alexa BIOACCUMULATION OF HEAVY METALS BY EARTHWORM (LUMBRICUS TERRESTRIS) AND ASSOCIATED SOILS IN DOMESTIC DUMPSITE IN ABRAKA, DELTA STATE, NIGERIA


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Research Article

BIOACCUMULATION OF HEAVY METALS BY EARTHWORM (LUMBRICUS TERRESTRIS) AND ASSOCIATED SOILS IN DOMESTIC DUMPSITE IN ABRAKA, DELTA STATE, NIGERIA

Agbaire, P.O and Emoyan, O. O
  1. Chemistry Department, Delta State University, Abraka
Corresponding Author: Agbaire,, E-mail: [email protected]
Received: 29 June-2012 Accepted: 04 July-2012
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Abstract

Metal concentrations in (earthworm) lumbricus Terrestris and soil samples from six domestic dumpsites located in Abraka Delta State, Nigeria were measure spectrophotometrically after sample digestion. Mean metal content in dumpsite soils were, 14.45-63.12, 1613.83-1967.70, 35.41-53.70, 10.81-73.10, 9.73-47.92, 80.17- 112.13ug/g for Cr, Fe, Mn, Ni, Pb and Zn respectively. While the concentration ranges recorded in L. Terrestris samples were: 7.18-9.65, 347.22-355.76, 19.31-43.59, 3.12-12.64, 4.57-12.62, 53.57-74.52ug/g for Cr, Fe, Mn, Ni, Pb and Zn respectively. The biota–to-soil accumulation factors were all less than unity for all metals. The order of bioaccumulation of the metals followed the trend: Mn >Zn >Pb> Cr>Fe>Ni. The availability of metals in soil was also co-determined by the pH and soil organic matter which accounted for the trend of metal concentration at the various dumpsites. The pH of the soil samples ranged from 4.5-5.7 while organic matter ranged between 1.97-4.22% Since birds and domestic fowls fed on insects and L. Terrestris, transfer of these metals across the food chain are most probable.

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