Quantitative spatial characteristics and environmental risk of toxic heavy metals in urban dusts of Shanghai, China

摘要: Associated with the rapid urbanization and industrialization, most of urban parks recreational areas in Shanghai are built close to major roads or industrial areas, where they subject many potential pollution source, including automobile exhaust factory emissions. Urban dusts, containing toxic heavy metals such as Pb, Cr, Cd, Hg As, one main contributors for environmental pollution. In this study, 261 dust samples were collected from two different localities (streets parks) area Shanghai, China. Pb Cr concentrations all determined by atomic adsorption spectrophotometer analyzer, As 74 fluorescence spectroscopy. The mean 287, 157, 1.24, 8.73 0.16 mg kg−1, respectively. Each metal shows a wide range concentration values. comparison background values soil dusts have elevated whole, except those As. 11.3, 2.1, 10.3, 0.997, 1.7 times values, Compared global concentrations, is slightly higher. show normal distribution after logarithmic transformation. second-order variation trends spatial distribution. features five metals, general, illustrate relatively high levels within regions inner-city ring highway southwestern Shanghai. Cd higher Baoshan park shipbuilding industries regions. order risk > highest environment human health among metals. pollutant sources preliminarily concluded follows: may mainly natural source. Burning coal has become source three sources, traffic, building construction, weathering corrosion materials.