Characteristics and environmental status of heavy metal pollution in farmland soil of an industrial and mining area in Panxi
The contents of heavy metals Cr,Ni,Cu,Zn,Cd and Pb were analyzed in the farmland soil near a permeable river in a mining area of Panxi,and the relationship between heavy metals was discussed.The correlation analysis shows that the correlation between Cr and Ni is very significant,and the determination coefficient is 0.371＜0.4,indicating that the con-tent of Cr is not only affected by Ni,but also by other metals.Pb has no significant correlation with Ni,Cr and Cr with Zn and Cd,showing a certain heterogenicity.The single factor index shows that only Pb pollution level is clean.According to the av-erage value of single factor pollution index of 6 kinds of heavy metals,the degree of heavy metal pollution of soil in the study area is Ni＞Cd＞Cr＞Zn＞Cu＞Pb.The maximum value of Nemero pollution composite index was 5.87,the minimum value was 1.01,and the average value was 3.03.Among the 52 samples,59.61％belong to the moderate pollution level,30.77％belong to the severe pollution level,and 9.62％belong to the mild pollution level.On the whole,the soil environ-mental quality in the study area is seriously polluted.
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