Total concentration, contamination status and distribution of elements in a Nigerian State dumpsites soil

Abstract

Recent happenings (like fire outbreak and soil contamination) on Nigerian dumpsites had reiterated the need to frequently monitor and assess these dumpsites in order to avert environmental disaster. This study was conducted to determine the concentration and distribution of elements in four selected dumpsites in Ondo State, Nigeria. Soils sampled from the dumpsite were tested for their particle size distribution, cation exchange capacity and elemental concentration. The statistical relationship between the elements present was also carried out by analyzing its concentrations. The results showed that sand and clay were the main particles present in the studied dumpsite soils. The low cation exchange capacity values of the soil from the studied dumpsite showed its low retention capacity and fertility. The elements (calcium, magnesium, potassium) needed as macronutrients for plant growth on the dumpsite soil were not present in a large concentration which may be due to the low nutrient retention capacity of the soil. The heavy metals present in the dumpsite though above recommended permissible limit (with the exception of chromium) showed (through the contamination indices) no immediate risk on man and the environment. Statistical analysis showed that there was a statistically significant difference in the concentration of the elements present on the studied dumpsite soils. There was, however, no statistically significant difference in the studied dumpsites. Whatever future plans the State government may have for these dumpsites, this study had pointed out some areas of the soil that may need to be improved and/or monitored for proper remediation. Keywords: Dumpsites, Metals, Permissible limit, Soil