• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Aerosol and Air Quality Research >Carbonaceous Components in PM2.5 and PM0.1 with Online Measurements of Gaseous and Particulate Pollutants: Implication of Thermal-Optical Derived EC2 Fraction as a Component of Ultrafine Particles in the Roadside Environment
【24h】

Carbonaceous Components in PM2.5 and PM0.1 with Online Measurements of Gaseous and Particulate Pollutants: Implication of Thermal-Optical Derived EC2 Fraction as a Component of Ultrafine Particles in the Roadside Environment

机译：在线测量气态和微粒污染物的PM2.5和PM0.1中的碳质组分：热光学衍生EC2馏分作为路边环境中超细颗粒的组分的含义

获取原文
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

An investigation of the carbonaceous components of PM2.5 (Dp < 2.5 μm) and PM0.1 (Dp < 0.1 μm) in conjunction with online measurements of gaseous and particulate pollutants, which are dominated by motor vehicle emissions, was undertaken over 15 consecutive days in a field sampling campaign at a roadside and reference site for daytime (06:00 to 17:30) and nighttime (18:00 to 05:30) conditions. The results indicated that traffic-related air pollutants strongly influenced pollution levels in the sampling area, especially during the nighttime, although the concentrations were lower than during the daytime. Water-soluble organic carbon/organic carbon (WSOC/OC) ratios in PM0.1 were 0.60 ± 0.11 and 0.63 ± 0.16 at the roadside and reference sites, respectively, while the corresponding ratios in PM2.5 were found to be 0.60 ± 0.11 and 0.63 ± 0.14. These results demonstrated the relatively high contribution of WSOC in the study area compared to in previous reports. It was observed that elemental carbon (EC) in PM0.1 are emitted approximately by a factor of 0.1 in comparison with those observed for EC in PM2.5 when considering the slopes of the linear relationship with particle-bound PAHs and NOx, while OC displayed no such relationship. Our measurements indicate that a significant portion of the OC in PM0.1 is not directly co-emitted with EC from motor vehicles but is readily adsorbed or condensed onto the existing EC fractions through condensation. The relationship between the EC2 fraction and the particle number concentration indicates that the EC2 fraction is the primary chemical component of traffic related ultrafine particles in terms of particle number concentration.
机译：连续15个月对PM2.5（Dp <2.5μm）和PM0.1（Dp <0.1μm）的碳质成分进行了调查，并在线测量了以机动车排放为主的气态和颗粒污染物。白天（06:00到17:30）和夜间（18:00到05:30）情况下在路边和参考站点进行的野外采样活动中的天数。结果表明，与交通有关的空气污染物对采样区的污染水平有很大影响，特别是在夜间，尽管其浓度低于白天。在路边和参考地点，PM0.1中的水溶性有机碳/有机碳（WSOC / OC）比分别为0.60±0.11和0.63±0.16，而PM2.5中的相应比例为0.60±0.11和0.63±0.14。这些结果表明，与以前的报告相比，WSOC在研究领域的贡献相对较高。当考虑与颗粒结合的PAHs和NOx线性关系的斜率时，观察到与污染物中PM2.5的EC相比，PM0.1中的元素碳（EC）排放量大约降低了0.1倍。没有显示这种关系。我们的测量表明，PM0.1中的大部分OC不是直接与机动车的EC共同排放，而是很容易通过冷凝作用吸附或冷凝到现有EC馏分上。 EC 2分数与颗粒数浓度之间的关系表明，就颗粒数浓度而言，EC 2分数是交通相关超细颗粒的主要化学成分。

著录项

相似文献

  • 外文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号