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Soil Environmental Metals Speciation and Associated Health Risks in Selected Edible Leafy Plants on Amaechi and Four-Corner Dumpsites in Enugu of Enugu State, Nigeria

N A Obasi1, S O Elom1, C O Edeogu1, C O Alisa2, and S E Obasi3
1. Department of Medical Biochemistry, Federal University Ndufu-Alike, Ikwo-Nigeria
2. Department of Chemistry, Federal University of Technology, Owerri-Nigeria
3. Department of Science Laboratory Technology, Akanu Ibiam Federal Polytechnic Unwana-Nigeria
Abstract—This work evaluated environmental metals speciation and the associated health risks using five selected edible leafy plants in Amaéchi and Four-Corner dumpsites in Enugu, Enugu State, Nigeria. The soil and plants samples were obtained from Amaéchi and Four-Corner dumpsites in Enugu and a nearby farm land (control site) and were subjected to standard methods of chemical analysis. Results obtained showed that mean soil physicochemical parameters and total extractable metals were significantly higher (P < 0.05) in the dumpsites compared to control site. Carbon:Nitrogen (C:N) ratio was significantly higher (P < 0.05) in the control site compared to that in Amaéchi dumpsite. Sequential extraction showed higher percentages (%) of the non- residual fraction for all the metals studied except Cu and Cr. The mean order of mobility and bioavailability of the metals were: Pb > Fe > Cd > Zn > Mn > Cr > Ni > Cu. Total mean concentration of metals in roots, stems and leaves of Amaranthus hybridus, Talinum triangulare, Carica papaya, Ipomea batatas and Luffa aegyptica were significantly higher (P < 0.05) in the dumpsites compared to control site. The translocation factor, biological concentration factor and biological accumulation coefficient values of the plant species varied for all the metals. The health risks implications of the study were discussed. 

Index Terms—bioavailability, phytoaccumulation, dumpsites, Amaéchi, four-corner, Enugu

Cite: N A Obasi, S O Elom, C O Edeogu, C O Alisa, and S E Obasi, "Soil Environmental Metals Speciation and Associated Health Risks in Selected Edible Leafy Plants on Amaechi and Four-Corner Dumpsites in Enugu of Enugu State, Nigeria," International Journal of Life Sciences Biotechnology and Pharma Research, Vol. 3, No. 4, pp. 152-165, October 2014.
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