PUMA
Istituto di Scienze Marine     
Frignani M., Bellucci L., Favotto M., Albertazzi S. Pollution historical trends as recorded by sediments at selected sites of the Venice Lagoon. In: Environment International, vol. 31 (7) pp. 1011 - 1022. Pergamon-elsevier Science Ltd, 2005.
 
 
Abstract
(English)
"Polychlorinated biphenyls (PCBs), dibenzo-p-dioxins (PCDDs), dibenzofurans (PCDFs) and hexaclorobenzene (HCB) were determined in three sediment cores of the Venice Lagoon: I1, from the San Giuliano Canal that is likely the main source of pollutants for the study area; E, representing the lagoon sediment of the zone of Campalto; and M3, typical of a salt marsh environment and mostly subject to atmospheric inputs. Maximum concentrations were found in core I1: 25-1858 ngI-TE kg(-1) (PCDD/Fs), 1.7-13 mu g kg(-1) (HCB), and 107-717 mu g kg(-1) (PCBs) are surficial and peak values, respectively. The lagoon sediment (E), is much less contaminated: 24-47 ngI-TE kg(-1) for PCDD/Fs, 2.3-3.6 mu g kg(-1) for HCB, and 56-203 mu g kg(-1) for PCBs, whereas M3 shows the lowest values: 1.6-6.0 ngI-TE kg(-1) for PCDD/Fs, 0.3-0.6 mu g kg(-1) for HCB, and 7.1-39 mu g kg(-1) for PCBs. In any case, the recent trend is toward a decrease of pollutant concentration. The chronology of cores E and M3 is based on both Pb-210 and Cs-137 activity-depth profiles. The maximum concentrations of PCDD/Fs, HCB, and PCBs correspond to the years 1949, 1980, and 1968, respectively. The homologue profiles of PCDD/Fs confirm that I1 has been subject to an industrial source while the other sites also recorded significant contributions, changing over time, of octachlorinated dioxin from combustion. A comparison of the pollutant inventories, all normalised to Pb-210 inventories, suggests that the atmospheric contribution to the contamination of the area of Campalto is low: the upper limits range from 6% (PCDD/Fs) to 17% (HCB). (C) 2005 Elsevier Ltd. All rights reserved."
DOI: 10.1016/j.envint.2005.05.011
Subject sediments
pollution
sources
chronology
Venice Lagoon


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