Scanning electron microscopy associated with energy dispersive X-ray analysis is used to identify the sources of leadcontaining particles in urban dust. The identities of individual particles (automobile exhaust, paint chips) are established on the basis of characteristic particle morphology and chemical composition. Lead source tracing is greatly facilitated by physically separating and preconcentrating lead-containing particles, but quantitation of the contributions of specific sources requires the combined use of individual particle analysis and determination of lead in physically fractionated
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