Bioaccumulation Potential of Heavy Metals in Lumbricus Terrestris and Associated Soils in Municipal Open Dumpsites

Authors

  • Uzoka Christopher Ndubuisi  Department of Environmental Technology, Federal University of Technology, Owerri, Nigeria
  • Ibe Colman Chikwem  Department of Science Laboratory Technology, Imo State Polytechnic, Umuagwo, Nigeria
  • Egbuawa Irene Ogechi  Department of Environmental Technology, Federal University of Technology, Owerri, Nigeria
  • Ezikeudu Chinonso Eric  Department of Environmental Technology, Federal University of Technology, Owerri, Nigeria
  • Nwauhiara Michael Obinna  Department of Environmental Technology, Federal University of Technology, Owerri, Nigeria

Keywords:

Bioaccumulation, Heavy Metal, Lumbricus Terrestris, Soil, Open Dumpsites

Abstract

Heavy metal concentrations in Earthworm (Lumbricus terrestris) and in soil samples from three domestic dumpsites located in Owerri, Nigeria were measured spectrophotometrically . Mean metal concentration in dumpsite soils were, 2.02-2.94mg/kg, 7.15-13.45mg/kg, 42.27-52.27mg/kg, 42.51-53.44mg/kg, 1.62-2.84mg/kg, 24.61-36.74mg/kg, 2.74-5.56mg/kg, and 3.12-4.52mg/kg for Cu, Pb, Fe, Zn, Cd, Mn, Cr, and Ni respectively. The mean concentration range recorded in Lumbricus terrestris were, 1.51-2.09mg/kg for Cu, 5.64-9.36mg/kg for Pb, 28.44-35.61mg/kg for Fe, 27.34-39.01mg/kg for Zn, 1.21-2.14mg/kg for Cd, 18.36-21.12mg/kg for Mn, 1.96-3.43mg/kg for Cr, and 2.02-3.26mg/kg for Ni. Control samples of soil and Lumbricus terrestris collected from an area devoid of municipal waste dump were also analysed for these heavy metals. Control soil sample values were 0.62mg/kg, 2,06mg/kg, 5.96mg/kg, 5.43mg/kg, 0.24mg/kg, 4.99mg/kg, 1.25mg/kg and 0.94mg/kg for Cu, Pb ,Fe, Zn, Cd, Mn, Cr, and Ni respectively while Lumbricus terrestris had the values of 0.41mg/kg, 1.37mg/kg, 3.97mg/kg, 5.25mg/kg, 0.15mg/kg, 2.99mg/kg, 0.83mg/kg, and 0.62mg/kg for Cu, Pb, Fe, Zn, Cd, Mn, Cr and Ni respectively. The biota–to-soil accumulation factors (F) calculated were all less than unity for all metals while the order of bioaccumulation of the metals both in soil and in Lumbricus terrestris followed the trend Zn>Fe>Mn>Pb>Cr>Ni>Cu>Cd. Since reptiles, birds and some other vertebrates feed on Lumbricus terrestris, transfer of these metals across the food chain is most likely. Therefore proper waste treatment before disposal in the city of Owerri should be enforced.

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International Journal of Scientific Research in Science and Technology

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Published

2017-10-31

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Volume 3, Issue 7, September-October-2017

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Research Articles

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[1]
Uzoka Christopher Ndubuisi, Ibe Colman Chikwem, Egbuawa Irene Ogechi, Ezikeudu Chinonso Eric, Nwauhiara Michael Obinna, " Bioaccumulation Potential of Heavy Metals in Lumbricus Terrestris and Associated Soils in Municipal Open Dumpsites, International Journal of Scientific Research in Science and Technology(IJSRST), Online ISSN : 2395-602X, Print ISSN : 2395-6011, Volume 3, Issue 7, pp.998-1004, September-October-2017.