Sky Journal of Soil Science and Environmental Management Vol. 5(5), pp. 085-090, September, 2016. Available online
ISSN 2315-8794 ©2016 Sky Journals


Full Length Research Paper


Assessment of heavy metals in soil (A case study of a mechanic workshop in Kumin Mashi Kaduna State)

Ogwo E.I1*, Ukaogo O. P2 and Egedeuzu C.S2


1Department of Environmental Resource management, Abia State University, P. M.B 2000, Uturu-Nigeria.
2Department of Pure and Industrial Chemistry, Abia State University, P. M. B 2000, Uturu-Nigeria.


*Corresponding author. E-mail:  Tel.:+2347033808597.


Accepted  24 November, 2016




Soil samples from 24 locations around Kumin Mashi Mechanic Village, Kaduna State, Nigeria were collected and analyzed. The study was undertaken to assess the level of heavy metals present in soils around those locations. Soil depths of 0 - 10 cm and 10 - 20 cm were taken from each spot, producing 48 soil samples while the control sample was taken from an area with no mechanic activities. The samples were collected using the combing and quartering method, dried, sieved and the heavy metal loads were then determined by atomic absorption spectrometry. The mean metal concentration of the heavy metals (Pb, Cd, Fe, Zn) within the auto workshops are 7.36 - 36.9 mg/kg, 8.2 - 60.945 mg/kg, 1963.00 - 8832.800 mg/kg and 52.2 - 115.0 mg/kg respectively while their mean concentrations on the farmlands are 0.718 – 1.157 mg/kg, 0.004 – 0.306 mg/kg, 1244.00 – 3701.400 mg/kg and 12.55 – 31.0 mg/kg respectively. The control sample had concentrations of 0.280 – 0.344 mg/kg, <0.004 mg/kg, 386.000 – 598.400 mg/kg and 6.240 – 8.424 mg/kg respectively. The heavy metal concentrations in the mechanic village soil samples showed marked difference when compared to the control samples but slightly differed from their concentration in the farmlands. Though the metal concentration in the farmlands and the control varied slightly, there is the tendency of heavy pollution above the intervention value, which could come from wastes from mechanic activities. The trend of heavy metal pollution is Fe>Zn>>Pb>Cd. Statistical analysis carried out showed that the load of these heavy metals in the mechanic village was significantly different from values obtained in the farmlands, indicating that the mechanic village is the contributor of these heavy metals. Pearson correlation studies showed that these metals had positive correlations; i.e. increase in Lead content for example caused a corresponding increase in the load of the other elements. The same trend was observed for Cadmium, Zinc and Iron. 

Key words: Concentration, atomic absorption spectrometry, heavy metal.


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