HEAVY METALS CONCENTRATIONS IN TISSUES OF Egeria radiata FROM CREEKS IN BURUTU SOUTH LOCAL GOVERNMENT AREA OF DELTA STATE, NIGERIA
Nwabueze, A. A.
Journal Title:Journal of Environmental Issues and Agriculture in Developing Countries
An experiment was conducted to evaluate the levels of heavy metals concentrations in tissues of Egeria radiata from Obotobe and Gbekobor Creeks in Burutu Local Government Area were investigated. The samples were collected fortnightly for 12 months in 2008. The soft tissues were extracted, weighed and dried in oven for 3 days at constant temperature. Ten grams of the dried samples were homogenized and digested before analysis using the Atomic Absorption Spectrophotometer (AAS). The results obtained showed that the mean concentrations of heavy metals in tissues of Egeria radiata followed an increasing sequence of Hg < Cd < Cr < Mn < Pb < Cu < Ni. Heavy metal concentrations were higher but not significant in the dry season than in the rainy season. Mean levels of lead (Pb) and Cadmium (Cd) were found to be higher than FAO/WHO acceptable standard in fishes and shell fish though not significant, yet manganese and nickel were significantly lower than the standard. There is a need for constant monitoring of levels of heavy metals in the area of study in order to forestall any significant rise in their levels among others was recommended.