Abstract:

Based on the 70 surface soil samples with content of heavy metals measured,combining multivariate statistical and geostatistical methods,the distribution characteristics and sources of soil heavy metal contents in Huainan mining area were analyzed.Analysis results indicated that average content of soil heavy metals Cd,Cr,Cu,Ni,Pb and Hg of the study area were 0114,72406,26563,2988,25633,0039 mg/kg respectively,which did not exceed the national soil environmental quality primary standards,and the average contents of Cd and Pb exceeded the Huainan soil background values.Part of the samples of each heavy metal exceeded the national soil environmental quality primary standards and Huainan soil background values,and Cd,Hg and Pb were relatively obvious with the exceeding times of 43,241 and 0565 respectively.Correlation analysis and factor analysis showed that the sources of exceeding part for each heavy metal could be divided into two categories,Cr,Cu and Ni as one class,Pb,Cb and Hg as the other class.Analysis of the spatial distribution of heavy metals found that the exceeding part of the first category heavy metals were mainly located in the Pan three mine and the Xinzhuangzi mine,mainly because coal gangue was weathered and leached under the effects of precipitation,and heavy metals in Gangue internal were leached into the surrounding soil and water,and then the migration and enrichment were occurred,which finally caused serious heavy metal pollution.The exceeding part of the second category heavy metals were mainly located in the old urban of the Xinzhuangzi mine,which was caused mainly by the towns industrial production,transportation,pesticides usage and the city garbage