Soil contamination to heavy metals in contaminated areas, especially in metals extraction mines, has been a major problem in the recent years. Malayer Sormak lead Mine is one of the places that is contaminated to heavy metals. Biochar has recently been suggested as a amendment for the stabilization of heavy metals in contaminated sites and is most widely used. Bone char (bone derived biochar) has a high specific surface area, and the reactive functional groups in bone char may complex and sorb metals in contaminated soils. Bone powder can also be a good absorbent in the adsorption of heavy metals due to active functional groups, high carbon content and ionic exchange strength. Accordingly, at random, from a few points and from 0 to 30 cm depth of this mine soil, samples were collected and, physical and chemical properties and total amount of heavy metals were determined. A part of the bones was converted into a powder by grinder; another part to bone char. Bone char characteristics such as functional groups, specific surface area, morphology and etc was determined. The bone char treated soil samples in the three levels of 3, 5 and 7%, and control soil in 3 replication were incubated. During the incubation on days 1, 3, 7, 30, 90 and 180, samples in order to fractionation were taken from soils. After fractionation of heavy metals, the mobility factor also was measured. For adsorption isotherms, bone char, active bone char and bone powder treated soils (each one at 5/2% level) and control soil samples were incubated for. Adsorption isotherm of whole four Cd, Pb, Cu & Ni metals in two single and competitive modes by the batch method Was determined.
