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Abstract

This paper reports on the results of a research which aims at assessing the pollution status of the Sacca di Goro lagoon with respect of its watershed at providing data for the validation of a contaminants fate and transport model. This assessment was necessary since contamination data on Sacca di Goro are relatively old (1987-1990). Furthermore, emphasis was placed on the concentrations of priority substances in the herbicide families since 80% of Sacca di Goro watershed is devoted to agriculture.
Selected herbicides and their metabolites were determined in the water column (see a previous EC Report by Carafa et al., 2006b), in sediments, clams and macrolagae (present report). Five seasonal sampling campaigns were performed from May 2004 to April 2005 in five station of the lagoon. Sediments (the upper 0-15 cm horizon), clams and Ulva rigida were sampled and analysed for 30 herbicides and their metabolites. Ancillary data (sediment density, porosity and organic matter) were also determined.
Relatively high concentrations of s-triazine - especially terbuthylazine - , urea herbicides – especially diuron - and alachlor were detected through the year mainly at stations M and G, which were directly influenced by the Po di Volano inflow. Among metabolites, hydroxylated compounds prevailed often with concentrations greater than those of the parental compounds.
Atrazine and simazine metabolites were from approximately 5-7 and 17-32 times concentrated in clama and Ulva, respectively. A similar trend was also observed for terbuthylazine, which is the most diffused compound among the considered contaminants.
Overall, the most commonly used herbicides are persistent and can be found several years beyond their banning. At present, commonly used herbicides follow a clear seasonal pattern, mainly with spring peaks. Although high concentrations are commonly found in aquatic biota, the highest values are below the threshold for human use of sea-foods.

Additional information

Authors: CARAFA R, European Commission, Joint Research Centre, Institute for Environment and Sustainability, Ispra (IT);WOLLGAST J, European Commission, Joint Research Centre, Institute for Environment and Sustainability, Ispra (IT);CANUTI E, European Commission, Joint Research Centre, Institute for Environment and Sustainability, Ispra (IT);DUERI S, European Commission, Joint Research Centre, Institute for Environment and Sustainability, Ispra (IT);HANKE G, European Commission, Joint Research Centre, Institute for Environment and Sustainability, Ispra (IT);EISENREICH S J, European Commission, Joint Research Centre, Institute for Environment and Sustainability, Ispra (IT);VIAROLI P, European Commission, Joint Research Centre, Institute for Environment and Sustainability, Ispra (IT);ZALDÍVAR J M, European Commission, Joint Research Centre, Institute for Environment and Sustainability, Ispra (IT)
Bibliographic Reference: EUR 22508 EN (2006), 39 pp. Free of charge
Availability: http://bookshop.europa.eu/is-bin/INTERSHOP.enfinity/WFS/EU-Bookshop-Site/en_GB/-/EUR/ViewPublication-Start?PublicationKey=LBNA22508 (Catalogue Number: LB-NA-22508-EN-C)
Record Number: 200718887 / Last updated on: 2007-03-01
Category: PUBLICATION
Original language: en
Available languages: en
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