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Carbonaceous and ionic components in ultrafine and fine particles at four sampling sites in the vicinity of roadway intersection

机译：巷道交叉口附近四个采样点的超细和细颗粒中的碳和离子成分

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摘要

Ultrafine particles (UFPs; Dp < 0.1 μm) and fine particles (FPs; Dp < 2.5 μm) were simultaneously collected for 11 h periods in the daytime and in the nighttime at four sites (S1-S4) around a roadway intersection in an urban area. Sampling was carried out for 14 consecutive days to determine the effect of the intersection on the chemical composition of atmospheric UFPs and FPs. The relative contributions of organic carbon (OC) and elemental carbon (EC) to total carbon (TC) in the daytime samples were 65-86% (UFPs: 83-86%; FPs: 65-75%) and 14-35% (UFPs: 14-17%; FPs: 25-35%), respectively, whereas those in the nighttime samples accounted for 71-90% (UFPs: 87-90%; FPs: 71-78%) and 10-29% (UFPs: 10-13%, FPs: 22-29%), respectively, indicating that the contribution of EC in both UFPs and FPs was higher during the daytime. The decrease in the concentration of carbonaceous components with distance from the intersection indicated a strong effect of motor vehicles emissions on the composition of UFPs and FPs around the intersection. The diurnal variations of sulfate and nitrate in UFPs are consistent with the seasonal variations of sulfate and nitrate in FPs showing higher sulfate and nitrate concentrations in summer and winter, respectively. Not observed in FPs, the diurnal patterns of sulfate and nitrate in UFPs may be closely related to particle size in comparison with larger particles, because smaller particles are more strongly affected by the surrounding environment, for example, through oxidation and dissociation. The present study provides interesting observation that the emission characteristics of OC and EC fractions can be different in the same roadside environment depending on the distance from roadway intersection and particle sizes. Furthermore, concentration difference between EC and black carbon (BC) was found at specific site indicating different EC emission characteristics at the same roadside environment.
机译：在城市中道路交叉口周围的四个站点（S1-S4）的白天和夜间，在11小时内同时收集了超细颗粒（UFPs; Dp <0.1μm）和细颗粒（FPs; Dp <2.5μm）区域。连续进行了14天的采样，以确定交叉点对大气UFP和FP的化学成分的影响。白天样品中有机碳（OC）和元素碳（EC）对总碳（TC）的相对贡献为65-86％（UFP：83-86％； FP：65-75％）和14-35％ （UFPs：14-17％； FPs：25-35％），而夜间样本中的样本分别占71-90％（UFPs：87-90％； FPs：71-78％）和10-29％ （UFPs：10-13％，FPs：22-29％），这表明EC在白天和白天在UFP和FPs中的贡献都较高。碳质组分的浓度随着距交叉路口的距离的减小而降低，表明机动车排放对交叉路口周围UFP和FP的组成产生了强烈影响。 UFPs中硫酸盐和硝酸盐的日变化与FPs中硫酸盐和硝酸盐的季节变化一致，分别在夏季和冬季分别显示较高的硫酸盐和硝酸盐浓度。在FPs中未观察到，与较大的颗粒相比，UFP中的硫酸盐和硝酸盐的昼夜模式可能与颗粒大小密切相关，因为较小的颗粒受周围环境的影响更大，例如通过氧化和离解。本研究提供了有趣的观察结果，即在相同路旁环境中，取决于与道路交叉口的距离和粒径，OC和EC馏分的排放特性可能会有所不同。此外，在特定地点发现了EC和黑碳（BC）之间的浓度差异，表明在相同路边环境中EC排放特征不同。

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  • 来源
    《Atmospheric environment》 |2013年第8期|83-92|共10页
  • 作者

    Kyung Hwan Kim; Kazuhiko Sekiguchi; Shinji Kudo; Masatoshi Kinoshita; Kazuhiko Sakamoto;

  • 作者单位

    Graduate School of Science and Engineering, Saitama University, 255 Shimo-Okubo, Sakura, Saitama 338-8570, Japan,Center for Environment, Health and Welfare Research, Korea Institute of Science and Technology, Hwarangno 14-gil 5 Seongbuk-gu, Seoul 136-791,Republic of Korea;

    Graduate School of Science and Engineering, Saitama University, 255 Shimo-Okubo, Sakura, Saitama 338-8570, Japan,Institute for Environmental Science and Technology, Saitama University, 255 Shimo-Okubo, Sakura, Saitama 338-8570, Japan;

    Graduate School of Science and Engineering, Saitama University, 255 Shimo-Okubo, Sakura, Saitama 338-8570, Japan;

    Graduate School of Science and Engineering, Saitama University, 255 Shimo-Okubo, Sakura, Saitama 338-8570, Japan;

    Institute for Environmental Science and Technology, Saitama University, 255 Shimo-Okubo, Sakura, Saitama 338-8570, Japan,Center for Environmental Science in Saitama, 914 Kami-tanadare, Kazo, Saitama 347-0115, Japan;

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  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    Roadside; Ultrafine particle; Chemical composition; Intersection; Black carbon;

    机译：路边;超细颗粒;化学成分;路口;黑炭;

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