Abstract
Atmospheric dustfall was qualitatively examined for sulfate content by the techniques of chemical micrurgy. Quantitative assessment of suspended sulfate particulate according to size was by cascade impactor sampling and turbidimetric analysis of stage washings as BaSO4. Sulfate particles less than 1.9 micron mass median diameter in size contributed approximately 43% by weight and 90% by number to total particulate sulfate in Pittsburgh air. The mechanics of particulate sulfate formation in the atmosphere are discussed on the basis of these findings.
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