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Marinas located at the land-sea interface, are both subject to autochthonous sources of pollution and form a receptacle for terrigenous inputs from upstream areas resulting in the qualitative degradation. The objective of this project is to carry out a diagnosis of the chemical and microbiological contamination of the waters of the 4 ports located in the Gulf of Aigues Mortes (France) concerning a mutualized dredging operation. The originality of the results lies in the fact that they will allow not only to compare the chemical and microbiological qualities of the waters of the marinas, but also to determine the impact of the same type of dredging on the resuspension of contaminants in the water column

<p>Chemistry of groundwater is heavily affected by water-rocks interactions. Major elements in groundwater provide valuable indications on main aquifer rock types but requires strong lithological contrasts. Carbonate rocks differ because of deposit conditions and diagenesis and it bears significant implications for groundwater flow. It is established that trace elements in carbonates depend on deposit environment and diagenesis (Gholami Zadeh et al., 2019; Hood et al., 2018; Li et al., 2020). In waters from carbonate aquifers, variation of trace elements contents is observed at different spatial and temporal scales (Dematteis, 1995; Morgantini et al., 2010; Schürch et al., 2004). While some of this variability is due to recharge characteristics, in the absence of anthropic contamination the main process affecting trace elements contents is water-rock interactions. This leads to the potential for trace elements to be a natural tracer of limestone rock types.</p><p>This work aims to develop a natural tracer of limestone rock types that could distinguish the fingerprints of the different sub-reservoirs of carbonate aquifers.</p><p>To this purpose, we studied the Fontaine de Vaucluse karst system (southern France). It has a large recharge area (~ 1160km<sup>2</sup>; Ollivier, 2020) composed of Upper Barremian limestones of inner/outer platform, slope and basinal environnements (Masse and Fenerci-Masse, 2011; Léonide et al., 2012). We analysed major and trace elements of a set of 107 rock samples representative of the complete lithologie, facies and rock type properties of these carbonates. We also performed a one-year sampling campaign on 17 flow points: 12 in unsaturated zone from the LSBB gallery (lsbb.cnrs.fr), 3 springs, 1 stream losses, and at the main outlet of the karst system. In addition to trace elements we also monitored major elements, stables isotopes, TOC and fluorescence of natural organic matter.</p><p>A hierarchical clustering was performed with trace element contents of rock samples. It splits data into four groups according to facies description (inner/outer platforms, slope, basin). In water, first results show temporal and spatial variation of trace elements of Fontaine de Vaucluse system.</p><p>These promising results hint that trace element seem to be relevant natural tracers of the path taken by water in different limestones.</p>

Environmental contaminations can sometimes be difficult to measure, particularly in complex matrices such as seawater. This is the case of organotin compounds (OSn) such as the monobutyltin (MBT), dibutyltin (DBT), and tributyltin (TBT), whose range of polarity is wide. These compounds, mostly coming from antifouling paints used on ship shell, can be found in water and sediments where they are stable and can persist for years. Passive sampling is gaining in interest to offer solutions to monitor these kinds of compounds even in low concentrations. However, due to the diversity of pollutants present in the environment nowadays, it is important to propose solutions that allow a specific sampling. This work aims to highlight the usability of molecularly imprinted polymers (MIPs) in passive sampling for the monitoring of OSn. MIPs were synthetized using three synthesis ways (bulk, suspension, and mini-emulsion processes) and kinetics were realized in order to estimate the retention of OSn by the solid MIP phase. Results highlighted a good retention of OSn with mean retention kinetic constants near 10−5, 10−6 and 10−7 L·ng·s−1 for DBT, TBT and MBT respectively. The synthesis mode showed no impact on retention kinetics, therefore, bulk synthesis is recommended because of its simplicity. If the elimination of OSn from MIPs is to be optimized, the retention of OSn on MIPs has been demonstrated, and is very promising for their use in specific passive samplers.