Abstract
The Ghar El Melh lagoon is located in the Gulf of Tunis. It constituted the old mouth of the Mejerda River before the construction of dams (1950). Three cores were studied to define the role of sulfides in retaining heavy metals in the sediment. Sediments are characterized by two distinct layers with different geochemical characteristics. According to color and grain-size distribution, sediments are due to the contributions of Mejerda in the sub-base and endogenous sedimentation in the upper layer. Therefore, the two layers gave information about this phenomenon's history. Potential redox (Eh) increases with depth whereas organic carbon (TOC) and monosulfides (AVS) decrease. SEM/AVS molar ratio (reactive metals: AVS) was less than 1 revealing the importance of sulfides in scavenging metals in these sediments and essentially in the upper layer.
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