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Ambient air particulate dry deposition, concentrations and ionic species study at Taichung Harbor near Taiwan Strait

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

Guor-Cheng Fang

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

Jhy-Cherng Chen

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

The characterization for watersoluble species of dry deposition flux, total suspended particulate (TSP), fine particle (particle matter with aerodynamical diameter 2.5 mm, PM_2.5), coarse particle (particle matter with aerodynamical diameter 2.5-10 mm, PM_2.5 10), and dry deposition velocity were studied at Taichung Harbor sampling sites of central Taiwan during February-August 2004. The average downward dry deposition flux, TSP, PM₁₀ concentrations obtained in Taichung Harbor were about 0.51, 0.3, and 3.4 times more than those values obtained by traffic sampling site in central Taiwan. Average dry deposition velocity for mass, Cl, NO₃, SO₄², Na, NH₄, Mg², and Ca²were 9, 3.8, 0.3, 0.25, 0.46, 0.18, 0.51 and 2.28 cm respectively at the harbor sampling site. In general, average particle mass dry deposition velocity was about 1.8 times more than those values obtained at the traffic sampling site. Chemical analysis, also indicated that three major soluble inorganic species concentrations (sulfate-nitrate-ammonium) accounted for 59.8% and 80.6% of the PM_2.5 and PM_2.5 10 mass concentrations, respectively at the Taichung Harbor sampling site.

Key Words: dry deposition flux • PM2.5 and PM2.5 10 Harbor • TSP • watersoluble species

Toxicology and Industrial Health, Vol. 21, No. 5-6, 177-187 (2005)
DOI: 10.1191/0748233705th226oa


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