Technical Article

Mine Water and the Environment

, Volume 25, Issue 1, pp 56-62

First online:

The Impact of Phosphate Mine Tailings on the Bioaccumulation of Heavy Metals in Marine Fish and Crustaceans from the Coastal Zone of Togo

  • K. GnandiAffiliated withResearch Group GTVD (Gestion Traitement et Valorisation des Déchets), Univ of Lome BP Email author 
  • , G. TchangbedjiAffiliated withResearch Group GTVD (Gestion Traitement et Valorisation des Déchets), Univ of Lome BP
  • , K. KilliAffiliated withResearch Group GTVD (Gestion Traitement et Valorisation des Déchets), Univ of Lome BP
  • , G. BabaAffiliated withResearch Group GTVD (Gestion Traitement et Valorisation des Déchets), Univ of Lome BP
  • , K. AbbeAffiliated withResearch Group GTVD (Gestion Traitement et Valorisation des Déchets), Univ of Lome BP

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Abstract

About 2.5 million t of sedimentary phosphorite mine tailings, highly enriched with Cd, Cr, Cu, Ni, Fe, F, and Zn, are dumped annually in the coastal waters of Togo without any pre-treatment, causing serious pollution problems in the region. We conducted bioaccumulation investigations on fish and crustaceans sampled from the polluted coastal zone. The highest concentrations of metals in fish and crustacean were found close to the tailings outfall and the values decreased further away from the source of pollution. Compared to the international reference norms for seafood given by the WHO, Cd is enriched 10 to 168 fold, Pb 20 to 107 fold, Cu up to 5 fold, Fe up to 15 fold, and F up to 3 fold.

Key words:

Bioaccumulation heavy metals marine pollution phosphorite mine tailings Togo