The PM2.5 Distribution of Spatial Strength and Chemical Composition in Taichung

• Main Authors: Zeng,Zhang-Wei, 曾章瑋
• Other Authors: Cheng,Wan-Li
• Format: Others
• Language: zh-TW
• Published: 2013
• Online Access: http://ndltd.ncl.edu.tw/handle/90238568104991786389

碩士 === 東海大學 === 環境科學與工程學系 === 101 === This study processed 4 batches of sampling, collecting the atmospheric fine suspended particles vertically and horizontally during 3/21~3/23, 5/22~5/24, 8/8~8/10 and 10/2~10/4 in 2012. The result of PM2.5 vertical sampling indicated the variations in concentration of PM2.5 at 68 meters height was slight. The concentrations were between 23～32μg/m3. But the the variations in concentration of PM2.5 at 11 meters height was greatly at Dali district office. The concentrations were between 28～67μg/m3. The composition analysis of PM2.5 vertical sampling indicated that the highest portion is sulfate, 24.18％ at all height levels. The secondary is organic carbon, 17.72％ then 9.42％ ammonium. The composition of PM2.5 at different height level has the same trend. The composition analysis of PM2.5 horizontal sampling indicated that the highest portion was still sulfate, 24.16％. The secondary was organic carbon, 16.47％ then 10.06％ ammonium. The metals analysis of PM2.5 indicated that sodium and iron had high portions about 1.33％ and 0.89％ then was 0.60％calcium. The content of the others metals were relatively low. Three methods of sampling, high-volume air sampling, β-ray attenuation sampling and manual sampling were used in this study. The sampled PM2.5 weight ratio of these three method is as below. Highvolume air sampling :β-ray attenuation sampling : manual sampling = 1：0.87：0.80。 According to the weight ratio of PM2.5 by the described three sampling methods to analyze the location variation, it showed that the variation of concentration of PM2.5 at the sampling location we chose is slight to the EPA sampling station. Therefore, the chose location in this study during the sampling period can represent the spacial distribution of PM2.5 in Taichung city.