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The vast majority of the investigated minor elements had been enriched relative to the continental crust. Moreover, mean concentrations of Cr, Co, Cu, and Pb were large weighed against those reported in cities far away. Lead air pollution must be investigated further in Philadelphia, where 8 of the 30 test web sites, including those greatly trafficked by civilians, had been at or above the EPA's youngster security limit for Pb in bare soil. High Spearman correlations between Zn and Cu, Zn and Cr, Cu
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