| Summary: | 碩士 === 國立中興大學 === 環境工程學系 === 87 === Abstract
The purpose of this study was to understand the characteristics and the sources of PM10 (particulate matter with aerodynamic diameter equal to or less than 10 mm) in Taichung harbor area. PM10 samples were collected at Chinzui and Homei sites from September 1998 to January 1999. Three intensive samplings were conducted in this work. The collected samples were analyzed for water soluble ions, elemental carbon (EC), organic carbon (OC), and metallic constituents.
The results showed that the wind direction during sampling period were mostly from the north or the northeast by north. The average PM10 mass concentration at Chinzui and Homei were 54.8 and 69.5 mg/m3, respectively. The most abundant species in PM10 were EC, OC, SO42-, NH4+, Si, NO3-, Na+, Cl-. The sources which contributed to PM10 were from combustion emission, secondary aerosols, geological material, and from marine spray. The values of Sulphur oxidation ratio (S.O.R.) at Chinzui and Homei were 0.35 and 0.19, respectively while the Nitrogen oxidation ratio (N.O.R.) were 0.16 and 0.10. The corresponding values of Neutralisation ratio (N.R.) at these two stations were 1.33 and 1.40, respectively.
Enrichment factor analyses indicated that the anthropogenic aerosols in this area are from construction activity, from fuel burning, and from agricultural burning. The VARIMAX-rotated principal component analyses identified five major components accounting for approximately 90 % of the total variance. The identified sources were geological material, secondary aerosols, motor vehicle exhaust, fuel burning, and marine spray.
The result of Chemical Mass Balance (CMB) receptor model showed that the sources contribution to PM10 at Chinzui and Homei were 15.5 and 27.9 % from geological material, 26.2 and 29.2 % from vehicle exhaust, 17.1 and 13.7 % from agricultural burning, 11.2 and 12.3 % from ammonium sulfate, 7.7 and 6.2 % from marine spray, 2.9 and 2.5 % from ammonium nitrate, 1.7 and 1.0 % from coal-fired power plant, 0.8 and 1.2 % from heavy oil burning, and 0.2 % and 0.3 % from steel plant, respectively. The source apportionment of Chinzui and Homei aerosols were approximately same except geological martial.
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