| Summary: | 碩士 === 弘光科技大學 === 環境工程研究所 === 102 === In this investigation, the concentrations of particles in ambient air, gaseous elemental mercury (GEM), and particulate-bound mercury (Hg(p)) in total suspended particulates (TSP) as well as dry deposition at a (Traffic) sampling site at Hung-Kuang were studied during the day and night in 2012. The results reveal that the mean concentrations of total suspended particulates (TSP) in ambient air, gaseous elemental mercury (GEM), and particle-bound mercury (Hg(p)) were 69.72 µg/m3, 3.17 ng/m3, and 0.024 ng/m3, respectively, at the Hung-Kuang (Traffic) sampling site during daytime sampling periods. The results also reveal that the mean rate of dry deposition of particles from ambient air and particle-bound mercury (Hg(p)) were 145.20 μg/m2*min, and 0.022 ng/m2*min, respectively at the Hung-Kuang (Traffic) sampling site during the daytime sampling period. The mean concentrations of total suspended particulates (TSP) in ambient air, gaseous elemental mercury (GEM), and particle-bound mercury (Hg(p)) were 60.56 µg/m3, 2.74 ng/m3, and 0.018 ng/m3, respectively, at the Hung-Kuang (Traffic) sampling site during the nighttime sampling period. The mean rates of dry deposition of particles and particle-bound mercury (Hg(p)) from ambient air were 132.58 μg/m2*min and 0.016 ng/m2*min, respectively, at the Hung-Kuang (Traffic) sampling site during the nighttime sampling period. In addition, the calculated/measured dry deposition flux ratios of ambient air particles and particulates bound mercury Hg(p) with Wood’s and Petroff &; Zhang’s models were also studied. The result indicated that: Within the particle size of 10, 20 and 23 μm, Petroff &; Zhang’s model exhibited better dry deposition prediction results for ambient air particulates at Hung-Kuang (Traffic) sampling site during the day and night sampling period. However, Petroff &; Zhang’s model per performed better results in the prediction of ambient air particulates bound mercury Hg(p) dry deposition for the particles size of 10 μm at the Hung-Kuang (Traffic) sampling site during the day and night sampling periods. Wood’s model performed better results in the prediction of ambient air particulates bound mercury Hg(p) dry deposition for the particles size of 20 and 23 μm at the Hung-Kuang (Traffic) sampling site during the day and night sampling periods.
|
|---|
