Dynamics of trace metals in a shallow coastal ecosystem : insights from the Gulf of Gabès (southern Mediterranean Sea) - Archive ouverte HAL Access content directly
Journal Articles Aims Environmental Science Year : 2019

Dynamics of trace metals in a shallow coastal ecosystem : insights from the Gulf of Gabès (southern Mediterranean Sea)

Abstract

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.
Fichier principal
Vignette du fichier
Chifflet et al 2019 - AIMS.pdf (554.85 Ko) Télécharger le fichier
Origin : Publisher files allowed on an open archive
Loading...

Dates and versions

hal-02184270 , version 1 (15-07-2019)

Identifiers

Cite

Sandrine Chifflet, Marc Tedetti, Hana Zouch, Rania Fourati, Hatem Zaghden, et al.. Dynamics of trace metals in a shallow coastal ecosystem : insights from the Gulf of Gabès (southern Mediterranean Sea). Aims Environmental Science, 2019, 6 (4), pp.277-297. ⟨10.3934/environsci.2019.4.277⟩. ⟨hal-02184270⟩
214 View
156 Download

Altmetric

Share

Gmail Facebook Twitter LinkedIn More