Seasonal variations in heavy metals concentrations in soils and Telfairia occidentalis grown around selected dumpsites in Uyo metropolis, Akwa Ibom State
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Abstract
This study was conducted to examine seasonal variations of heavy metals (Cr, Cd, Ni, Cu and Pb) concentrations in soils and Telfairia occidentalis grown around selected dumpsites in Uyo metropolis. Soil samples(0 – 30 cm depth) and plant samples were collected during the wet and dry seasons of 2020/2021. The samples were processed and analyzed in the laboratory by standard methods. The results show that the concentrations of the heavy metals in the soils during the wet and dry seasons were in the order: Cu (14.42)>Pb (6.92)>Cr (3.26)> Cd (2.23)>Ni (1.24) and Cu (12.31)>Pb (5.61) >Cr (2.39)> Cd (2.25) >Ni (1.30 mgkg-1) respectively.The mean concentrations of the heavy metals in the dumpsite soils and Telfairia occidentalis were higher than those of the control samples. Generally, the levels of heavy metals in soils and Telfairia occidentalis were higher in the wet season than in the dry season, although there was no significant
(P<0.05) difference between the two seasons.The transfer factor levels of Pb (0.58), Cr (0.30) and Cd (0.46) were above the WHO/FAO recommended limits of 0.30, 0.02 and 0.20 respectively.All the heavy metals occurred at toxic levels in both seasons.Therefore, awareness creation of the likely effect of cultivation and consumption of crops grown on such soils should be of utmost priorities by constituted authority.
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