During the construction of a New Bridge over the Tagus estuary 2.5 million tons of sediments were dredged, part of this quantity being contaminated material. The extension and intensity of the water turbidity associated with dredging operating varied with the tidal conditions but the resuspended material collected near the bucket dredger did not present a concentration increment in metals and PCB, when compared to the estuarine suspended sediments. The calculated distribution coefficients suggest that some contaminants in solids near the dredger were not in equilibrium with the water. A 24-hour laboratory experiment demonstrated the complexity and quickness of anoxic sediments oxidation. In such a short period of time metals in the solids change their fractionation. A second laboratory simulation showed that mussels accumulate metals and PCB congeners when placed in turbid aerated water.
Skip Nav Destination
Article navigation
Research Article|
March 01 1998
Mobility of contaminants in relation to dredging operations in a mesotidal estuary (Tagus estuary, Portugal)
Carlos Vale;
Carlos Vale
*Institute for Fisheries and Sea Research, IPIMAR, Av. Brasilia, 1400 Lisbon, Portugal
Search for other works by this author on:
Ana M. Ferreira;
Ana M. Ferreira
*Institute for Fisheries and Sea Research, IPIMAR, Av. Brasilia, 1400 Lisbon, Portugal
Search for other works by this author on:
Cristina Micaelo;
Cristina Micaelo
*Institute for Fisheries and Sea Research, IPIMAR, Av. Brasilia, 1400 Lisbon, Portugal
Search for other works by this author on:
Miguel Caetano;
Miguel Caetano
*Institute for Fisheries and Sea Research, IPIMAR, Av. Brasilia, 1400 Lisbon, Portugal
Search for other works by this author on:
Eduarda Pereira;
Eduarda Pereira
**Department of Chemistry, University of Aveiro, 3810, Aveiro, Portugal
Search for other works by this author on:
Maria J. Madureira;
Maria J. Madureira
*Institute for Fisheries and Sea Research, IPIMAR, Av. Brasilia, 1400 Lisbon, Portugal
Search for other works by this author on:
Elsa Ramalhosa
Elsa Ramalhosa
**Department of Chemistry, University of Aveiro, 3810, Aveiro, Portugal
Search for other works by this author on:
Water Sci Technol (1998) 37 (6-7): 25–31.
Citation
Carlos Vale, Ana M. Ferreira, Cristina Micaelo, Miguel Caetano, Eduarda Pereira, Maria J. Madureira, Elsa Ramalhosa; Mobility of contaminants in relation to dredging operations in a mesotidal estuary (Tagus estuary, Portugal). Water Sci Technol 1 March 1998; 37 (6-7): 25–31. doi: https://doi.org/10.2166/wst.1998.0731
Download citation file:
Sign in
Don't already have an account? Register
Client Account
You could not be signed in. Please check your email address / username and password and try again.
Could not validate captcha. Please try again.
eBook
Pay-Per-View Access
$38.00