Comparative Assessment of Closed and Active Dumpsites Soil in Lagos State, Nigeria
Authors
SALAMI L, ODUNLAMI, M.O and FADAYINI O
Abstract
Leachate from wastes in dumpsites constitutes a threat to the quality of dumpsite soil as it contaminates the soil. This paper assesses and compares the level of contamination in the soil of Oke Afa and Soluos dumpsites. Soil samples were taken from different locations in Oke Afa dumpsite at the surface and at the depth of 0.5 m and 1.0 m. Subsequently, soil samples were also collected from Soluos dumpsite at the surface and at the depth of 0.5 m and 1.0 m using stainless knife. All the soil samples were analysed for heavy metals using atomic Absorption Spectrophotometer. The soil samples were also analysed for pH using pH meter. The results of the analysis revealed that the concentrations of parameters analysed were higher in Soluos dumpsite than the Oke Afa dumpsite except for nickel and chromium which were not detected in Soluos dumpsite. The results in addition showed that in Soluos dumpsite, the concentrations of the parameters analysed decrease as the depth increases downward from the surface but in Oke Afa dumpsite, the concentrations of parameters analysed have no regular pattern as the depth increases downward from the surface. In the two dumpsites assessed, the values of the parameters analysed were below the maximum allowable limits for heavy metals in soil. It was concluded that the level of contamination were below the standard used for comparison in both dumpsites but there is likelihood of having higher concentrations of contaminants in future in Soluos dumpsite since the dumpsite is still receiving wastes from Lagos state. Key Words: Assessment, Concentration, Contamination, Comparative, Dumpsites, Soil, Wastes.