Irei Satoshi, Stupak Jacek, Gong Xueping, Chan Tak-Wai, Cox Michelle, McLaren Robert, Rudolph Jochen
Centre for Atmospheric Chemistry and Department of Chemistry, York University, 4700 Keele St., Toronto, ON, Canada M3J 1P3.
Climate Chemistry Measurements and Research, Climate Research Division, Environment and Climate Change Canada, 4905 Dufferin Street, Toronto, ON, Canada M3H 5T4.
J Anal Methods Chem. 2017;2017:3504274. doi: 10.1155/2017/3504274. Epub 2017 Sep 17.
To study the origins of airborne particulate organic matter in southern Ontario, molecular marker concentrations were studied at Hamilton, Simcoe, and York Gateway Tunnel, representing industrial, rural, and heavy traffic sites, respectively. Airborne particulate matter smaller than 10 m in aerodynamic diameter was collected on quartz filters, and the collected samples were analyzed for total carbons, 5-6 ring PAHs, hopanes, -alkanes (C to C), and oxygenated aromatic compounds. Results showed that PAH concentrations at all three sites were highly correlated, indicating vehicular emissions as the major source. Meanwhile, in the scatter plots of ,-hopane and trisnorhopane, concentrations displayed different trends for Hamilton and Simcoe. The slopes of the linear regressions for Hamilton and the tunnel were statistically the same, while the slope for Simcoe was significantly different from those. Comparison with literature values revealed that the trend observed at Simcoe was explained by the influence from coal combustion. We also found that the majority of oxygenated aromatic compounds at both sites were in the similar level, possibly implying secondary products contained in the southern Ontario air. Regardless of some discrepancies, absolute principal component analysis applied to the datasets could reproduce those findings.
为研究安大略省南部空气中颗粒有机物的来源，分别在代表工业、农村和交通繁忙地点的汉密尔顿、锡姆科和约克门隧道对分子标志物浓度进行了研究。在石英滤膜上收集空气动力学直径小于10微米的空气颗粒物，对收集的样品分析总碳、5至6环多环芳烃、藿烷、正构烷烃（C至C）和氧化芳香化合物。结果表明，所有三个地点的多环芳烃浓度高度相关，表明车辆排放是主要来源。同时，在藿烷和三降藿烷的散点图中，汉密尔顿和锡姆科的浓度呈现不同趋势。汉密尔顿和隧道的线性回归斜率在统计学上相同，而锡姆科的斜率与它们显著不同。与文献值比较表明，锡姆科观察到的趋势可由煤炭燃烧的影响来解释。我们还发现，两个地点的大多数氧化芳香化合物处于相似水平，这可能意味着安大略省南部空气中含有二次产物。尽管存在一些差异，但对数据集应用绝对主成分分析能够重现这些发现。
