Chemical speciation analysis of heavy metals in soils of hydrometallurgical mining area

Toxicity of heavy metals is related to the content.It is also closely related to its specific chemical speciation.The water soluble, weak acid, reducible, oxidizable and residual states of elements (Cd、Cr、Cu、Ni、Pb、Zn) are extracted.Contents of 6 elements in various chemical speciation are determined by ICP-MS.Speciation distribution and migration ability of heavy metals is analyzed.The results show that the total amount of heavy metals are higher than the soil environmental quality index.Cd and Pb are 7.17 times and 4.14 times higher than those of Cu, Ni and Zn respectively, and Cr is the smallest.According to the analysis results of total heavy metals, morphology distribution and migration ability, the risk level of heavy metals in this area is Cd> Zn> Cu> Ni> Pb> Cr.Speciation of heavy metals is mainly residual state, and the natural environment of wet and humid acid can promote the release of heavy metals and cause two pollution.Therefore, there is a great potential risk of heavy metal pollution in the area.