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The soil physico-chemical properties and heavy metals concentrations in different layers of the soil (0 30; 30 60; 60 – 90 and 90 120 cm depth) of Apir and Northbank automobile mechanic villages and control site at University of Agriculture, Makurdi were studied. The analysis showed the soils to be sandy loam clay, with low organic matter content (1.64 2.39 %)), slightly acidic pH (6.29 6.67), high bulk density (1.49 1.52 g/cm 3 ) and porosity (42.2 43.3 %) across depths and locations. The soil samples were digested with a mixture of HNO3 and HCl (1:3 v/v), and analyzed for heavy metals such as Cu, Cr, Zn, Cd, Mn, Ni and Co using Atomic Absorption Spectrophotometer. The soils showed significant levels of the metals above background concentrations with most (Cu, Zn, Mn, Cr and Ni) decreasing with soil depth. Across all the sampling locations and profiles, Mn showed the highest (301 mg/kg) concentration with Cd and Co concentrations below detectable limits (≤ 0). The distribution pattern were in the following order Mn > Cu > Zn > Cr > Ni > Cd > Co. For some of the metals there were significant variations (P 0.05) in concentration across depths and locations.

Influence of Physico-Chemical Characteristics of Soils on Heavy Metal Contamination in Makurdi, Benue State