Levels of Some Selected Heavy Metals in Roadside Soil Samples of Bauchi Metropolis, Bauchi State, Nigeria

Hassan U. F., Chechet N., Muhammad M., Hassan H. F., Mohammed A.

Abstract


In this study, the levels of zinc, copper and cadmium in roadside soil samples collected from five different major road networks of Bauchi and its environs were determined using Atomic Absorption Spectrophotometric technique. The concentrations of zinc, copper and cadmium under study ranged from 96.67-191.33, 12.33 – 29.67 and 3.67 – 4.00 mgkg-1 respectively. Soil samples from Bauchi – Gombe road were found to contain the highest levels of zinc (191.33 mgkg-1), copper (29.67 mgkg-1) and cadmium (4.00 mgkg-1) respectively. Soil samples from Bauchi – Dass and Bauchi – Maiduguri roads were respectively and equally found to have the highest levels of cadmium (4.00 mgkg-1). The variations in the levels of zinc and copper in all the road networks were found to be significantly different (p ≤ 0.05), whilst the variations in the levels of cadmium in all the road networks were found to be significantly the same (p ≤ 0.05) as determined by one-way analysis of variance (ANOVA). The least significant difference (LSD0.05) further revealed that significant differences exist in the respective levels of zinc and copper in all the road networks of Bauchi. The highest concentrations of all the metals determined were found to be within the threshold limits specified by World Health Organization, WHO[(Zn = 300.00 mgkg-1, Cu = 100.00 mgkg-1 and Cd = 50.00 mgkg-1)] which shows that the soil samples from the road networks of Bauchi are not polluted with the heavy metals determined and the inhabitants are therefore presently safe.


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References


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