Environmental Pollution Risk and Source Analysis of Heavy Metals in Soils Around Typical Copper Deposits in the Middle and Lower Reaches of the Yangtze River
In order to find out the risk of heavy metal pollution in the soil around the copper mine,87 samples of surface soil(0~20 cm)were collected around a typical copper mine in the middle and lower reaches of the Yangtze River.The con-tents of Cu,As,Cd,Cr,Hg,Ni,Pb,Zn and Mo were analyzed and determined.The results showed that the average contents of Cu,Cd,Pb,Zn,As and Mo in the soil of the study area were higher than the background values of Nanjing area.The contents of 9 heavy metals showed island or banded distribution,and the high value areas were mainly concentrated in the northern part of the study area adjacent to the mining area or the central valley area.According to the Nemero comprehensive pollution index calculation,the proportion of surface soil in the study area reaching clean,till clean,mild pollution,moderate pollution and se-vere pollution was 42.53%,26.44%,18.39%,4.60%and 8.04%,respectively.Combined with the single factor index evalua-tion,Cu and Cd were the main pollution contribution factors,and Pb,As and Zn were the secondary contribution factors.Ac-cording to the calculation of comprehensive ecological risk index,67.82%of the surface soil in the study area reached moder-ate ecological risk and above,mainly due to the potential ecological risks of As,Hg,Cu,Cd and Mo.Principal component analy-sis showed that there were three sources of heavy metals in the study area,among which Cu,Zn,As,Hg and Mo were mainly af-fected by industrial and mining activities.Cu,Ni and Cr are mainly affected by natural parent materials.Cd,Zn,As and Pb were mainly affected by agricultural activities.
copper minesoil heavy metalspollutionecological risksource
NETL
NSTL
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