Assessment of trace metal contamination and phosphorus dynamic in sediments of Monastir Bay (Tunisia) Amina Ben Mefteh University of Tunis, Tunisia Valérie Mesnage CNRS, France Sarra Ben Jeddi University of Tunis, Tunisia Mohamed-Amine Helali University of Tunis, Tunisia Noureddine Zaaboub INSTM, Tunisia Jean-Marie Barrois CNRS, French National Centre for Scientific Research, France Walid Oueslati University of Tunis, Tunisia This is a section of Ninth International Symposium “Monitoring of Mediterranean Coastal Areas: Problems and Measurement Techniques”(DOI: 10.36253/979-12-215-0030-1) by Laura Bonora, Donatella Carboni, Matteo De Vincenzi, Giorgio Matteucci Firenze University Press Firenze 2022 https://doi.org/10.36253/979-12-215-0030-1.34

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The Metallic Trace Elements were measured in the sediment, their concentrations highlighted a moderate pollution despite the human activities (urban-wastewater, harbour, textile industries). The phosphorus dynamic is controlled by environmental conditions, (i) oxic sediment with basic pH enhance the FeOOH formation then the phosphorus fixation on FeOOH or CaCO3 in sediment whatever the sediment lithology and (ii) anoxic and acidic sediment enhance the formation of ROP (Residual Organic Phosphorus) in correlation with the presence of aquatic plants (Posidonia meadow) in the sediment.

 Coastal Lagoon Tunisia Metallic Trace Elements Phosphorus particulate fractions Principal Components Analysis

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