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Reconstruction of historical trends of PCDD/Fs and PCBs in the Venice Lagoon, Italy.

Dalla Valle, Matteo and Marcomini, Antonio and Jones, Kevin C. and Sweetman, Andy J. (2005) Reconstruction of historical trends of PCDD/Fs and PCBs in the Venice Lagoon, Italy. Environment International, 31. pp. 1047-1052. ISSN 0160-4120

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Abstract

Historical trends of PCDD/Fs and PCBs from the year 1900 have been reconstructed for the Venice Lagoon area by using a fugacity-based dynamic multimedia model. A novel approach to estimate the inputs to the system was applied. Emissions to the lagoon were estimated by studying dated sediment cores taken from salt marshes located in the lagoon area. These cores have recently proven to be a suitable tool to reconstruct the temporal trends of atmospheric deposition of POPs. According to the model, concentrations of PCBs and PCDD/Fs in air and water reflect the trends of their production and usage, peaking during the 1960s. The peaks in the sediment were delayed by 5–40 years depending on the congener. Predicted concentrations are in good agreement with experimental results. The most important input parameters, identified by a sensitivity analysis, are the degradation constants, Kow, the Henry's law constant, vapour pressure, active sediment depth, sediment resuspension, and deposition rates, and water residence time in the lagoon.

Item Type: Article
Journal or Publication Title: Environment International
Uncontrolled Keywords: Venice Lagoon ; PCDD/Fs ; PCBs ; Model ; Trend
Subjects: G Geography. Anthropology. Recreation > GE Environmental Sciences
Departments: Faculty of Science and Technology > Lancaster Environment Centre
ID Code: 21238
Deposited By: ep_ss_importer
Deposited On: 24 Dec 2008 10:01
Refereed?: No
Published?: Published
Last Modified: 26 Jul 2012 15:44
Identification Number:
URI: http://eprints.lancs.ac.uk/id/eprint/21238

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