Samples of dust-loaded leaves of Osmanthus,Camphor and ceder were collected around ten air quality monitoring stations in Nanjing.The magnetic parameters and heavy metal contents of leaf samples were measured.The correlations were analyzed between magnetic parameters of leaves and concentrations of airborne particulate matter obtained by the air quality monitoring stations,as well as heavy metal contents of leaves.Results showed that the contents of Fe,Mn,Cu and Pb in three kinds of leaves were all higher,whereas the contents of As,Cd and Sb were relatively lower.Contents of Pb,Cu and Sb were higher in traffic concentrated areas,whereas the contents of Ni,Cd and Mn were higher in industrial areas.Contents of V,Cr and Fe were enhanced in areas close to urban construction areas.Elements including V,Fe,As,Pb,Sb and Cr shared the similar sources with magnetic minerals on dust-loaded leaves.Among the three kinds of trees,ceder leaves enriched particulate matter more easily,resulting in higher magnetic parameter values and heavy metal contents of leaf samples.The Pearson's coefficients between most heavy metal contents and magnetic parameters of leaves were also higher for ceder than Osmanthus and Camphor.Meanwhile,good consistency was found between SIRM values of Osmanthus leaves and the airborne particulate matter concentrations at the 10 sampling sites.The magnetic parameters of dust-loaded leaves of evergreen trees have the potential to be used for evaluating urban air pollution.
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