Determination of accumulated heavy metals in benthic invertebrates found in Ajiwa Dam, Katsina State, Northern Nigeria

摘要

The aim of this study was to investigate the level of Pb, Zn, Cu, Fe and Cd concentrations in various aquatic invertebrate species; Two classes of invertebrate were caught and identified {i.e. three (3) Mullusc: Bivalvia, Turbonilla and Monodonta while the other class are (2) Arthropods:Dysticus and lethocerus americana.} from the Ajiwa Dam at the three (3) Sampling stations using atomic Absorption Spectrophotometry (AAS) method. The result obtained showed that Fe had the highest concentration with average of 0.212mg/g and Pb which has the lowest concentration with 0.051mg/g. The study revealed the accumulation of Zn, Fe, Cu, Cd and Pb by aquatic invertebrates from Ajiwa Dam. The concentration of metals are FeCuZnCdPb while their mean values were 0.04032mg/g, 0.0122mg/g, 0.02266mg/g, 0.0110mg/g and 0.0092mg/g respectively.