SEASONAL DYNAMICS OF TRACE METALS IN THE WATERS FROM THE LAGOON AREA II OF ÉBRIÉ SYSTEM (CÔTE ......

This research was carried out between June 2019 and May 2020. Its main goal was to track the seasonal dynamics of As, Cd, Cr, Cu, Fe, Mn, Hg, Pb, Ni, and Zn in the Ébrié system's lagoon area II. To that purpose, the seasonal dynamics of temperature, pH, salinity, conductivity, transparency, dissolved oxygen content, and TOC content of these fluids, as well as the mean depth of this ecosystem, were investigated in order to determine their role in this process. The remaining physical and chemical parameters were assessed in situ in the water samples collected, with the exception of TOC content determined according to NF EN 1484 standard and trace metals concentrations obtained according to MA 203-Met ICP-MSMS standard in the lab. From the dry season to the flood season, the trace metal concentration of these fluids decreases. Due to their basic composition and relatively high transparency and salinity in these seasons, marine water inputs would favour a relatively high presence of these trace metals in them during their dry and rainy seasons. Because of the slightly acidic nature of the Comoé River's waters, as well as their poor transparency and salinity during the flood season, this procedure would be hampered. The relatively high temperature, conductivity, and oxygen content of these waters during the research period would have been conducive to the presence of these trace metals in dissolved form in them due to organic matter breakdown. The relatively high organic matter concentration of these waters, as well as the ecosystem's shallow depth, would have hampered this process throughout the research period.

Please see the link :- https://www.ikprress.org/index.php/JOGEE/article/view/7441