Abstract
Sampling and analysis techniques appropriate for the determination of the chemical composition of sulfate in aerosol particles are described. These techniques are applied to the speciation of sulfate in ambient air-borne particles with time resolution of one hour or less and with size discrimination in the size range below 0.25 μm. Initial East Coast data are reported indicating the dominance of sulfuric acid and its ammonianeutralization products in ambient sulfate-containing particles. Data from a comparison study of several analytical techniques for aerosol sulfate and related species are highly correlated. Diffusion sampling experiments for size-segregated chemical composition determination indicate that 1 2 of airborne sulfate is in particles <0.3 μm dia. Hourly variations in sulfate chemical composition at 3 RAMS sites in and near St. Louis, MO. are documented for a one-day intensive experiment and are correlated with air-mass backward trajectories and area primary sources.
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