OPEN ACCESS

Articles online

A Nanoparticle Sampler Incorporating Differential Mobility Analyzers and Its Application at a Road-Side near Heavy Traffic in Kawasaki, Japan

Category: Articles

Volume: 9 | Issue: 2 | Pages: 290-304
DOI: 10.4209/aaqr.2008.10.0044
PDF | RIS | BibTeX

Mariko Ono-Ogasawara1, Toshihiko MYOJO 2, Shinji Kobayashi3

  • 1 National Institute of Occupational Safety and Health, Nagao, Tama, Kawasaki, 214-8585, Japan
  • 2 University of Occupational and Environmental Health, Iseigaoka 1-1, Yahata-nishiku, Kita-Kyushu, 807-8555, Japan
  • 3 National Institute for Environmental Studies, Onogawa, Tsukuba, 305-8506, Japan

Abstract

Diesel exhaust particles consist mainly of nanoparticles, the surfaces of which are covered with various organic chemicals such as polycyclic aromatic hydrocarbons (PAHs), some of which are known to be mutagenic or carcinogenic. Because some of these chemicals are volatile or semi-volatile, the fact that a differential mobility analyzer (DMA) operates at normal ambient pressure represents an advantage over many impactor-type samplers, which operate at half atmospheric pressure or less. In this study, we used twin custom-made DMAs as a nanoparticle sampler, and increased the sampling flow rate for each DMA separately. The sampler was used to sample ambient aerosol particulate matter (PM) at the side of a road carrying heavy traffic over a 4-day period. The average sizes of the aerosol particles collected were 80 and 240 nm. The PAHs on these particles were collected on quartz fiber filters and measured by direct-injection thermal-desorption gas chromatography/mass spectrometry. Twelve PAHs (3- to 6-ring PAHs), including benzo(a)pyrene, were analyzed quantitatively. The nanoparticles collected by the DMA sampler were richer in 5- to 6-ring PAHs than PM2.5 particles sampled in parallel. Scanning electron microscopy of the nanoparticles deposited on the DMA electrodes showed that the 240-nm particles (as classified by the DMA) were agglomerates of soot particles with a unit size of around 50nm or less, whereas the 80-nm particles consisted of single nanoparticles or agglomerates of a few particles.

Keywords

Differential mobility analyzer Diesel exhaust particles Nanoparticle Carbon Polycyclic aromatic hydrocarbons Aerosol sampler


Related Article

Characteristics of Exhaust Emissions of a Diesel Generator Fueled with Water-Containing Butanol and Waste-Edible-Oil-Biodiesel Blends

Jen-Hsiung Tsai, Shui-Jen Chen , Kuo-Lin Huang, Wen-Yinn Lin, Chih-Chung Lin, Jyun-Yuan Ding, Cheng-Hsien Yang, Juei-Yu Chiu, Chuen-Huey Chiu
Volume: 15 | Issue: 5 | Pages: 2129-213*
DOI: 10.4209/aaqr.2015.07.0482
PDF

Traffic Particles in Ambient Air of a Major US Urban Area: Has Anything Changed over a Decade?

Sergey A. Grinshpun , Mikhail Yermakov, Tiina Reponen, Mark Simmons, Grace K. LeMasters, Patrick H. Ryan
Volume: 14 | Issue: 5 | Pages: 1344-1351
DOI: 10.4209/aaqr.2013.11.0334
PDF

Critical Emissions from the Largest On-Road Transport Network in South Asia

Saroj Kumar Sahu , Gufran Beig, Neha Parkhi
Volume: 14 | Issue: 1 | Pages: 135-144
DOI: 10.4209/aaqr.2013.04.0137
PDF

Ambient Air Quality during Diwali Festival over Kolkata – A Mega-City in India

A. Chatterjee , C. Sarkar, A. Adak, U. Mukherjee, S.K. Ghosh, S. Raha
Volume: 13 | Issue: 3 | Pages: 1133-1144
DOI: 10.4209/aaqr.2012.03.0062
PDF
;