The Study on Changes of Chemical Component in PM2.5 and PM10 During the Sand-dust Weather in Beijing

Abstract

O-31A1-6 Background/Aims: The study on health effects of Asian dust has been one of the hotspot in research in northeast Asian area. The aim of the study is to analyze the changes of chemical component in PM2.5 and PM10 during sand-dust weather in Beijing. Methods: Sampling the particles of PM10 and PM2.5 for 30 days continuously on May to June of 2007 and measuring the chemical components of the particles by using atomic absorption spectrometry, fluorescence analysis, and X-ray ICP-MS. Meteorological data from local weather authority SPSS 11.5 software was used for statistical analysis. Results: The concentration of Al, Mn, Sr, Ti, Ni, Ca, Si, Fe, and Mg in PM2.5 and the concentration of Al, Mn, Ti, Ca, Si, Fe and Mg in PM10 in Beijing were lower than that in Alxa League. The concentration of Cu, Zn, Pb, As, Zr, Mo, Cd, K and B in PM2.5 and the concentration of Cu, Zn, Pb, As, Zr, Mo, Cd, K, Ba, and Hg in PM10 in Beijing were higher than that in Alxa League. In Alxa League, the concentration of Zr, Mo, Cd, Hg, Pb, Cu, and Zn in PM2.5 and the concentration of Zr, Mo, Cd, Hg, Pb, and B in PM10 in sand-dust weather were as same as them in the weather without sand and dust. On the contrary, the concentration of other elements were increased. When the sand-dust weather happened, the concentration of some metal element in Beijing increased. Conclusion: The level of some hazardous heavy metals in the PM are higher in Beijing during sand-dust weather, which may come from the vehicle exhaust pollution of Beijing.