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Chemical Characteristics, Spatiotemporal Distribution, and Source Apportionment of PM2.5 Surrounding Industrial Complexes in Southern Kaohsiung

Category: Aerosol and Atmospheric Chemistry

Volume: 20 | Issue: 3 | Pages: 557-575
DOI: 10.4209/aaqr.2020.01.0007
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To cite this article:
She, H., Cheng, P.H., Yuan, C.S., Yang, Z.M., Hung, C.M., Yen, P.H. and Ie, I.R. (2020). Chemical Characteristics, Spatiotemporal Distribution, and Source Apportionment of PM2.5 Surrounding Industrial Complexes in Southern Kaohsiung. Aerosol Air Qual. Res. 20: 557-575. doi: 10.4209/aaqr.2020.01.0007.

Huazhen She1,2, Po-Hung Cheng2, Chung-Shin Yuan 2, Zong-Mou Yang2, Chung-Min Hung2, Po-Hsuan Yen2, Iau-Ren Ie2

  • 1 College of Chemical Engineering, HuaQiao University, Xiamen 361021, China
  • 2 Institute of Environmental Engineering, National Sun-Yat Sen University, Kaohsiung 80424, Taiwan

Highlights

  • Daytime PM2.5 level was commonly higher than nighttime in Linhai industrial area.
  • Secondary inorganic aerosols dominated PM2.5 in winter and spring in the area.
  • OC dominated carbonaceous contents and high SOC occurred in winter and spring.
  • The major sources of PM2.5 in the area were iron works, secondary aerosols, etc.

Abstract

This study investigated PM2.5, specifically, its chemical characteristics and spatiotemporal variation, and identified its potential sources in the Linhai industrial complex of southern Kaohsiung. Seasonal 12-h PM2.5 samples were collected simultaneously at three sampling sites. The results showed that high PM2.5 concentrations mainly occurred during winter and spring, with concentrations at the downwind sites always exceeding those at the upwind sites due to the transport of secondary aerosol by the prevailing winds. 31.4–56.8% of the PM2.5 consisted of water-soluble ions (WSIs), which were dominated by secondary inorganic aerosol (SIA) (SO42– + NO3 + NH4+). High mass ratios between the SIA and the PM2.5 (SIA/PM2.5) were also observed during winter and spring, suggesting that SIA was the primary contributor to the high levels of PM2.5. A neutralization ratio (NR) < 1 indicated that the PM2.5 was acidic, and a nitrogen oxidation ratio (NOR) > 0.1 and a sulfur oxidation ratio (SOR) > 0.25 showed that SIA frequently formed during winter and spring. The metallic elements, which accounted for 12.0–20.2% of the PM2.5, tended to exhibit higher concentrations during daytime than nighttime, and the enrichment factors (EFs) revealed that the trace metals (Ni, Cr, Cu, and Zn) were mainly anthropogenic in origin. Carbonaceous content formed 9.3–24.3% of the PM2.5, and high mass ratios between the organic and the elemental carbon (OC/EC) were also observed during winter and spring. Moreover, the mass ratios between the malonic and the succinic acid (M/S) were always > 1.0 during winter and spring and < 1.0 during summer and fall, demonstrating that organic acids dominated the SOA during the first two seasons. The major sources of PM2.5 in the Linhai industrial complex were steel plants, followed by secondary sulfate and nitrate, vehicular exhaust, petrochemical plants, and incinerators.

Keywords

Industrial complex Fine particles (PM2.5) Spatiotemporal variation Chemical characteristics Source apportionment


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