Heavy Metal Elements Pollution and Crop Effect of a Copper Mine

The environmental effect of water-soil-plant heavy metals was surveyed and discussed in a copper mine which located in Heilongjiang province. Results indicate that the acid waste water generated from oxidation and leaching from low grade sulfide ore was the mainly source to cause the pollution of acid water and heavy metals. There is a heavy pollution in upper Niqiu river, the content of Cu, Ni, Cd and Zn are 83.4, 62.0, 31.3, 10.0 fold of class Ⅲ surface water standard, where the pH ranges from 3 to 4. Although the content of heavy metals decreased, middle and lower reaches river even belong to the national standards poor five kind of water. The results of Nemerow multifactor index method showed that the comprehensive pollution index (P_N) of 93.28 percent of soil samples were lower than 0.7, belong to none-pollution. Compared to soil background values of neighborhood, the P_N of 23.12 percent of soil samples were higher than 0.7, belong to slight pollution and above. However, the exceed multiples were minor which showed not serious accumulative pollution. The contents of heavy metals in crop generally exceeded regional background values. In addition, The Ni and Zn content were higher than the national food safety standards of China. The research results provide scientific basis for heavy metal pollution of water and soil.