composition and oxidation state of sulfur in atmospheric particulate matter
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2016
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Abstract
The chemical and physical speciation of atmospheric sulfur was
investigated in ambient aerosol samples using a combination of sulfur
near-edge x-ray fluorescence spectroscopy (S-NEXFS) and X-ray fluorescence (XRF) microscopy. These techniques were used to determine the composition
and oxidation state of sulfur in common primary emission sources and ambient
particulate matter collected from the greater Atlanta area. Ambient
particulate matter samples contained two oxidation states: S0 and
S+VI. Ninety-five percent of the individual aerosol particles
(> 1 µm) analyzed contain S0. Linear combination
fitting revealed that S+VI in ambient aerosol was dominated by ammonium
sulfate as well as metal sulfates. The finding of metal sulfates provides
further evidence for acidic reactions that solubilize metals, such as iron,
during atmospheric transport. Emission sources, including biomass burning,
coal fly ash, gasoline, diesel, volcanic ash, and aerosolized Atlanta soil,
and the commercially available bacterium Bacillus subtilis, contained only S+VI. A
commercially available Azotobacter vinelandii sample contained approximately equal proportions of
S0 and S+VI. S0 in individual aerosol particles most likely
originates from primary emission sources, such as aerosolized bacteria or
incomplete combustion.
| Reference Key |
longo2016atmosphericcomposition
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|---|---|
| Authors | ;A. F. Longo;D. J. Vine;L. E. King;M. Oakes;R. J. Weber;L. G. Huey;A. G. Russell;E. D. Ingall |
| Journal | Journal of agricultural and food chemistry |
| Year | 2016 |
| DOI |
10.5194/acp-16-13389-2016
|
| URL | |
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