VERBI VEnice Research BIbliography
VERBI VEnice Research BIbliography |
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Dalla Valle, M., Sweetman, A. J., Jones, K. C., & Marcomini, A. (2002). Estimation of fluxes and reconstruction of historical trends of PCDD/Fs and PCBS in the venice lagoon. Scientific Research and Safeguarding of Venice, Corila Research Program 2001 Results, I, 411–422.
Added by: Dott. Alessandro Meggiato (28/05/2014 16:19:42) |
| Tipo di Risorsa: Articolo di Rivista Chiave di citazione BibTeX: DallaValle2002 Invia la risorsa per email ad un amico View all bibliographic details  |
Categorie: General Keywords: biologia, extend abstract corila, metabolismo, processi ambientali - Environmental Processes Creatori: Dalla Valle, Jones, Marcomini, Sweetman Collezione: Scientific Research and Safeguarding of Venice, Corila Research Program 2001 Results |
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| Abstract |
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The Venice lagoon has a long history of industrial activity and from the 1950s the inner lagoon area of Porto Marghera expanded as chemical and oil refining plants were developed. Although emissions from the industrial area have been consistently reduced because of the decline of the chemical industry and the adoption of new abatement technologies, high concentrations of PCDD/Fs, polychlorinated biphenyls (PCBs), polycyclic aromatic hydrocarbons (PAHs) and heavy metals still affect sediments, especially in the central lagoon, thus providing a potential source for the lagoon ecosystem and for human exposure, through the ingestion of seafood. Other sources are represented by atmospheric deposition, the discharge of untreated municipal effluents from the historical centre and the emissions associated with heavy aquatic traffic, due to local transportation, fishing activities, cruisers and oil tankers [Fattore et al., 1997]. Extensive sampling campaigns have been conducted in recent years, especially in the central part of the lagoon. Surface sediment, water, settleable particulate matter (SPM) and biota (clams, mussels, crabs and fishes) have all been analysed and physico-chemical data and environmental parameters have been recorded [Dalla Valle et al., 2002] (i.e. temperature, pH, organic carbon fraction in sediment and particulate matter, particulate matter concentration and fluxes). Four sites in the central lagoon were the focus of investigation, selected to represent contamination gradients. These are (Fig 1): Alberoni, close to the Malamocco Channel (site A); Sacca Sessola (site B), in an area of intense fishing activity; San Giuliano (site C), close to the mainland and to the Osellino Canal and Fusina (site D), in front of the industrial area and the industrial canals. The contaminant contribution of rivers from the catchment area and of atmospheric deposition were also investigated. The central part of the lagoon, between the Malamocco and Lido channels linking the lagoon to the Adriatic Sea, covers a water surface of ca. 132 km2 and is quite well mixed hydrologically. PCDD/F emissions are now much lower than in the past [Frignani et al., 2001], but contaminated sediment in some areas of the industrial canals and surrounding areas can act as a significant long-term secondary source of PCDD/F to elsewhere in the lagoon as it becomes transported and re-distributed. High re-suspension of bottom sediments is caused by intensive fishing for clams (Tapes Philippinarum), shipping activity and tidal currents. These processes favour high sediment-water exchange, whilst the shallow warm waters of the lagoon encourage high biological productivity and air-water exchange. Added by: Dott. Alessandro Meggiato |