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- Title
Composition and oxidation state of sulfur in atmospheric particulate matter.
- Authors
Longo, Amelia F.; Vine, David J.; King, Laura E.; Oakes, Michelle; Weber, Rodney J.; Gregory Huey, L.; Russell, Armistead G.; Ingall, Ellery D.
- 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. Individual particles (> 1 μm) contain S0 in 95% of the individual aerosol particles analyzed. 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.
- Subjects
OXIDATION states; ATMOSPHERIC sulfur compounds; PARTICULATE matter; X-ray fluorescence; ATMOSPHERIC aerosols; BIOMASS burning; ATMOSPHERIC transport
- Publication
Atmospheric Chemistry & Physics Discussions, 2016, Vol 16, Issue 5, p1
- ISSN
1680-7367
- Publication type
Article
- DOI
10.5194/acp-2016-431