Chifflet Sandrine, Tedetti Marc, Zouch H., Fourati R., Zaghden H., Elleuch B., Quéméneur Marianne, Karray F., Sayadi S. (2019). Dynamics of trace metals in a shallow coastal ecosystem : insights from the Gulf of Gabès (southern Mediterranean Sea). AIMS Environmental Science, 6 (4), p. 277-297. ISSN 2372-0344.
Titre du document
Dynamics of trace metals in a shallow coastal ecosystem : insights from the Gulf of Gabès (southern Mediterranean Sea)
Année de publication
2019
Auteurs
Chifflet Sandrine, Tedetti Marc, Zouch H., Fourati R., Zaghden H., Elleuch B., Quéméneur Marianne, Karray F., Sayadi S.
Source
AIMS Environmental Science, 2019,
6 (4), p. 277-297 ISSN 2372-0344
Coastal areas are sites of discharge of anthropogenic compounds, such as trace metals. In seawater, trace metals have a strong affinity for particulate organic matter or clay mineral and tend to accumulate in sediments. However, natural events and human activities can cause disturbances in surface sediments involving modification of chemical balances and contamination of surrounding waters. Here, we investigated the dynamics of trace metals in the Sfax coastal area (Gulf of Gabès, southern Mediterranean Sea), a shallow coastal ecosystem impacted by tides and submitted to urban/industrial effluents. We presented the spatial distribution of trace metals concentrations, their potential mobility in sediments and evaluated the potential sources of target elements in surface waters. The highest concentration levels in surficial sediments (3.51 µg/g) and surface waters (0.25 µg/L) were found for Cd. The latter showed a great affinity (50%) for the exchangeable phase while other elements (Cu, Cr and Ni) were found in most residual phases, reducing the environmental risk. Pb and Zn, associated Fe/Mn oxyhydroxides revealed potential inputs from urban and industrial effluents. Multivariate statistical analysis suggested that dissolved trace metals in surface waters were probably derived from effluents/wadis but also from sediment resuspension processes, induced by natural (tides, hydrodynamics) or anthropogenic (dredging) events. Overall, this study highlights the importance of the interactions between sediment and water column for the trace metal dynamics in very shallow coastal environments with an exacerbated pattern for Cd.
Plan de classement
Milieux physico-chimique [032MILPHY]
;
Géochimie [064GEOCHI]
Descripteurs
GEOCHIMIE ; ZONE COTIERE ; ELEMENT EN TRACE ; MATIERE EN SUSPENSION ; EAU DE SURFACE ; SEDIMENT ; PROTECTION DE L'ECOSYSTEME ; POLLUTION CHIMIQUE ; IMPACT SUR L'ENVIRONNEMENT
Description Géographique
TUNISIE ; MEDITERRANEE
Localisation
Fonds IRD [F B010076302]
Identifiant IRD
fdi:010076302
