African Journal of
Environmental Science and Technology

  • Abbreviation: Afr. J. Environ. Sci. Technol.
  • Language: English
  • ISSN: 1996-0786
  • DOI: 10.5897/AJEST
  • Start Year: 2007
  • Published Articles: 1126

Full Length Research Paper

Long term effect of municipal solid waste amendment on soil heavy metal content of sites used for periurban agriculture in Ngaoundere, Cameroon

R. Adjia1*, W. M. L Fezeu1,2, J. B. Tchatchueng1, S. Sorho3, G. Echevarria4, M. B. Ngassoum1
  1National Advanced School for Agro-Processs Industries (ENSAI), Ngaoundere University, P.O. Box 455, Ngaoundere, Cameroon. 2Belisle Laboratory, 100 Fisher, Second Floor, Mont-St-Hilaire (Quebec) Canada J3G 4S6. 3National Polytechnic Institute (INP-HB), P.O. Box 1093 Yamoussoukro, Ivory Coast. 4Laboratory of Soil and Environmental Sciences (LES), E.N.S.A.I.A. – INPL, 2, avenue de la Forêt de Haye - BP 172, 54501 Vandoeuvre-lès-Nancy, France
Email: [email protected]

  •  Accepted: 16 November 2008
  •  Published: 31 December 2008



An assessment of the impact of amendment using untreated municipal solid wastes on the trace element contents of periurban areas soils was carried out in Ngaoundere. Waste samples were collected in November and soil samples were collected in November, January, April and July. Heavy metal total concentrations in urban wastes differed significantly among sites and ranged from 0.48 to 7.64 mg/kg for Cd, 38.3 to 236 mg/kg for Cu, 44.06 to 58.03 mg/kg for Ni, 117 to 528 mg/kg for Pb and 270 to 2110 mg/kg for Zn. These levels were out of the critical level for agricultural use at Camp prison (for Pb and Zn), Norvegien (for Cd, Cu and Zn), and Sabongari Gare site (for Cd, Cu and Zn). The levels of Ni in urban wastes from all sites and the levels of all heavy metals in urban wastes from Douze Poteaux site were lower than the critical level. The results revealed that the soil total concentrations of Cu, Zn, Cd and Pb were below the typical agricultural soil critical level for the soil control and out of the critical level for amended soils. The levels of Ni were found to be within the normal range at all sites. The highest available concentration of Zn (139.17 mg/kg) was found in November, Fe (843.23 mg/kg) and Pb (38.82 mg/kg) in January and Cu (19.09 mg/kg) and Ni (8.98 mg/kg) in July. The available concentrations of Cd did not differ among periods. The highest bioavailable factor (BF) of Zn, Ni and Pb was found at Douze Poteaux site and of Cd and Cu at Sabongari Gare site.


Key words: Heavy metals, soils, municipal solid wastes, amendment, bioavailability factor