In this work, the BCR (Community Bureau of Reference) sequential extraction scheme (exchangeable weak acid-soluble, reducible, oxidizable, and non-extractable metal fractions) was applied to selected soil samples. Soil samples were taken from 15 different sites and the contents of Cd, Cr, Cu, Ni, Pb, and Zn in the mobile and residual fractions of the soils formed on the Karadağ volcanic materials were determined by the BCR (BCR method, currently known as SM&T (the Standards Measurements and Testing Programme) sequential extraction procedure and the mobility of each metal was revealed on the basis of fractions. The order of heavy metals in each fraction of Karadağ samples was observed as follows: Cd: Acid and Water Soluble > Reducible > Oxidizable > Residual; Cr: Residual > Oxidizable > Reducable > Acid and Water Soluble; Cu: Residual > Oxidizable > Reducable > Acid and Water Soluble; Ni: Residual > Reducable > Oxidizable > Acid and Water Soluble; Pb: Reducible > Residual > Oxidizable > Acid and Water Soluble; Zn: Residual > Reducable > Oxidizable > Acid and Water Soluble According to the data obtained, while the concentrations of Cd and Pb in the mobile fraction were higher than those in the residual (immobile) fraction in Karadağ; Cr, Cu, Ni, and Zn were higher in the immobile fraction. When the higher mobility levels of, Cd and Pb are evaluated in terms of environmental pollution and toxicity in soil, these metals have been found to have a higher potential risk than other metals. Because the metals in the first three fractions can dissolve depending on environmental conditions, pollute underground and other water resources, and these metals can be taken up by plants. According to the results obtained, Cd and Pb are likely to be in close contact with plant roots and thus could potentially affect soil fertility. In order to avoid threats to productivity and food security in the long term, it has been determined that further trace metal inputs to soils in these areas should be avoided by agricultural management or other means.