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Characteristic study of ionic species in nano, ultrafine, fine and coarse particle size mode at a traffic sampling site

Air Toxic and Environmental Analysis Laboratory, Hungkuang University, Sha-Lu, Taichung 433, Taiwan, gcfang{at}sunrise.hk.edu.tw

Yuh-Shen Wu

Air Toxic and Environmental Analysis Laboratory, Hungkuang University, Sha-Lu, Taichung 433, Taiwan

Shih-Yo Chang

Research Center for Environmental Changes, Academia Sinica, Nan-Kang Taipei 115, Taiwan

Jui-Yeh Rau

Air Toxic and Environmental Analysis Laboratory, Hungkuang University, Sha-Lu, Taichung 433, Taiwan

Shih-Han Huang

Air Toxic and Environmental Analysis Laboratory, Hungkuang University, Sha-Lu, Taichung 433, Taiwan

Chi-Kwong Lin

Air Toxic and Environmental Analysis Laboratory, Hungkuang University, Sha-Lu, Taichung 433, Taiwan

A micro-orifice uniform deposit impactor (MOUDI) and a nano-MOUDI were used to measure the atmospheric coarse (PM_2.5-10), fine (PM_2.5), ultrafine (PM_{0.056 - 1}) and nano (< 0.056 µm) particle concentrations at a traffic sampling site in central Taiwan during the winter period from November 2004 to January 2005. Meanwhile, concentrations of major ionic species (Cl^-, NO₃^–, SO₄^2–, NH₄⁺, Na⁺, K⁺, Ca²⁺ and Mg²⁺) were also extracted from various particle size modes (nano, ultrafine, fine and coarse) and analysed by ion chromatography (DIONEX-100). The mass size distribution of ambient suspended particles exhibited two modes. The size ranges of the particles at these two particle size modes were between 1.0 and 1.8 mm and 3.2 and 5.6 mm, respectively. The average mass media aerodynamic diameter (MMAD) of suspended particles was 0.99 mm in this study. In addition, statistical methods, such as correlation coefficient and principal component analysis, were also used to identify the possible pollutant source for various particles size modes (nano, ultrafine, fine and coarse) during the winter months at a traffic sampling site in central Taiwan

Key Words: ionic species • nano-MOUDI • nano-particles • size distribution

Toxicology and Industrial Health, Vol. 22, No. 1, 27-37 (2006)
DOI: 10.1191/0748233706th241oa


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