Abstract
The sulfur component of the St. Louis ambient aerosol has been continuously monitored using a flame photometric detector (FPD) to measure particulate sulfur concentration, and in situ thermal analysis to chemically analyze the aerosol for H 2SO 4 and its ammonium salts, NH 4SO 4, (NH 4) 3H(SO 4) 2, and (NH 4) 2SO 4. During the sixteen day monitoring period, the sulfate aerosol varied with respect to chemical composition, but tended to be in the form of the ammonium salts rather than in the form of sulfuric acid. Comparison of particulate sulfur levels with the light scattering coefficient during the monitoring period indicates that particulate sulfur was a significant constituent of the light scattering aerosol, but its mass accounted for less than half of the mass of the light scattering aerosol.
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