Abstract
The cause of heavy metal contamination in urban topsoil is discussed. Use factor analysis method on a single factor pollution index matrix,to screen three common factors whose accumulative contribution rate accounts for 95%, and then analyze coefficients of the rotating component matrix, and extract several heavy metal elements significantly associated with common factors for a comprehensively analysis of the cause of contamination.The results are as follows: the first common factor is significantly correlated with heavy elements Hg, Cu and Cd, whose main cause is industrial pollution; the second common factor is significantly correlated with heavy elements As, Pb and Zn, whose main causes are traffic pollution and industrial pollution; the third common factor is significantly correlated with elements Cr, Ni and Zn, whose main causes are domestic pollution and industrial pollution.
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