Chemical Forms of Heavy Metals in Carbonate—Derived Laterite and Enrichment of Its Iron Oxide Minerals

In this paper the seven-step continuous extracting method was employed in the study of chemical forms of the six heavy metals Co,Zn,Pb,Cu,Cr and Mn,The result shows that the etals in the laterite are present in the chemical form of crystalline iron oxides and residues,and they are transformed towared organic and exchangeable forms in the surface soil.Linear regression analysis indicates that the above heavy metals have a positive correlation with the crystalline iron oxide minerals.The crystalline iron oxide minerals have a very important role to play in the enrichment of heavy metals,especially the solid components in the laterite.

Chemical forms of heavy metals in carbonate-derived laterite and enrichment of its iron oxide minerals

In this paper the seven-step continuous extracting method was employed in the study of chemical forms of the six heavy metals Co, Zn, Pb, Cu, Cr and Mn. The result shows that the metals in the laterite are present in the chemical form of crystalline iron oxides and residues, and they are transformed toward organic and exchangeable forms in the surface soil. Linear regression analysis indicates that the above heavy metals have a positive correlation with the crystalline iron oxide minerals. The crystalline iron oxide minerals have a very important role to play in the enrichment of heavy metals, especially the solid components in the laterite. This project was financially supported by the National Natural Science Foundation of China (No. 49463011).