[01] Akinrinlola Olumide, Department of Chemistry, Federal University of Technology, Akure, Nigeria. [02] Ochonma Charles, Department of Chemistry, Federal University of Technology, Akure, Nigeria. [03] Oyinloye Jide, Department of Chemistry, Obafemi Awolowo University, Ile-Ife, Nigeria.

The degradation and pollution of soil attendant upon the operation of dumpsites is at an alarming rate. In this study, the physico-chemical properties, heavy metal concentration and chemical speciation of heavy metals in soils of two dumpsites in Osogbo were evaluated and compared with a control soil. The physico-chemical properties (pH, Electrical conductivity, Na, Ca, K, MG, % Organic matter, and Cation Exchange Capacity) of the dump soils is relatively higher than that of the control soil. Also, all the soil samples showed higher sand content, followed by Clay and then Silt. The ranges of heavy metal concentration (mg/kg) are as follows: Cu (0.58 – 21.50), Zn (0.90 – 31.90), Pb (0.01 – 30.01), Cr (0.05 – 10.03), Co (0.01), Mn (0.18 – 10.17), Fe (0.85 – 3.50), Ni (0.10 – 7.08), and Cd (0.01 – 5.08). The result of heavy metal speciation showed that higher quantity of all the determined metals are bound to the residual fraction. The research showed that the operation of dumpsites in those areas have greatly altered the physico-chemical content and massively increased the heavy metal concentration of the soil. Therefore, this study suggests the establishment of mitigating strategies in order to reduce continual contamination of the soil.

Soil, Dumpsite, Physico-chemical Properties, Heavy Metals

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