| A 12-month study of the concentration of inhalable particulates (PM10) and 30 polycyclicaromatic hydrocarbons (PAHs)--typical semi-volatile organic compounds (SVOCs) wascarried out in six national air auto-monitoring sites of Nanjing city. The collected samples were extracted by supersonic extraction, concentrated by Kuderna-Danish concentrator and blew with high purity nitrogen in sequence. Gas chromatography-mass spectrometry with selected ion storage option (GC-MS-SIS) was used to analysis the pretreated samples. Seasonal variations in both PM10 and PAHs were observed in the study with higher concentration during winter, spring and lower concentration during autumn, summer. A number of factors have been discussed which could be contributing to seasonal variation in pollutant levels. Based on the determined data at various sampling sites, the main sources of SVOCs on airborne particulates in Nanjing city were estimated by ratios method and factor analysis method. The tracers of various pollution sources were determined by factor analysis method. Lastly the percentage contributions of various pollution sources to SVOCs on airborne particulates in Nanjing city were calculated using multiple regress models. The main pollution sources are coal combustion, traffic emission, the residue of oil or mineral combustion and burning emission which accounts for 44.0%, 31.0% 19.9% and 4.7% of SVOCs, respectively.
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