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《Environmental Chemistry》 2009-02
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HAN Yue-mei1,2SHEN Zhen-xing1,2CAO Jun-ji2,3LI Xu-xiang2ZHAO Jin-lian1,2 LIU Ping-ping1,2WANG Yun-hai1,2ZHOU Juan1,2(1State Key Laboratory of Multiphase Flow in Power Engineering,Xi'an Jiaotong University,Xi'an,710049,China;2Department of Environmental Science and Engineering,Xi'an Jiaotong University,Xi'an,710049,China;3State Key Laboratory of Loess and Quaternary Geology,Institute of Earth Environment,Chinese Academy of Sciences,Xi'an,710075,China)  
PM2.5 and TSP samples were simultaneously collected from October 2006 to October 2007 in Xi'an,and to investigate seasonal variations of water-soluble inorganic ions(Na+,NH+4,K+,Mg2+,Ca2+,F-,Cl-,Br-,NO-2,NO-3 and SO2-4) and their characteristics of typical pollution episodes(haze,dust,straw combustion,and fireworks).The result showed that the mean value of PM2.5 and TSP mass concentration were 167.1 μg·m-3 and 382.0 μg·m-3.PM2.5 occupied 44% of TSP mass.The annual mean mass concentration for total water-soluble ions in PM2.5 and TSP were 75.2μg·m-3 and 101.7μg·m-3,respectively,which occupied nearly 45% of PM2.5 mass and nearly 30% of TSP mass.The size distribution and seasonal variation of water-soluble ions were diverse when considering different sources and formation mechanism.Characteristics of aerosol particles and ionic species in typical pollution episodes were disparity than ordinary days.In haze days,the mass concentration of PM2.5 and TSP increased significantly compared to normal days,and major ions were secondary species such as NH+4,NO-3,and SO2-4.In floating dusty days,anthropogenic components were greatly reduced while the concentration of Na+,Mg2+,and Ca2+,which represent fugitive dust,increased fast.Straw combustion had a remarkable influence on K+ and Cl-in particulate matter.Fireworks brought more K+,Mg2+ and Ca2+.
【Fund】: 国家自然科学基金项目(40675081和40599420);; 陕西省自然科学基金项目(2005D08)资助
【CateGory Index】: X513
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