TY  - JOUR
T1  - Heavy Metals Contamination of Topsoil and Dispersion in the Vicinities of Reclaimed Auto-Repair Workshops in Iwo, Nigeria
AU - , Ayodele Rotimi Ipeaiyeda AU - , Modupe Dawodu AU - , Yewande Akande 
JO  - Research Journal of Applied Sciences
VL  - 2
IS  - 11
SP  - 1106
EP  - 1115
PY  - 2007
DA  - 2001/08/19
SN  - 1815-932x
DO  - rjasci.2007.1106.1115
UR  - https://makhillpublications.co/view-article.php?doi=rjasci.2007.1106.1115
KW  - Auto-repair
KW  -lead
KW  -mercury
KW  -soil
KW  -heavy metals
KW  -dispersion
AB  - Growing concern about reclamation of auto-repair workshop areas for residential and agricultural purposes makes risk assessment of heavy metal contamination in auto-repair workshop soils in Iwo, Nigeria imperative. In addition, the study is aimed at ascertaining the dispersion of contaminated heavy metals, notably Zn, Ni, Cr, Hg and Pb within the soil profile. Significant levels of contamination were found in view of elevated levels of the metals above background concentrations in control sites. Lead was the most significant contaminants and the degree of contamination was highest for Pb followed by Hg. Average factors of accumulation within the soil profile metals were Zn-3.37, Ni- 3.38, Cr-6.22, Hg-14.5 and Pb-21.1. Average topsoil metal concentrations (0-10 cm) in auto-repair workshop areas were: Zn-0.90&plusmn;0.5 mg kg <SUP>1</SUP>, Ni-11.5&plusmn;3.3 mg kg <SUP>1</SUP>, Cr-5.3&plusmn;2.3 mg kg <SUP>1</SUP>, Hg-9.4&plusmn;4.6 mg kg <SUP>1</SUP> and Pb-133&plusmn;66 mg kg <SUP>1</SUP>. The detailed levels of total metal contamination for Pb and Hg exceed international thresholds for agricultural use. The general trend of dispersion of metal contaminants within the soil profile studied is Pb>> Ni> Hg> Cr>>Zn.
ER  -