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The primary objective of this study was to measure the mass concentration and chemical compositions of ambient aerosols in the Meliao area, where the construction of a petrochemical complex was underway. The results could be used as the background data for evaluating the nature and health effects of particulate air pollutants from the petrochemical complex in the future. Samples of ambient aerosols at Meliao, Taihsi, and Dacheng were obtained by cascade impactors and dichotomous samplers from November 1992 to January 1994. Samples were analyzed for 20 elements by an X-ray fluorescence (XRF) spectrometer. In addition, concentrations of elemental carbon (EC) and organic carbon (OC) in the samples were determined by an elemental analyzer. The mass concentration of ambient aerosols in the Meliao area was found to be mainly in the range of 10-50μg/m^3 in the fine fraction (aerodynamic diameter ＜ 2.5 μm) and mainly in the range of 15-45μg/m^3 in the coarse fraction (2.5 ＜aerodynamic diameter ＜ 10μm). According to the results of the XRF analysis, the abundant elements in the fine fraction were S, Cl, K, Si, Zn, Ca and Fe and those in the coarse fraction were Si, Cl, Al, Fe, Ca, K and S. The mass concentrations of EC and OC varied markedly with sampling dates and sites. The mass concentration of EC varied from under the detection limit to 10.7μg/m^3 in the fine fraction and from under the detection limit to 3.29μg/m^3 in the coarse fraction. The mass concentration of OC was in the range of 0.01-10.5μg/m^3 in the fine fraction and in the range of 0.17-6.76μg/m^3 in the coarse fraction.

懸浮微粒 ； 化學組成 ； X射線螢光分析儀

ambient aerosols, chemical compositions, XRF analysis