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E3 Journal of Environmental Research and Management

E3 Journal of Environmental Research and Management Vol. 4 (3) pp. 0214-0218, April 2013; © E3 Journals; ISSN 2141-7466

Evaluation of concentration of heavy metals in leaf tissues of three improved varieties of Manihot esculenta crantz.

Mbong E.O 1 *
1 Department of Botany and Ecological Studies, University of Uyo, P. M. B. 1017, Uyo.AkwaIbom state-Nigeria
*Corresponding Author E-mail: joesplendid@yahoo.com
Accepted 11 March 2013

Abstract

The bioaccumulating ability of three varieties of cassava (Manihot esculenta Crantz) was studied under normal field conditions using perforated polythene bags. The varieties used in this study were TMS/30572, TMS/97/0505, TMS/96/0581. The heavy metals investigated were Cadmium (Cd), Chromium (Cr), Iron (Fe), Lead (Pb) and Zinc (Zn). Leave samples were collected from the plants twelve weeks after planting (12 WAP) prepared by dry ashing before analysis. The study revealed that heavy metals were significant (P<0.05) in the plant samples (TMS/30572, TMS/97/0505, TMS/96/0581). The least and highest concentrations recorded were <0.01 mg kg-1 of Cd in TMS/30572 and 98.55 mg kg-1 of Fe in the same variety. Generally, the heavy metals content of these plants is relatively high when compared with standard recommendations. The result of this work has practical applications in environmental science, health management and crop improvement.

Keywords: Manihot esculenta, heavy metal, soil, bioaccumulating.

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