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

Heavy metal levels in selected green leafy vegetables obtained from Katsina central market, Katsina, North-western Nigeria

Shuaibu l. K
  • Shuaibu l. K
  • Department of Pharmacy, School of Health Technology, Kankia, Katsina State College of Health Sciences, Katsina, Nigeria
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Yahaya M
  • Yahaya M
  • Department of Pharmacy, School of Health Technology, Kankia, Katsina State College of Health Sciences, Katsina, Nigeria
  • Google Scholar
Abdullahi U. K
  • Abdullahi U. K
  • Department of Pure and Applied Chemistry, Umaru Musa Yar’ Adua University, Katsina, Nigeria
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  •  Accepted: 10 May 2013
  •  Published: 30 May 2013

Abstract

The levels of Lead (Pb), Cadmium (Cd), Iron (Fe), Zinc (Zn) and Copper (Cu) were determined in four different samples of vegetables purchased from Katsina central market using atomic absorption spectrometer. The mean concentrations of metals ranged from 0.071 mg/kg Pb to 0.632 mg/kg Cu. The relative abundance of metals in vegetables followed the sequence Cu (0.483 mg/kg) > Zn (0.268 mg/kg) > Fe (0.260 mg/kg) > Pb (0.095 mg/kg). The levels of Pb and other metals were below the FAO/WHO recommended limits for metals in vegetables. Low concentrations of Pb and absence of Cd in all the samples are indications that these plants contribute less toxic effects of metals. The results showed that, these vegetables are the main sources of essential trace elements. The daily human intakes of metals have also been computed and were observed below recommended values by the FAO/WHO.

 

Key words: Heavy metals, vegetables, Katsina, spectrometry.