Seasonal variation of metallic trace elements (MTE) in oyster soft tissues, Crassostrea gasar at three bays of Ebrié lagoon, Abidjan, COTE D’IVOIRE

Abstract

The assessment of the state of health of the Ebrié lagoon through the analysis of five ETMs (Zn, Cu, Pb, Cr and Cd) by the berries of Azito, M'badon and Koumassi (Cote d'ivoire) in the soft tissues of Oysters, Crassostrea gasar. Seasonal samples were taken from December 2015 to December 2016. Physico-chemical parameters such as pH, salinity and temperature were measured. The average concentrations of MTE show that Azito Bay is the most contaminated. As for the lowest concentrations, they are obtained at the bay of M'badon. Comparisons made on the basis of the seasons showed significant differences. Berries are more concentrated in Pb, Cr and Cd during the low-water season only, while Zn and Cu are more abundant during the rain and flood seasons.