Study On The Morphology And Source Apportionment Of PAHs On Inhalable Particles In Typical Areas In Nanjing

Two places were selected including dachang and shanxilu as inspected spots in Nanjing. One year samples of inhalable particles(PM₁₀) in ambient air were gathered month by month , by using big flux sampling equipment and PM₁₀ incision equipment. Scanning Electron Microscope and X-ray energy dispersive spectrometer were used to analyze of the morphology and chemical composition of inhalable particles, which confirms that the inhalable particles in Nanjing is mainly classified as soot aggregates, coal-burnning ash and mineral particulates; and the conclusion shows that mineral particulates has complex compositions including potash feldspar, plagioclase and quartz. The samples of four sources were collected, such as coal combustion, coke plant, motor vehicle and dining hall. Both source and receptor samples were pretreatment: extracted by soxhelt extraction, concentrated by Kuderna-Danish concentrator, separated by column chromatography and blew with purity nitrogen in sequence. High Performance Liquid Chromatography(HPLC) was used to analyze the sixteen PAHs in pretreated samples. Based on the determined data at various sampling sites, the main sources of PAHs on inhalable particles in nanjing city were estimated by Chemical Mass Balance (CMB) receptor models, the PAHs fingerprints of coal combustion, coke plant, motor vehicle and dining hall were obtained, which accounts for 10.43%, 59.93%, 28.95% and 0.69% in dachang and accounts for 29.24%, 25.42%, 29.48% and 15.86% in shanxi street, respectively.