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Determination of Heavy Metal Fallout on the Surrounding Flora and Aquifer: Case Study of A Scrap Metal Smelting Factory in Odogunyan Area, Ikorodu, Lagos- State, Nigeria

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Author Affiliations

  • 1 Environmental Biology Unit, Dept. of Science Laboratory Tech., School of Technology, Lagos State Polytechnic, Ikorodu-Lagos, NIGERIA

Int. Res. J. Environment Sci., Volume 3, Issue (4), Pages 93-100, April,22 (2014)

Abstract

This study was carried out to assess the extent of contamination (of heavy metal leachates from a scrap metal dump) on selected flora and some sources of potable water found in the surroundings of a scrap metal smelting yard. Using the Complete Randomnised Design (CRD), plant samples were taken at varing distances from the scrap metal dumpsite. Three sources of water were also sampled in the vicinity of the scrap metal dumpsite. Using the Atomic Absorption Spectrophotometer (AAS), each of the water and plant samples were analyzed for Arsenic (As), Cadmium (Cd), Chromium (Cr), Lead (Pb) and Nickel (Ni). The study site is in the Odogunyan/Spintex area of Ikorodu, Lagos-Nigeria; and the study was conducted between July – October, 2012. The mean concentration of As, Cd, Cr, Pb and Ni in the water samples ranged from 0.0002 to 0.5150mg/L, 0.00043 to 0.6342mg/L, 0.0195 to 0.5078mg/L, 0.0080 to 5.9958mg/L and 0.0005 to 6.7976mg/L respectively. Mean concentration of As, Cd, Cr, Pb and Ni in the plant samples ranged from 0.9526 to 1.3122mg/kg, 0.7139 to 1.0199mg/kg, 0.8860 to 1.1901mg/kg, 9.8441 to 15.0046mg/kg and 11.1075 to 14.8510mg/kg respectively. Results obtained from this study showed higher concentration of the heavy metals in the water from the well and lower concentration in the borehole. In the plant there was a higher concentration of the heavy metals at distances nearer to the scrap metal dumpsite, and lower concentration as distances increased away from the scrap metal dumpsite. Compared to the WHO standard for heavy metal concentration, results from some wells in this study showed values that were more than 51, 2000, 10, 599 and 399 times above the maximum permissible levels for Ar, Cd, Cr, Pb and Ni respectively in potable water source.

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