Publisher: Chemical Society of Nigeria

Dispersion Pattern of Trace Metals In Soils Surrounding Solid Waste Dumps In Nsukka

C. O. B Okoye, K. E Agbo
KEYWORDS: Dumpsite, soil, heavy metals, dispersion pattern


The dispersion pattern of trace metals in soils surrounding municipal solid waste dumps was studied using three major dumps within Nsukka urban. Soil samples were collected at three positions (At dump, 5m and 10m from the dumpsites), and two depths (0-7cm and 15-20cm), in dry season (January), and wet seasons (August) respectively. Atomic Absorption Spectrometric method was employed in the determination of the concentrations of Cd, Cu, Fe, Pb, and Zn in the soil samples. All Sampling and determinations were done in duplicates. Levels of heavy metals were higher at the dumps than at distances away .While the concentrations of Cd, Fe and Zn were lower in the subsoil, Cu and Pb were found to be more concentrated at 15-20cm depth because of low mobility. Difference in the mean concentration of metals between the positions irrespective of the dumpsite were significant (p>0.05). The concentration gradient decreased steadily with distance from the dumpsites. Dispersion was more in wet seasons than in dry seasons. In order to elucidate the impact of soil physicochemical characteristics on the pattern of trace metals dispersion, total dissolved solid TDS, Electrical conductivities EC, pH, SO42-, Cl-, NO3-, PO43-, clay content, silt, sand and organic matter, were determined by standard methods. Clay showed negative correlation with all the metals(r= -1.000for Cd & Pb respectively at 15-20cm depth), while organic matter and PO43- respectively have significant positive correlation with Cd(r=1.000), and Pb (r=1.000 & 0.999) in top soil.

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