Volume 15, No. 7, December 2015, Pages 2571-2583 PDF(1.09 MB)
Characteristics of Concentrations and Metal Compositions for PM2.5 and PM2.5–10 in Yunlin County, Taiwan during Air Quality Deterioration
Yu-Cheng Chen1,2, Chin-Yu Hsu1, Sheng-Lun Lin3, Guo-Ping Chang-Chien3, Mu-Jean Chen1, Guor-Cheng Fang4, Hung-Che Chiang1
1 National Environmental Health Research Center, National Health Research Institutes, 35 Keyan Road, Zhunan Town, Miaoli 35053, Taiwan
2 Department of Occupational Safety and Health, China Medical University, 91 Hsueh-Shih Road, Taichung 40402, Taiwan
3 Super Micro Mass Research and Technology Center, Cheng Shiu University, No. 840, Chengcing Rd., Kaohsiung 83347, Taiwan
4 Department of Safety, Health and Environmental Engineering, Hungkuang University, ShaLu, Taichung 433, Taiwan
- Ambient fine and coarse particles and associated metals are characterized.
- Coal combustion is the major emission source of fine-size metals.
- Soil dust and crustal elements is the major emission source of coarse-size metals.
- PM episode increases 132% and 116% of fine-size Pb and As, respectively.
Concentrations of twenty trace metals in ambient fine and coarse particles were characterized during the period of air quality deterioration of elevated particulate matters (PM episode) in winter in the suburban area, Yunlin County, Taiwan. The potential emission sources of fine- and coarse-size metals were identified using the enrichment factor (EF) analysis, principal component analysis (PCA) and backward trajectory model. The high concentrations of fine and coarse particles and their associated metals were observed during the PM episode in Yunlin County. Al, Fe, and Ca were predominant in fine and coarse particles for sampling periods, accounting for 75–85% of all selected elements. When the PM episode occurred, mean concentrations of fine-size Pb and As were increased to 132% and 116%, respectively, while average concentrations of coarse-size Fe, Al, Mn, Ti, and Co were increased to 1.1–2.2 times, in comparison with non-episode period. The mean value of fine-size As (6.67 ng m–3) obtained from the episode period exceeds the proposed European Union standard (6 ng m–3). EF values were decreased with increasing particle size for Sb, Se, As, Mo, Cr, Cu, V, Pb, Zn, Ni and Cd in both episode periods. Fine-size metals is likely to refer to coal combustion (36.5%), iron and steel industry (30.5%), vehicular emission and oil burning (16.3%), and Cu smelting source (13.1%), while coarse-size metals are associated with soil dust and crustal elements (61.6%), traffic-related re-suspended road dust (19.4%), industrial process (10.6%) and coal/oil combustion (6.3%) for the PM episode.
Trace metals; Episode; Enrichment factor; Source apportionment.