Measurements of size-fractionated concentration and bulk dry deposition of atmospheric particulate bound mercury at three sites in central Taiwan

• Main Authors: Ci-Song Huang, 黃啟松
• Other Authors: Guor-Cheng Fang
• Format: Others
• Language: zh-TW
• Online Access: http://ndltd.ncl.edu.tw/handle/97297227662435860399

碩士 === 弘光科技大學 === 環境工程研究所 === 100 === Abstract This study discusses particulate-bound mercury Hg(p), and ambient air particle concentrations as well seasonal variations of particles concentrations for various sizes (PM18, PM10, PM2.5, and PM1μm) using Micro-Orifice Uniform Deposition Impactors (MOUDI) and Total Suspension Particulates (TSP), between November 2010 and July 2011 at (Westin (Park) Between March 2011 to June 2011)) Hung-kuang (Traffic), Gao-mei (Wetlands) and Quan-xing (Industrial) sampling sites. The results indicated that the highest ambient air particle bound mercury Hg(p) concentrations in TSP occurred in April (0.050 ng/m3) while the highest ambient air particle bound mercury Hg(p) dry deposition flux occurred in June (0.019 ng/m2*min) at Westin Park. Experimental results also demonstrate that the mean particles concentrations of PM18, PM10 and PM1 were highest at the GM sampling site and those of PM18, PM10, PM2.5 and PM1 were lowest at the HK sampling site. The average coarse particles concentrations at all sites were highest in the winter. In addition, the mean Hg(p) concentrations and dry deposition were highest at QX because of the concentration of industrial emissions. Since no significant Hg emission sources are located at GM, the mean Hg(p) concentrations and dry deposition were lowest at this site. At the HK sampling site, the main contributors to the pollution were traffic areas. The seasonal variations of particulate-bound mercury Hg(p) in PM2.5 and PM1 at all sites were highest in winter and lowest in summer. The average coarse particulate-bound mercury Hg(p) (particle sizes > 2.5 µm) concentrations were highest in the spring and winter. They were lowest in the summer. Finally, the size distribution of particulates in air at all three sampling sites exhibited a major peak at 1 µm.