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Dry Deposition of Atmospheric Particle-Bound Mercury in the Middle Taiwan

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Volume: 12 | Issue: 6 | Pages: 1298-1308
DOI: 10.4209/aaqr.2012.04.0093
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Guor-Cheng Fang 1, Jen-Hsiung Tsai2, Yan-Heng Lin1, Chia-Ying Chang1

  • 1 Department of Safety, Health and Environmental Engineering, HungKuang University, Sha-Lu, Taichung 433, Taiwan
  • 2 Department of Environmental Science and Engineering, National Pingtung University of Science and Technology, Nei Pu, Pingtung 91201, Taiwan

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.

Keywords

TSP Dry deposition Model Particulates bound mercury Hg(p) Particles


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