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ABSTRACT
The evaluation of elemental speciation in environmental sample is a significant step to understanding the potential environmental risk, mobility and bioavailability of pollutants. Soil samples were collected from scrap heap and mechanic workshops in Uwelu spare parts, Benin City. The control soil samples were collected from about 60m away from the sampling sites. Grid sampling method was used to collect both the parent and the control sample. The parents and the control soil samples were analysed for physicochemical properties using standard methods. The heavy metals were fractionated into their different geochemical forms in the parent or contaminated soils using Community Bureau of References (BCR) standardized sequential extraction methods. The parent soil was amended with poultry droppings and inorganic fertilizers (NPK 15:15:15) with doses ranging from 5 -20 % and allowed for a stabilization period of 8 weeks. The result of the pH ranges from 6.30 – 7.10, the water holding capacity ranges from 45 – 55 %, the bulk density ranges from 1.0 – 1.07g/ml, the moisture content ranges from 5.22 – 5.29 % The contaminated and control soils were mainly sandy (64.00 – 79.00 %).The CEC ranges from 6.51- 13.47 meq/kg, the electrical conductivity ranges from 355.00-678.00µs/cm, and organic carbon ranges from1.34-2.59 %. Fractionation results show that the heavy metals (Pb, Zn, Cu and Fe) were found. The results of the amended soil show that there is gradual decrease from the more labile fractions to the more stable fraction.
