ASSESSMENT OF SOME TRACE METALS CONTAMINATION OF WATERLEAF (Talinum triangulare) AND ELEPHANT GRASS (Pennisetum purpureum) GROWING AROUND THE NIGERIA PORTS AUTHORITY OPEN DUMPSITE IN WARRI, DELTA STATE, NIGERIA

H. Ataikiru, F.E. Okieimen, M.A. Balogun

Abstract


Warri is a hub of commercial and industrial activities, as a result huge amount of waste is generated. These wastes consist of chemical elements such as lead, chromium, arsenic, mercury, zinc, cadmium, nickel, etc. This study is to assess the levels of heavy metals in vegetables and plants growing in the soil of the NPA Expressway open dump in Warri city. Waterleaf (Talinum triangulare) and elephant grass (Pennisetum purpureum) were collected from the soil of the NPA Expressway open dump and control plant samples were sought and collected 2km away. The concentrations of Pb, Cr, Mn and Zn in the plant samples and the control plant samples were determined using a pre-calibrated atomic absorption spectrophotometer (AAS) with an air-acetylene flame for Zn and a graphite furnace for Pb. The analyses were carried out in triplicates. The results showed that the roots of the plants had the highest concentrations of the heavy metals. The concentrations of the heavy metals in all the tissues of the waterleaf and elephant grass were higher than control samples values and WHO standard values.

Keywords: Industrial, Waste, Metals, Vegetables, Open dump


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Chemical Society of Nigeria