| Theoretical study of the impact of particulate matter gravitational settling on ambient coarse particulate matter monitoring for agricultural emissions. | |
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MedLine Citation:
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PMID: 17269236 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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The particle size distributions (PSDs) of particulate matter (PM) in the downwind plume from simulated sources of a cotton gin were analyzed to determine the impact of PM settling on PM monitoring. The PSD of PM in a plume varies as a function of gravitational settling. Gravitational settling has a greater impact on the downwind PSD from sources with PSDs having larger mass median diameters (MMDs). The change in PSD is a function of the source PSD of emitted PM, wind speed, and downwind distance. Both MMD and geometric standard deviation (GSD) in the downwind plume decrease with an increase in downwind distance and source MMD. The larger the source MMD, the greater the change in the downwind MMD and GSD. Also, the greater the distance from the source to the sampler, the greater the change in the downwind MMD and GSD. Variations of the PSD in the downwind plume significantly impact PM10 sampling errors associated with the U.S. Environmental Protection Agency (EPA) PM10 samplers. For the emission sources with MMD > 10 microm, the PM10 oversampling rate increases with an increase in downwind distance caused by the decrease of GSD of the PSD in the downwind plume. Gravitational settling of particles does not help reduce the oversampling problems associated with the EPA PM10 sampler. Furthermore, oversampling rates decrease with an increase of the wind speed. |
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Authors:
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Lingjuan Wang; Calvin B Parnell; Michael D Buser |
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Publication Detail:
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Type: Journal Article |
Journal Detail:
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Title: Journal of the Air & Waste Management Association (1995) Volume: 57 ISSN: 1096-2247 ISO Abbreviation: J Air Waste Manag Assoc Publication Date: 2007 Jan |
Date Detail:
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Created Date: 2007-02-02 Completed Date: 2007-02-26 Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 9503111 Medline TA: J Air Waste Manag Assoc Country: United States |
Other Details:
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Languages: eng Pagination: 111-5 Citation Subset: IM |
Affiliation:
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Department of Biological and Agricultural Engineering, North Carolina State University, Raleigh, NC 27695-7625, USA. ling_wang@ncsu.edu |
Export Citation:
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APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
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Agriculture* Air Movements Air Pollutants, Occupational / analysis* Algorithms Dust / analysis Environmental Monitoring Particle Size |
| Chemical | |
Reg. No./Substance:
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0/Air Pollutants, Occupational; 0/Dust |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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