[01] Tochukwu Praise Nwoko, Department of Chemistry, Federal University of Technology, Akure, Ondo State, Nigeria. [02] Olugbenga Oludayo Oluwasina, Department of Chemistry, Federal University of Technology, Akure, Ondo State, Nigeria. [03] Emmanuel Abata, Department of Chemistry, Federal University of Technology, Akure, Ondo State, Nigeria. [04] Olubode Olumuyiwa Ajayi, Department of Chemistry, Federal University of Technology, Akure, Ondo State, Nigeria.

Comparison was made between the bioavailability of heavy metals (Cu, Cd, Pb, Ni.) in a mechanic workshop and a residential dumpsites; samples were randomly collected and analyzed for physicochemical parameters, mobility, bioavailability and speciation of the heavy metals, using standard analytical methods, results show that the bioavailability of the Pb (0.81) and Ni (0.16) was higher in the residential dumpsite samples than the bioavailability of Pb (0.62) and Ni (0.04) in the mechanic workshop dumpsite sample, while the bioavailability of Cu (1.00) was higher in the mechanical workshop dumpsite sample than the bioavailability of Cu (0.91) in the residential dumpsite samples, except for Cd (1.00) which was equal in both dumpsite samples. The total metal concentration of Cu (14±1.39) and (22.86±8.19), Cd (0.62±0.05) and (1.1±0.22), Pb (15.6±2.08) and (11.08±0.89), Ni (14.07±8.79) and (13.37±0.13) in residential and mechanic dumpsite samples respectively, were lower than their target values in the soil. The heavy metal content of the soil samples from the dumpsite including the soil samples from the normal garden soil not subjected to the same conditions as the dumpsite were lower than the target value except for Cd at the mechanic workshop dumpsite, hence does not pose a threat.

Dumpsite, Heavy Metals, Bioavailability, Residual Fraction, Sequential Extraction

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