Heavy Metal Assessment of Ground, Surface and TapudWater Samples in Lagos Metropolis Using AnodicudStripping Voltammetry

摘要

The levels of heavy metal contamination in surface, ground and tap waters collected in some part of Lagosudmetropolis were determined using Differential Pulse Anodic Stripping Voltammetry (DPASV). The samples were analysedudfor their contents of lead, copper and cadmium and were also compared with the WHO (2008) specified contaminant levelsudfor drinking water. The results obtained showed that all the well water and borehole water samples investigated contain highudconcentration of these heavy metals. Lead and cadmium concentrations were found to be above the WHO maximum acceptable concentration (MAC). However, none of the samples had copper concentration above the WHO MAC for copper.udOn the whole samples analysed, only the sample collected from Odo-Iyaalaro stream, Ojota showed no pollution of lead.udOther samples showed pollution of all of the metals analysed. In general, the results show an indication of pollution hazardsudgiven the toxicity of these metals and mostly when the water sources studied represent the major sources of water for theudteeming populace. DPASV results of the samples investigated were found to be comparable with results of same samplesudobtained from independent work carried out by Atomic Absorption Spectroscopy.