Assessment of heavy metals contamination in sediments at the lake of Ahémé in southern of Benin (West Africa)

This research is carried out in order to assess the pollution level of metal in the sediments from the lake of ahémé. the physico-chemical parameters (phkcl,total organic matter,cation exchange capacity) and heavy metal concentrations (fe,zn,as,pb and cd) of surface sediments deducted from fourteen stations during two seasons has been measured by the absorption spectrophotometer dr 2800. the enrichment factor (fe) and the index of geo-accumulation (igeo) methods is used to assess the led origins and its contamination of the sediments. the results show that the quantities of zn,pb and cd are higher according to the gesamp standards for surface sediments. the fe and the igéo show that the cd is the most enriched of all the elements studied and reveal a very high contamination in sediments of all the sampled stations during the two periods. the metal elements are predominant in the lake and from the anthropogenic sources. © 2017,university of mohammed premier oujda morocco.