A methodology to establish the morphology of ambient aerosols.

A methodology to establish the morphology of ambient aerosols. Research Abstract Details 

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A methodology to establish the morphology of ambient aerosols. Abstract Text:

Rafael McDonald,Pratim Biswas,

The morphology of ambient particulate matter (PM) is an important characteristic that seldom is measured and reported. A study was performed to determine the viability of a method to establish the distribution of shapes and the fractal dimensions of aggregates of ambient aerosols. Particles of PM with aerodynamic diameter less than or equal to 2.5 microm (PM2.5) were captured on different days via size-independent electrostatic precipitation at two sites in St. Louis and examined in a scanning electron microscope (SEM). Nonvolatile particles between 0.1 and 2.5 microm were readily identified via SEM. Particle shapes were classified as fibrous, spherical, agglomerated, or "other." A computer program using the nested-squares algorithm was developed and used to determine the fractal dimensions of the aggregates. More particles were collected at the St. Louis-Midwest Supersite on June 14, 2002, than were collected on the Washington University campus loading dock on May 31, 2002, but the campus samples had a higher percentage of aggregates. On one day of sampling at the Supersite, the aggregate fraction was highest in the morning (14.3% between 7:00 and 9:00 a.m.) and steadily declined during the day (1.3% between 5:00 and 7:00 p.m.). The fractal dimensions of the aerosols were 1.65 in the morning (7:00-9:00 a.m.), decreased to 1.49 (11:00 a.m.-1:00 p.m.), and then increased to 1.87 (5:00-7:00 p.m.). The results show that the fractal dimension is not a static value and that ambient aerosols are not perfectly spherical.

A methodology to establish the morphology of ambient aerosols. Publishing Authors By Initials

R McDonald,P Biswas,

For similar natural sciences: chemistry: chemistry, physical: particle size research abstracts see: natural sciences: chemistry: chemistry, physical: particle size research

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A methodology to establish the morphology of ambient aerosols. Journal Published:

PUBLICATION TYPE: Research Support, U.S. Gov't,

Journal: Journal of the Air & Waste Management Association

VOLUME: 54

Page Numbers: 1069-78

Journal Abbreviation:

ISSN: 1096-2247

DAY: 11

MONTH: Sep

YEAR: 2004

A methodology to establish the morphology of ambient aerosols. Information

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LANGUAGE: eng

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A methodology to establish the morphology of ambient aerosols. Keywords Mesh Terms:

KEYWORDS: Particle Size

MESH TERMS: methods

Chemical & Substance for Abstract: A methodology to establish the morphology of ambient aerosols. Information

Substance Name: Air Pollutants

Registry Number: 0

Grant and Affiliation Information for A methodology to establish the morphology of ambient aerosols.

AFFILIATION: Aerosol and Air Quality Research Laboratory, Environmental Engineering Science, Washington University in St Louis, St Louis, Missouri 63130, USA.

Country: United States

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MEDLINETA: J Air Waste Manag Assoc

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