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Analysis of some heavy metals (Pb, Cd, Cr, Fe , Zn) in processed cassava | Abstract
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Abstract

Analysis of some heavy metals (Pb, Cd, Cr, Fe , Zn) in processed cassava

Author(s): Dibofori-Orji A. N., Edori O. S.

The level of some heavy metals: Lead, Cadmium, Chromium, Iron, and Zinc (Pb, Cd, Cr, Fe & Zn ) in “garri” sold along a busy road was investigated. Station road, within Port Harcourt metropolis, was chosen as sampling point. For comparison purpose, garri sample protected from the prevailing environmental conditions was also analyzed for the above metals. AAES procedure according to ASTM (2000) standard methods was used. Results obtained were compared with FAO / WHO (2001) dietary allowance for trace metals in foods. Accumulation factor (AF) of each of the metals was calculated by a ratio of the values of the concentration of metals in the test samples and reference values. The garri samples were slightly contaminated by Pb (0.13), excessively polluted by Cd (26.0) and Cr (93.0) and slightly polluted by Zn(1.31) and Fe (1.65). The presence of the heavy metals in the unexposed garri could be traceable to the soil. The elevated levels of the metals in the exposed garri, could however be attributed to deposition from the prevalent environment laden with metallic pollutants from automobile exhaust emissions, industrial and commercial activities.