Abstract
We had carried out the sampling of PM2.5 and PM1 in Beijing, China from Jan. 9-23, 2013. The mass concentrations, inorganic ions, water soluble organic carbon and trace elements were measured. The highest mass concentration of PM2.5 was 364 µg/m3 and mass concentrations of six samples were almost the same as those measured by the U.S. Embassy in Beijing. The ratios of PM1 to PM2.5 were more than 0.95. The total amount of water soluble components increased during Jan.11- 14 and Jan.18- 23 and their ratios to the PM2.5 mass concentrations were greater than 0.6. The lowest ratio of nitrate to sulfate, 0.59, was observed during Jan.11- 14 when the highest concentration of PM2.5 was measured. The concentrations of 57 trace elements were determined by an ICP/MS analysis. The As/V and Pb/Zn ratios were evaluated as indicators of anthropogenic emission sources such as coal combustion. We obtained 8.5 as As/V and 0.77 as Pb/Zn that were higher than those in previous reports. The increasing emissions from coal combustion for home heating should be one of the causes of the high PM2.5 concentration.
