2. Species bound to Fe-Mn oxides:- Logically, Fe and Mn occur mainly in the oxide fraction. In the soil Fe (80 %) and Mn (20%) are main contributors. Copper and Lead bond to oxides occur in the same proportions, around 39 % and 49 % respectively. The fraction of As, Cr, Ni, Zn and Hg associated with oxides is very less in the soil especially in the case of Hg.