This work presents the results of two years monitoring of organics and trace metals in seawater with passive sampling techniques in the area around the wreck of the Costa Concordia cruise ship, which sank off the Mediterranean island of Giglio (Italy) on January 2012. The aim was to monitor bioavailable contaminants released by the wreck and/or produced by the removal yard (Parbuckling project). Sampling was carried out at three sites from May 2012 to September 2014, one month after the removal of the wreck. Two sites were fixed in the vicinity of wreck, at the bow and at the aft of the ship; the third one was located in an unexposed beach of the island. Nine sampling campaigns were carried out. In each station a canister containing semipermeable membrane devices (SPMDs) and polar organic chemical integrative samplers (POCIS) was deployed at 10 m. depth, fixed at a buoy by scuba divers. Furthermore, at each canister, 9 diffusive gradients in thin films (DGTs) devices were attached. DGTs with three different resins have been used: Chelex-100 for Cd, Cr, Cu, Ni, and Pb; Fe-oxide for V; Spheron-thiol for Hg. Deployment time for all samplers ranged from 5 to 7 weeks. Repeatability was checked by the exposure of triplicate samplers. SPMDs and POCIS were extracted and analyzed for target compounds by GC/MS. Trace metals accumulated by DGTs were analyzed after elution by GFAAS. Mercury was determined with a direct mercury analyzer. SPMDs allowed the determination of dissolved PAHs, NPD, PCBs, OCPs, and PBDEs. POCIS were used to measure endocrine disruptors, such as alkylphenols, alkylphenol ethoxylates (APEs), and steroids. The results show higher concentrations of PAHs in the station near the bow of the ship, all along the monitoring period. A significant correlation with V measured by DGTs was pointed out, indicating a contamination by oil, more likely as a result of the yard activities. This work is part of a larger monitoring plan financially supported by the Italian Civil Protection.
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|Titolo:||Passive sampling monitoring of trace metals and organics in seawater in the area of the Costa Concordia disaster (Isola del Giglio, Italy).|
|Data di pubblicazione:||2015|
|Tipologia:||4.2 Abstract in Atti di convegno|