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  • 1 Shanghai Institute of Applied Physics, Chinese Academy of Sciences P.O. Box 800-204, Shanghai 201800, P.R. China
  • 2 Shanghai Institute of Applied Physics, Chinese Academy of Sciences P.O. Box 800-204, Shanghai 201800, P.R. China
  • 3 Shanghai Institute of Applied Physics, Chinese Academy of Sciences P.O. Box 800-204, Shanghai 201800, P.R. China
  • 4 Shanghai Institute of Applied Physics, Chinese Academy of Sciences P.O. Box 800-204, Shanghai 201800, P.R. China
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Summary  

Single aerosol particles were analyzed in the ambient air of the center of Shanghai by scanning proton microprobe to obtain characteristic X-ray spectra (micro-PIXE) which were considered to be the fingerprints of these aerosol particles. The origin of the lead-containing particles was identified by the combination of the micro-PIXE spectra with pattern recognition technique. It was found that the most of the lead-containing particles were derived from vehicle exhaust, coal combustion and soil dust.