African Journal of
Agricultural Research

  • Abbreviation: Afr. J. Agric. Res.
  • Language: English
  • ISSN: 1991-637X
  • DOI: 10.5897/AJAR
  • Start Year: 2006
  • Published Articles: 6688

Full Length Research Paper

Study of potential environmental risk of trace metallic elements in mine tailings: Case of Draa Lasfar functional mine in Marrakech - Morocco

Barkouch Yassir
  • Barkouch Yassir
  • Laboratoire de Toxicologie et d?hygiene Industrielle, 1 rue Gaston Veil, 44035, Nantes Cedex, France.
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El Fadeli Sana
  • El Fadeli Sana
  • Departement de Biologie, Faculte des Sciences Semlalia, Bd Moulay Abdellah Bp, 2390-40001, Marrakech Morocco.
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Khadiri Mohy Edine
  • Khadiri Mohy Edine
  • Laboratoire de Physique de Solide et Des Couches Minces, Bd Moulay Abdellah. BP, 2390-40001, Marrakech Morocco.
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Pineau Alain
  • Pineau Alain
  • Laboratoire de Toxicologie et d?hygiene Industrielle, 1 rue Gaston Veil, 44035, Nantes Cedex, France.
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  •  Received: 13 June 2015
  •  Accepted: 16 July 2015
  •  Published: 13 August 2015

Abstract

Mining activity is one of the most important sources of heavy metals in the environment. In Marrakech region, functioning or abandoned mines represent a great hazard due to huge amounts of waste deposited in waste dumps and tailings often with high concentration of heavy metals pollution. In this study, the chemical forms of four heavy metals in mine tailings of Draa Lasfar in north-west of Marrakech city (Morocco) were studied by determining of four metals (Cd, Cu, Pb, and Zn) using standard solvent extraction and atomic absorption spectrophotometric techniques. The chemical pools of the metals indicated that the metals were distributed into six fractions with most of the metals residing in the non-residual fractions, suggesting how readily the metals are released into the environment. Results showed Cd and Cu were predominantly associated with short-term mobile fraction (F1 and F2) while Pb was largely associated with long-term mobile fraction (F3, F4 and F5) and Zn was essentially bound to Fe–Mn oxide phase (F4).

 

Key words: Heavy metal contamination, mining activity, sequential extraction, mine tailings, Marrakech – Morocco.