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

This research was carried out between June 2019 and May 2020. Its major 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 goal, 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 to determine their role in this process. The other physical properties, with the exception of the TOC content calculated according to the NF EN 1484 standard and the trace metals concentrations acquired in the lab according to the MA 203-Met ICP-MSMS standard, Water samples were collected and chemical characteristics were measured in situ. From the dry season to the flood season, the trace metal concentration of these fluids decreases. Due to their fundamental composition and relatively high transparency and salinity in these seasons, marine water inputs would favour a reasonably high prevalence of these trace metals in them during their dry and rainy seasons. The somewhat acidic composition of the waters of the Comoé river, as well as their poor transparency and salinity during the flood season, would work against this process. The relatively high temperature, conductivity, and oxygen content of these fluids during the research period would have been favourable to the existence of these trace metals in dissolved form .Decomposition of organic substances causes them to form. 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.

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