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Heavy metals, a kind of persistent toxic substance (PTS), were taken for the study in this paper. Dust samples (44 in total) were collected in 2006 in Shanghai urban parks. The concentrations of Cu, Pb and Zn in dusts were determined by atomic absorption spectrometer. The concentrations of mean metals in dust samples were in the order Zn > Pb > Cu, where Pb shows the greatest coefficient of...
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