Levels of some heavy Metals in Cocoyam (<i>Colocasia esculentum</i>) grown on Soil receiving Effluent from a Paint Industry

Abstract

The levels of some heavy metals in soil samples and tubers of cocoyam (Colocasia esculentum) grown on  soil receiving paint wastes (PWS) has been investigated using Atomic Absorption spectrophotometer  (Unicam 939/959 model). Similar analyses were carried out for the same plant from a control area. The  studies revealed that although the P.W.S contained abnormally high levels of Pb (474.14mgkg^-1) and Cu  (137.85mgkg^-1). The paint waste tuber (PWT) recorded low levels of these metals: Pb (2.13mgkg^-1) and  Cu (13.85mgkg^-1) respectively. Correlation analysis tested at 0.05 level of significance show that no significant correlation existed between the metals levels in the soil and the level in the tuber. In all cases the levels of the metals in the tubers were well below the upper limit documented for unpolluted plant. The results however suggest the ineffectiveness of the use of Colocasia esculentum as a bioindicator for heavy metal pollution in soil. © JASEM