SPECIATION OF SELECTED TRACE METALS IN SOIL SAMPLES FROM DUMPSITES IN LAFIA, NASARAWA STATE, NIGERIA
Egila, J.N1, Ibrahim, E.G2 and Ibrahim, M.A.G3
1Department of Chemistry, University of Jos, Jos, Nigeria
2Nasara Spring Water Nigeria Limited, Nasarawa State, Nigeria
3Department of Chemistry, College of Education Akwanga, Nasarawa State, Nigeria
E-mail: Ezekiel_ibrahim@yahoo.com
Abstract: Speciation of lead (Pb), copper (Cu), zinc (Zn), manganese (Mn), iron (Fe), cadmium (Cd), and chromium (Cr) were carried out on soil samples from dumpsites in Lafia, Nasarawa State, Nigeria using Tessier et al., (1979) method. The results for various fractions obtained from the Jos road dumpsite are as follows; for samples taken from 0-5cm Jos Road, the ranges of the fractions are 0.56 to 21.56%, 0.34 to 40.66%, 1.34 to 29.18%, 0.06 to 45.91%, and 0.37 to 12.95% for exchangeable, Fe-Mn oxide, organic, carbonate and residual fractions respectively. For the samples taken from 10-15cm at Jos Road dumpsite the ranges of the fractions are 0.42 to 13.63%, 0.03 to 18.48%, 1.01 to 25.34%, 0.03 to 35.19% and 0.27 to 9.31% for exchangeable, Fe-Mn oxide, organic, carbonate and residual fractions respectively. The results of the fractions obtained from Emir Palace dumpsite are as follow. For samples taken from 0-5cm the ranges of the fractions are 0.25 to 18.34%, 2.73 to 15.58%, 4.02 to 23.28%, 0.07 to 45.25% and 1.57 to 37.43% for exchangeable, Fe-Mn oxide, organic, carbonate and residual fractions respectively. For samples taken from 10-15cm at Emir Palace dumpsite ranges of the fractions are 0.42 to12.62%, 0.80 to 11.59%, 2.16 to 17.33%, 9.86 to 34.48%, and 0.99 to 32.99% for exchangeable, Fe-Mn oxide, organic carbonate and residual fractions respectively. The concentration of these selected metals decreases as the depth of the soil increases. All the selected metals are available in both dumpsite which shows that dumpsite pollute the soil by releasing metals into it.