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《Environmental Science & Technology》 2010-01
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Major Inorganic Water-soluble Ions in Fine Particles Collected in Autumn in Urban Guangzhou

LV Wen-ying1,2,XU Hai-juan1,WANG Xin-ming1(1.State Key Laboratory of Organic Geochemistry,Guangzhou Institute of Geochemistry,Chinese Academy of Sciences,Guangzhou 510640,China;2.School of Environmental Science and Engineering,Guangdong University of Technology,Guangzhou 510006,China)  
On a rooftop 50m above ground and at a roadside 1.2m above ground in urban Guangzhou,PM2.5 samples were collected consecutively for a week in autumn of 2006 for comparison of major inorganic water-soluble ions including SO42-,NO3-,Cl-,F-,Na+,NH4+,Ca2+,K+ and Mg2+.Results showed that PM2.5 mass concentrations on the rooftop ranged 59.5~129.5 μg/m3 with an average of 83.7μg/m3,while those at the roadside ranged 108.4~132.2μg/m3 with average of 121.1μg/m3.In average,9 ions/anions had a sum of 50.9μg/m3 and 44.1μg/m3,accounting for 60.8% and 36.4% in total mass of PM2.5 respectively for the rooftop and roadside samples.SO42-and NO3-were major constituents among major water soluble ions,and their shares in PM2.5 were both higher on the rooftop than at the roadside,indicating that contributions from secondary formation were larger on the rooftop where air was well mixed,and that roadside PM2.5 instead had a relatively larger contribution from primary sources.Calculated sea salt contribution to water soluble fraction of PM2.5 was trivial.The equivalent concentrations of NH4+ were less than those of SO42-and NO3-with neutralization ratio much lower than 1.0,indicating high particle acidity,which was higher on the rooftop than at the roadside.
【Fund】: 国家自然科学基金(40673074);; 广东省科技计划资助(2007B030102001)
【CateGory Index】: X831
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