Abstract:

Abstract: The paper analyzed the speciation of heavy metals in Fe-Mn nodules soil in karst area by using Tessier A sequential extraction method,and determined the heavy metal contents with AAS.The results showed that, in A、B layer soil,residual fraction was the highest proportion in Cd、Cr、Cu、Pb、Zn,Fe-Mn oxides fraction was the highest proportion in Mn;bioavilable of Cd was the highest proportion in all heavy metal contents,while others was very low,so Cd was the mainly cause of pollution,potentially available of Mn was the highest proportion,so should also take note of its impact.