Individual particle types in the aerosol of Phoenix, Arizona

Article Abstract:

The elemental compositions of individual particles in aerosol samples collected from Jul. 1989 to Apr. 1990 in Phoenix, AZ, were determined and compared with data reported from aerosol samples collected in the 1980s. The results showed that zero-count particles dominated the fine fraction. Sulfur bearing particles were also common in the fine fraction. Calcium- and silicon-rich mineral particles dominated the coarse fraction but were also present abundantly in the fine fraction. Lead and sulfur concentrations were lower compared with the 1980s samples.

Phoenix, Arizona, Air quality

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Structural variations in individual carbonaceous particles from an urban aerosol

Article Abstract:

Research was done at Arizona State University on the structures of carbonaceous aerosol particles collected in air samples. The research used transmission electron microscopy with electron energy-loss spectroscopy to determine that the particles are generally no bigger than 2 micrometers in diameter and consist of many accumulated spherical segments. The spectroscopy results suggest the particles contain both organic and elemental carbon.

Air pollution

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Fractal geometry of carbonaceous aggregates from an urban aerosol

Article Abstract:

The determination of fractal dimensions for carbonaceous aggregates collected from the aerosol of Phoenix, AZ, is discussed. Morphological variations were quantified among aggregates and related to formation mechanisms by the fractal analysis of transmission electron microscope images. The utility of the fractal analysis technique for the evaluation of formation processes was demonstrated.

Analysis, Usage, Transmission electron microscopes, Fractals

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