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Total extractible concentration of Manganese, Cobalt, Nickel, Copper and Zinc in Soils of Children’s playground within Owerri metropolis, Imo State, Nigeria

Author Affiliations

  • 1Department of Environmental Technology, Federal University of Technology Owerri, Imo State, P. M. B. 1526, Nigeria
  • 2Department of Pure and Industrial Chemistry, College of Natural and Applied Sciences, University of Port Harcourt, P. M. B. 5323, Port Harcourt, Nigeria
  • 3Department of Pure and Industrial Chemistry, College of Natural and Applied Sciences, University of Port Harcourt, P. M. B. 5323, Port Harcourt, Nigeria

Res.J.chem.sci., Volume 6, Issue (3), Pages 38-47, March,18 (2016)

Abstract

Surface soil samples from 9 public school playgrounds across Owerri metropolis were investigated for concentration of single extraction with nitric acid and total extractible metals as sum of species using various extractants. For both total metal determination and sequential extraction procedure, metal concentrations were quantified with A ANALYST 400 Perkin Elmer AAS. Results revealed that total extractible Zn (172.67 ± 65.07 mg/kg) > Mn (99.14 ± 53.58 mg/kg) > Cu (60.18 ± 25.88 mg/kg) > Ni (55.13 ± 15.61 mg/kg), and Co (9.61 ± 3.88 mg/kg) showed higher concentrations in dry season but were much lower than WHO standards and values reported elsewhere. Although percent metal recoveries for rainy season were abnormally high, the mean recovery values ranged from 95 – 188%, indicating good analysis. All playgrounds studied in the three years showed positive correlation with at least one other metal with Pearson’s correlation coefficient ranging from 0.019 to 1 and then strongly negative for a few metals suggesting that all playgrounds had metals from a common source. Two groups of metal – metal correlations were observed ie one group showing strongly negative and all others were weakly positive.

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