SOURCES OF TOXIC TRACE-ELEMENTS IN URBAN AIR IN ILLINOIS

Samples of airborne inhalable particulate matter (PM-10) were collecte d in southeast Chicago and East St. Louis and analyzed for 29 trace el ements using X-ray fluorescence spectrometry and neutron activation an alysis. Wind trajectory analysis, factor analysis, and chemical mass b alance modeling were used to determine the most important sources of t he toxic trace elements. Industrial complexes were the most significan t sources of copper and cadmium in East St. Louis (smelters) and of ma nganese and chromium in southeast Chicago (steel mills). It is conclud ed that some sources have a large effect on the concentrations of spec ific toxic metals in the atmosphere without significantly affecting ov erall PM-10 levels.