化学稳定性和老化。该方法旨在补充传统的定量来源分配分析。该技术的核心涉及构建物种浓度比图（比例图），其中源剖面显示为通过线性混合线连接的点。使用宾夕法尼亚州匹兹堡1年期间收集的数据说明了该方法。该分析考虑了元素碳和许多通常用作CMB分子标记的高分子量多环芳烃（PAH）：苯并（b + j + k）荧蒽，苯并（e）,、苯并[g，h，i per，co和茚并（1,2,3-cd）pyr。在匹兹堡，这些多环芳烃的环境浓度高于美国其他城市。它们也与单一的显性来源高度相关。比率比图和CMB分析均表明该来源是冶金焦生产。尽管焦炭生产中的排放量占环境PAH浓度的主要部分，但在大多数研究日间，它们贡献的细颗粒质量很小。然后使用比率比率图来研究使用PAH来帮助区分汽油和柴油车辆排放的可行性。这些大型多环芳烃的环境浓度几乎没有提供有关汽油-柴油分离的信息，这是因为焦炭生产对局部排放的强烈影响以及区域空气质量中多环芳烃的光化学衰减的证据。 PAHs的下降将使汽油-柴油分配的估计偏向柴油排放。

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