African Journal of
Pure and Applied Chemistry

  • Abbreviation: Afr. J. Pure Appl. Chem.
  • Language: English
  • ISSN: 1996-0840
  • DOI: 10.5897/AJPAC
  • Start Year: 2007
  • Published Articles: 357

Full Length Research Paper

Speciation of heavy metals in soil, and their phytoavailability in edible part of Amaranthus hybridus cultivated along major roads in Ile- Ife, Nigeria

Olabanji Iyabo Oluremi
  • Olabanji Iyabo Oluremi
  • Department of Chemistry, Obafemi Awolowo University, Ile-Ife, Nigeria
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Oluyemi Emmanuel Ayodele
  • Oluyemi Emmanuel Ayodele
  • Department of Chemistry, Obafemi Awolowo University, Ile-Ife, Nigeria
  • Google Scholar
Bello Muibat Olabisi
  • Bello Muibat Olabisi
  • Department of Pure and Applied Chemistry, Industrial and Food Chemistry Unit, Ladoke Akintola University of Technology, Ogbomoso, Nigeria
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Makinde Oladotun Wasiu
  • Makinde Oladotun Wasiu
  • Centre for Energy Research and Development, Obafemi Awolowo University, Ile- Ife, Nigeria
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  •  Accepted: 07 May 2013
  •  Published: 30 May 2013

Abstract

Heavy metal content in soil and Amaranthus hybridus cultivated on it were determined by speciation method and acid dissolution. The atomic absorption spectrophotometer was used to quantify the metals in the soil and vegetable. The mobilisation of metals from soil to plants as indicated by the metal contents in the soil and vegetables decreased in this order Fe> Mn > Zn > Cu >Pb > As ≥ Cd. The metals concentration ranges in the soil and vegetables as follows: {Fe (12.540-20.915), Mn (1.727-2.506), Zn (0.717- 1.571), Cu (0.292- 0.569), Pb (0.019-0.030) As (0.016-0.033) and Cd( 0.015- 0.028)}µg/g : {Fe (7.359-11.205), Mn (0.964-1.580), Zn (0.542- 1.220), Cu (0.010- 0.272), Pb (0.015-0.085) As (0.012-0.019) and Cd (0.012- 0.018)} µg/g respectively. The total metal concentration found in the vegetables was more than the metal uptake from the soil, indicating contamination of the vegetables from other sources. The heavy metals concentrations were within the safe limit of WHO/FAO. There was no statistical significant difference between the metal uptake by vegetable and total metal in the vegetable at 95 and 99% of probability level. At present the vegetables may not pose health risk but the plots needed to be monitored from time to time.

 

Key words: Heavy metals, soil, Amaranthus hybridus, metal uptake.