Abstract
Atmospheric particle-bound mercury Hg(p) concentrations and dry deposition were investigated at Westing Park and Taichung airport sampling sites in the middle of Taiwan during the years 2011 and 2012.The calculated/measured dry deposition flux ratios of ambient air particles and Hg(p) with Petroff and Zhang’s model were also studied. At the Westing Park sampling site, the particle-bound Hg(p) concentration and Hg (p) dry deposition velocity were 0.022 ng/m3 and 1.74 cm/sec, respectively, while at the Taichung airport sampling site these were 0.027 ng/m3 and 1.03 cm/sec, respectively. The average calculated/measured dry deposition flux ratios for ambient air particles and Hg(p) at average particle sizes of 10, 20 and 23 μm in were 0.79, 1.22, and 1.43, and 0.93, 1.43 and 1.69 at the Westing Park sampling site, respectively. The average calculated/measured dry deposition flux ratios for ambient air particles and Hg(p) at average particle sizes of 10, 20 and 23 μm were 0.92, 1.42, and 1.67, and 1.05, 1.61 and 1.90 at the Taichung airport sampling site, respectively. This study also found that Petroff and Zhang’s model produced the best for the prediction of ambient air particulates and Hg(p) dry deposition for a particle size of 10 μm at both the Westing Park and Taichung airport sampling sites, and that the results became worse as the particle size increased.
Highlights
The overwhelming majority of airborne mercury is Hg0, Hg2+ and Hg(p) are more readily dry- and wet-deposited and can have more significant impacts near emission sources (Lai et al, 2007)
This study found that Petroff and Zhang’s model produced the best for the prediction of ambient air particulates and Hg(p) dry deposition for a particle size of 10 μm at both the Westing Park and Taichung airport sampling sites, and that the results became worse as the particle size increased
The average calculated/measured fluxes ratios for 10, 20, and 23 μm were 0.79, 1.22 and 1.43, at Westing Park sampling site, respectively. This result further revealed that the Petroff and Zhang’s model performed better results in the prediction of ambient air particulates dry deposition for the particles size of 10 μm at the Westing Park sampling site
Summary
The overwhelming majority of airborne mercury is Hg0, Hg2+ and Hg(p) are more readily dry- and wet-deposited and can have more significant impacts near emission sources (Lai et al, 2007). Dry deposition is considered a main pathway for removal of contaminants from the atmosphere. While eliminating constituents from the atmospheric environment, these pathways transport constituents to terrestrial surfaces and receiving waters (Artina et al, 2007). Due to its rapidly expanding economic and industrial developments. Urban air pollution is rapidly becoming an environmental problem of public concern worldwide (Lin et al, 2005, 2008). It can influence public health and local/regional weather and climate. China is currently considered to be the engine of the world’s economic growth (Bhaskar and Mehta, 2010).
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