Abuja Journal of Agriculture and Environment (AJAE)

ASSESSMENT OF SOME HEAVY METALS IN ROADSIDE SOILS AND VEGETATION ALONG ANYIGBA-LOKOJA HIGH WAY, KOGI STATE, NIGERIA.
Author(s): AUDU, A., OKOH, M.O., IDRIS, A., AKOH, I, P., AMHAKHIAN, S.O., AKANDE, G.,
Volume/Issue: Volume 1 , Issue 2 (2021)

ABSTRACT:

A study of heavy metals in roadsides soils and vegetation is critical in assessing the potential environmental impact of automobile emissions on soils and vegetation. The impact of heavy metals on soils and vegetation between Ayingba to Lokoja highway, Kogi State, Nigeria, was examined by determining the concentration of selected heavy metals. Soil samples were collected from 0-15cm depth and vegetation samples were collected randomly from four settlements in Kogi state; Ayingba, Ojodu, Itobe and Ajaokuta, and a control sample was taken 500m away from the highway. The concentration of the heavy metals was determined using atomic absorption spectrometer (AAS). The concentration levels of heavy metals in soil in Ayingba were0.41mg/kg,1.45mg/ kg, 2.94mg/kg, 0.16mg/kg, 3.22mg/kg and 1.64mg/kg for Cd, Pb, Zn, As, Cu and Mn respectively, Ojodu;0.36mg/kg 1.34mg/kg, 2.86mg/kg, 0.14mg/kg, 2.96mg/kg, and 1.28mg/kg for Cd, Pb,Zn, As, Cu and Mn respectively, Itobe; 0.36mg/kg, 1.34mg/kg, 2.86mg/kg, 0.14mg/kg, 2.90mg/kg and1.78mg/kg for Cd, Pb, Zn, As, Cu and Mn, respectively, Ajaokuta;0.44mg/kg, 1.48mg/kg, 3.10mg/kg,0.18mg/kg, 3.40mg/kg and 1.82mg/kg for Cd, Pb, Zn, As, Cu and Mn respectively, while control site concentration of heavy metals recorded 0.22mg/kg, 1.17mg/kg, 2.23mg/kg, 0.011mg/kg, 2.30mg/kg, and1.26mg/kg for Cd, Pb, Zn, As, Cu and Mn respectively. And the concentration levels of heavy metals in vegetation in Anyigba were 0.026mg/kg-1, 0.037mg/kg-1, 0.43mg/kg-1, 0.021mg/kg-1, 0.41mg/kg-1, and0.12mg/kg-1 for Cd, Pb, Zn, As, Cu, and Mn respectively, Ojodu;0.024mg/kg-1, 0.034mg/kg-1, 0.38mg/kg-1,0.018mg/kg-1, 0.36mg/kg-1, and 0.081mg/kg-1 for Cd, Pb, Zn, As, Cu, and Mn respectively, Itobe;0.023mg/kg-1, 0.030mg/kg-1, 0.41mg/kg-1, 0.019mg/kg-1, 0.38mg/kg-1, 0.09mg/kg-1 for Cd, Pb, Zn, As,Cu, and Mn respectively, Ajaokuta; 0.031mg/kg-1, 0.042mg/kg-1, 0.46mg/kg-1, 0.023mg/kg-1, 0.40mg/kg-1, and 0.12mg/kg-1 for Cd, Pb, Zn, As, Cu, and Mn respectively. However, the control site was 0.021mg/kg-1,0.020mg/kg-1, 0.34mg/kg-1, 0.006mg/kg-1, 0.23mg/kg-1 and 0.06mg/kg-1 for Cd, Pb, Zn, As, Cu, and Mn respectively. Higher concentration of heavy metals was observed at all locations when compared to the level of heavy metals concentrations of the control site. The concentration of heavy metals recorded at all the locations were observed to be lower than the maximum permissible limit for heavy metals in soil and vegetation set out by the United Kingdom and European Union standards. However, reduction of greenhouse gas emission should be encouraged to prevent its long-term accumulative effect on the soil and environment as well as it potential risks on human.

KEYWORDS:

Heavy metals, Roadside soils, Roadside vegetation, Anyigba, Ojodu, Itobe and Ajaokuta, Kogi State.