Distribution and Risk Assessment of Some Heavy Metal Elements in the Contaminated soil from Baiyin City, Gansu Province

According to relevant standards and methods, ecological risk assessment and source analysis of 7 heavy metals (Ni, Cu, Zn, Cr, Cd, Pb and Hg) in the area Dongdagou of Baiyin were carried out. The results showed that the order of the average content of heavy metals in the soil in the sampling area was Zn > Cu > Pb > Cd > Cr> Ni > Hg. Among them, Zn, Cu and Pb have got unacceptably high levels, and the content of Cd was moderately exceeded. The order of the coefficient of variation of metals was Zn > Cd > Cu > Hg > Pb > Ni> Cr; soil pollution was characterized by compound pollution; the potential ecological risk coefficient of heavy metals was Hg > Cd > Cu> Pb > Zn > Ni > Cr. The comprehensive evaluation of potential ecological hazards of heavy metals showed that heavy metal pollution in the entire study area constituted a high-intensity ecological hazard. Therefore, the control of heavy metal pollution in the soil needs to be further strengthened.