Physical chemical properties and BCR speciation analysis of cr-contaminated soil in plateau

To explore physical and chemical properties and abundant form of Cr pollution red soil in plateau, study the transition and transform rule of Cr in red soil. In this paper, Cr pollution red soil in plateau as the research object, use the leaching toxicity experiment and BCR(Bureau Community of Reference) three steps extraction method, to study the change of valence state and occurrence form of heavy metal. The result shows that the acid red soil pH value is 6.13, organic matter content is 18.8 g/kg, silt and clay proportion is nearly 50%, 60%, high cation exchange capacity. The carbonate bound state accounted for 30.24% of total species, The Fe-Mn oxidation state accounted for 19.31, the organic matter and sulfide bound state accounted for 29.51%, and the residue state accounted for 20.94%. The result shows that the physical and chemical properties of the red soil in plateau have certain effects on the accumulation migration and transformation of heavy metals.