La Tour du Valat

Institut de recherche pour la conservation des zones humides méditerranéennes

Titre :	Levels of tributyltin in sediments from Tagus estuary nature reserve
Auteurs :	J. M. F. Nogueira, Auteur ; B. Simplicio, Auteur ; M. H. Florencio, Auteur ; A. M. M. Bettencourt, Auteur
Type de document :	Article
Dans :	Estuaries (26(3) JUN 2003)
Article en page(s) :	798-802
Résumé :	Concentrations of tributyltin in sediments from 9 selected stations located in the upper Tagus River estuary nature reserve, Portugal, were determined. Tributyltin (TBT) concentrations in the sediments ranged from 5 to 35 ng g(-1) on a dry weight basis. The persistent TBT contamination observed in the sediments from this important European ecosystem is primarily related to shipping activities as well as the naval industrial complexes located downstream. This exploratory survey suggests that both dumping and dredging, or the effects of tidal transport of resuspended sediments, are likely the main sources for the TBT contamination observed in the upper estuary. Although the TBT contents found in the sediments studied are low relative to concentrations reported from other parts of the world, they appear to represent a potential risk for some resident marine populations.

Lundi , mardi et jeudi de 9h à 12h et de 13h à 17h00 : ouverture au public ...