Oyebamiji Oyedele Oketayo
Federal University,Nigeria
Title: Levels and Risk Assessment of Heavy Metals in Soil and Vegetables from Oil Spillage Areas in Gemade Estate, Lagos State, Nigeria
Biography
Biography: Oyebamiji Oyedele Oketayo
Abstract
The levels of nineteen heavy metals have been determined in twelve soil and six vegetable samples [each for Telfairia ocidentalis (TC) and Vernonia amygdalina (VA)] at Gemade Estate using Energy Dispersive X-Ray Spectrometry (EDXRF). Three identical samples in a different area were also collected and analyzed using the same procedure as control. The levels (mg/kg) were in the order Fe > Ti > Ca > Mn > K> V> Cr > Co> Ni > Zn > Sc > Y > Se > Ga > Sr > Rb > B r> As in soil samples. The concentration of the heavy metals in the vegetables, TC and VA ranged from 1.111 to 14.010 and 0.475 to 29520 mg/kg respectively with their values higher than the WHO/FEPA permissible limits and similar studies. The results indicated that no strong significant correlation and difference exists (r = 0.552: p<0.05, tv = 0.429) between the levels of the heavy metals and control but samples from the oil spillage areas were slightly enriched in Ca, Cr, Ti, V, Fe, As (with Enrichment factors, EF = 1.00 – 1.437 ) and Br, Co, Mn, Ti (EF = 1.00 - 2.16) for soil and plants respectively. The results obtained gave the baseline concentration of these heavy metals in the samples and indicated contamination which could be of serious health concern to residents of such an environment.