Document Detail

Determination of atmospheric nitrate particulate size distribution and dry deposition velocity for three distinct areas.
MedLine Citation:
PMID:  16054914     Owner:  NLM     Status:  MEDLINE    
In this study, both atmospheric particulates and dry deposited particulates were collected at a highway intersection, coastal location and suburban area in Taichung, Taiwan for the characterization of nitrate containing particulates (NCPs) in size distribution and dynamic properties. Collected particulates were placed in contact with nitron (C20H16N4) to form distinctive products of NCPs, which were examined by a SEM. For total atmospheric particulates, the sum of NCP and non-nitrate containing particulate (NNCP), the average shape factor values are 1.69, 1.49, and 1.36 for the highway intersection, coastal area and suburban area, respectively. The calculated shape factors show no significant differences with sizes. Dry deposition fluxes and atmospheric concentrations at various size ranges were estimated. The mass distributed in fine particle range (<or=2.5 microm) were 45%, 40%, and 43% for NCP at the highway intersection, coastal, and suburban areas, respectively. The average dry deposition velocities (Vds) of total particulate are 2.5, 1.5, and 1.2 cm s(-1) for highway intersection, coastal area, and suburban area, respectively. The highest Vd was observed from samples taken at highway intersection, suggesting that dust resuspension and particulates from vehicles in the ambient air is of great significance. The Vds of total particulates range over three orders of magnitude for size ranges from 0.32 to 18 microm. The value of Vd increases with the diameter of particles significantly.
Hsi-Hsien Yang; Lien-Te Hsieh; Shih-Kai Cheng
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Publication Detail:
Type:  Comparative Study; Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Chemosphere     Volume:  60     ISSN:  0045-6535     ISO Abbreviation:  Chemosphere     Publication Date:  2005 Sep 
Date Detail:
Created Date:  2005-08-01     Completed Date:  2005-11-03     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  0320657     Medline TA:  Chemosphere     Country:  England    
Other Details:
Languages:  eng     Pagination:  1447-53     Citation Subset:  IM    
Department of Environmental Engineering and Management, Chaoyang University of Technology, No. 168, Jifong E. Road, Wufong Township, Taichung County 41349, Taiwan.
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MeSH Terms
Air Movements
Air Pollutants / analysis*
Dust / analysis*
Environmental Monitoring
Models, Theoretical
Nitrates / analysis*
Particle Size
Reg. No./Substance:
0/Air Pollutants; 0/Dust; 0/Nitrates

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