Water-soluble ions in nano/ultrafine/fine/coarse particles collected near a busy road and at a rural site
- 作者：Chih-Chung Lin ; Shui-Jen Chen ; Kuo-Lin Huang ; Wen-Jhy Lee ; Wen-Yinn Lin ; Chiu-Jung Liao ; Hso-Chi Chaung ; Chuen-Huey Chiu
- 关键词：Traffic-associated particles ; Nanoparticles ; Ultrafine ; Water-soluble ions ; Size distributions
- 刊名：Environmental Pollution
- 出版年：2007
- 期刊代码：28_02697491
- 类别：env
- 出版时间：January 2007
- 卷：145
- 期：2
- 页码：562-570
- 文件大小：418 K
摘要
This study investigated water-soluble ions in the sized particles (particularly nano (PM<sub>0.01–0.056sub>)/ultrafine (PM<sub>0.01–0.1sub>)) collected using MOUDI and Nano-MOUDI samplers near a busy road site and at a rural site. The analytical results demonstrate that nano and coarse particles exhibited the highest (16.3%) and lowest (8.37%) nitrate mass ratios, respectively. The mass ratio of NO<sub>3sub><sup>−sup> was higher than that of SO<sub>4sub><sup>2−sup> in all the sized particles at the traffic site.
The secondary aerosols all displayed trimodal distributions. The aerosols in ultrafine particles collected at the roadside site exhibited Aitken mode distributions indicating they were of local origin. This finding was not observed for those ultrafine particles collected at the rural site. The mass median diameters (MMDs) of the nano, ultrafine, and fine particles were smaller at the traffic site than at the rural site, possibly related to the contribution of mobile engine emissions.