The aim of this study is to assessment the effects of the seasonal water inputs on the seasonal dynamic of trace metals in the superficial sediments from the lagoon area II of Ébrié system. This study was implemented during one year (from June 2020 to May 2021) and all the physical and chemical parameters of these sediments, used in this study, were all obtained according to AFNOR standards. In hot season, the trace metal contents of these sediments, dominated by coarse sands in all seasons, were on the whole favored by the marine inputs; which would induce their very slightly basicity and reduce characters, low salinity and conductivity. However, the majority of their trace metals content decreases in rainy season with the meteorite inputs; would induce their slightly acidic and oxidizing characters and, the increase in their salinity and conductivity. These were again for the slightly basic and reduce characters of the open waters at the interface water-sediment, as their relative important salinity, conductivity and organic matter content in this season. The same effects were observed in flood season but a less marked by the important presence of Comoé river in this ecosystem.
The aim of this study was to the assessment of the seasonal level metal contamination of the superficial sediments from the lagoon area II and to deduce the likely seasonal ecological risks which results. This study were conducted during one year (from June 2020 to May 2021) and the concentration in eight trace metals (As, Cd, Cr, Cu, Hg, Pb, Ni and, Zn) of these substrates, obtained in this period, were used. Seven metal contamination indexes, six ecological risks indexes and, two sediment qualities guidelines were used for this purpose. The results highlighted the very severe contamination of these superficial sediments in all season by all these trace metals in the whole, especially by As, Cd and Hg. So, the seasonal ecological risks for its fauna, particularly for its benthic fauna, were very severe. The population of its benthic fauna threatened by this pollution was relatively important, to 21% in this period.
This study was carried out over the period from June 2019 to May 2020. Its main objective was to monitor the seasonal dynamics of As, Cd, Cr, Cu, Fe, Mn, Hg, Pb, Ni and Zn in the waters of the lagoon area II of Ébrié system. To this end, the study of the seasonal dynamics of the temperature, pH, salinity, conductivity, transparency, dissolved oxygen content and TOC content of these waters, as well as the mean depth of this ecosystem, was also studied with the aim of approaching their implication in this process. With the exception of the TOC content determined according to NF EN 1484 standard and the trace metals contents obtained according to MA 203-Met ICP-MSMS standard in the lab, the other physical and chemical parameters were determined in situ in the water samples collected. The trace metals contents of these waters decrease from its dry season to its flood season. The marine water inputs would favour a relatively high presence of these trace metals in them in their dry and rainy seasons, due to their basic character and their relatively high transparency and salinity in these seasons. The waters of Comoé river would partially disadvantage this process in its flood season, due to the slightly acidic character and low transparency and salinity of these waters in this season. Over all the study period, the relatively high temperature, conductivity, and oxygen content of these waters would have been conducive to the presence of these trace metals in dissolved form in them through the decomposition of organic matter. The relatively important organic matter content of these waters and the relatively shallow depth of this ecosystem would have disadvantaged this process over all the study period.
The assessments of the seasonal metal pollution, as well as the subsequent likely ecological and health risks, of the open waters from the lagoon area II of Ébrié system were the subject of this study. For this purpose, the seasonal mean of As, Cd, Cr, Cu, Fe, Hg, Mn, Ni, Pb, and Zn contents of these waters determined over the period from June 2020 to May 2021 were used. The water quality guidelines SEQ-Eau (version 2) and NQE DCE-UE 2018/240 were used to assess the seasonal ecological quality of these waters. As for the seasonal biota health risks, they have been assessed with the water quality guidelines of NYSDEC, US-EPA and SAVEX. Those concerning to Human health risks, they were with WQSSW of Port Gamble S'Klallam tribe. The results showed an important ecological degradation of these waters in all seasons. This has been due to As, Cd, Hg, Ni, and Pb. The likely biota health risks are also significant in all seasons, due to As, Hg, Ni, and Pb. As for the likely Human health risks, they are also important in all seasons. They are due to As, Hg, and Ni over the study period.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.
customersupport@researchsolutions.com
10624 S. Eastern Ave., Ste. A-614
Henderson, NV 89052, USA
This site is protected by reCAPTCHA and the Google Privacy Policy and Terms of Service apply.
Copyright © 2025 scite LLC. All rights reserved.
Made with 💙 for researchers
Part of the Research Solutions Family.