Institute of Environmental Engineering and Management, National Taipei University of Technology, Taipei, Taiwan.
J Environ Sci Health A Tox Hazard Subst Environ Eng. 2010 Dec;45(14):1839-49. doi: 10.1080/10934529.2010.520505.
This study examines size-resolved particle-bound water-soluble ions and carbons (element carbon (EC) and organic carbon (OC)) collected near a busy road and at an urban site. The traffic-related fine and coarse particles were collected using two manual dichotomous samplers (Dichots) equipped with Quartz filters. The PM(2.5)/PM(2.5-10) value during rush hour (3.57) exceeded that during slack time (2.72). During weekdays and weekends, although the roadside PM(2.5) concentration correlated well with traffic flow (R(2)= 0.91 and 0.81, respectively), the roadside PM(2.5-10) concentration did not. The lowest second aerosol concentrations were observed from 19:00 to 21:00 during weekdays and weekends. The average content of total water-soluble ions in PM(2.5) was 30.7% and 35.7% for weekday and weekend samples, respectively (a total average of 33.2%). In PM(2.5), the content of NO(3)(-) (8.95-11.0%) exceeded that of SO(4)(2-) (7.08-8.10%) at the roadside site. Conversely, the content of PM(2.5)-bound SO(4)(2-) was higher than that of PM(2.5)-bound NO(3)(-) at the urban site. The mean content of PM(2.5)-bound TC was 35.8%, while that of PM(2.5-10)-bound TC was 15.9%. Moreover, the R(2) values of traffic flow versus PM(2.5)-bound EC concentration on weekdays and weekends were 0.89 and 0.56, respectively, and were 0.82 and 0.38, respectively, for those of traffic flow versus PM(2.5)-bound OC concentration.
本研究考察了在繁忙道路附近和城市地区采集的粒径分辨的颗粒结合水溶性离子和碳（元素碳（EC）和有机碳（OC））。使用配备有石英过滤器的两个手动二分采样器（Dichots）收集与交通有关的细颗粒和粗颗粒。高峰时段（3.57）的 PM2.5/PM2.5-10 值大于空闲时间（2.72）的 PM2.5/PM2.5-10 值。在工作日和周末，尽管路边 PM2.5 浓度与交通流量密切相关（分别为 R2=0.91 和 0.81），但路边 PM2.5-10 浓度没有。在工作日和周末，从 19:00 到 21:00 观察到第二气溶胶浓度最低。工作日和周末 PM2.5 中总水溶性离子的平均含量分别为 30.7%和 35.7%（总平均值为 33.2%）。在 PM2.5 中，路边站点的 NO3-（8.95-11.0%）含量超过 SO42-（7.08-8.10%）含量。相反，城市站点的 PM2.5 结合 SO42-含量高于 PM2.5 结合 NO3-含量。PM2.5 结合 TC 的平均含量为 35.8%，而 PM2.5-10 结合 TC 的平均含量为 15.9%。此外，工作日和周末交通流量与 PM2.5 结合 EC 浓度之间的 R2 值分别为 0.89 和 0.56，而交通流量与 PM2.5 结合 OC 浓度之间的 R2 值分别为 0.82 和 0.38。
