Chemical composition and size distribution of aerosol particle in high polluted periods

Abstract

In this study, PM10 and PM2.5 mass concentrations were investigated in Busan Metropolitan City on high pollution episode periods. PM10 and PM2.5 were collected from December 2013 to January 2015. The aerosol samples were collected during Asian dust season and high polluted periods in winter respectively. The collected samples were analyzed by some techniques such as comparison of mass concentration, correlation analysis, chemical composition and particle size distribution. Mass concentration of PM10 in spring season ranged from 62.6 μg/m3 to 131.5 μg/m3. High PM10 and PM2.5 concentration on spring were contributed mainly by Asian-Dust. In wintertime, PM10 and PM2.5 high concentrations were almost contributed by anthropogenic source such as house heating and stagnant meteorological conditions. But, PM2.5 mass concentration did not show any difference according to sampling sites. SEM-EDS results showed that high polluted periods have different chemical composition elements such as Al, Ca, Mo, Zn in spring and Cu, Cr, Mn, Ti, Zr in winter. Particle number distribution on Asian dust season showed that particle counts were increased to the factor of 2 in the size of 5 μm, the size of 3 μm was increased to the factor of 2, the size of 1 μm was increased the factor of 1.6 respectively. On the other hands, particle counts in the size of 1 μm and 0.5 μm were decreased to the factor of 1.6 and 0.3 μm was considerably decreased to the factor of 3.5. Finally, it is possible to establish the proper PM pollution control strategy to evaluate levels of high PM10 and PM2.5 pollution periods, chemical composition and size distribution by detail analysis.