Abstract
Abstract The concentrations of Co, Cr, Cu, Mn, Ni, Pb, Zn, and V in urban topsoil samples collected from inside the Xi'an Second Ringroad, northwestern China were measured by X-ray fluorescence spectroscopy. Correlation coefficient analysis, factor analysis and cluster analysis were used to analyze the data and to identify the possible sources of these heavy metals. The results show that the mean concentrations of Co, Cr, Cu, Mn, Ni, Pb, Zn, and V in urban topsoil from Xi'an are 19.3, 81.1, 54.3, 671.5, 34.5, 59.7, 186.2, and 85.2 mg kg− 1 respectively, which are higher than the background values of Shaanxi soil. The mean concentrations of heavy metals in topsoil divided by the corresponding background values of Shaanxi soil increase in the order of Ni
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