SPECIATION OF HEAVY METALS IN SOILS OF ELECTRONIC WASTE DUMP IN COMPUTER VILLAGE, IKEJA, LAGOS

J. M. Okuo, D. E. Ogbeifun, H. N. Oguwike

Abstract


Speciation patterns of heavy metals in the soil profiles of electronic waste dump site in Lagos were investigated.  Tessier’s five step sequential extraction techniques were used in order to evaluate their potential bioavailability and degree of contamination.  The metal concentrations in the four fractions of the soils investigated fit in the typical ranges for polluted soils. The speciation results revealed that while Pb was predominantly associated with exchangeable fraction, Cd was found mainly with Fe-Mn oxide fraction; Ni and Cu were associated with organic fraction.  Significant amount of Cd and Ni were also found in carbonate and residual fractions respectively.  Mobility factors were calculated and their values are in the range of 6.0 - 70.2, indicating high mobility and bioavailability of these metals in the soil samples.  The mobility factors for the metals in the soil samples follow the order Cd > Pb > Cu > Ni.  The results from the speciation patterns observed in this study indicate that the metals may be readily available for plants uptake and that there is serious contamination of the soil by Pb, Cd and Ni.


Full Text:

PDF

Refbacks

  • There are currently no refbacks.