Metal remobilisation during resuspension of anoxic contaminated sediment: Short-term laboratory study

The sediments of the Tagus estuary North Channel are characterised by high concentrations of trace metals and monosulphides. During dredging operations Cd, Cu and Pb were analysed in water and suspended sediments collected 50 to 100 m around the dredging point. Concentrations in both fractions fluct...

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Bibliographic Details
Published in:Water, air, and soil pollution air, and soil pollution, 2003-02, Vol.143 (1-4), p.23-40
Main Authors: CAETANO, Miguel, MADUREIRA, Maria-Joao, VALE, Carlos
Format: Article
Language:English
Subjects:
Applied sciences
Brackish
Cadmium
Chemical reactions
Contaminated sediments
Contamination
Copper
Dissolved oxygen
Dredging
Earth sciences
Earth, ocean, space
Engineering and environment geology. Geothermics
Environmental monitoring
Estuaries
Exact sciences and technology
Heavy metals
Lead
Manganese
Metal concentrations
Natural water pollution
Pollution
Pollution, environment geology
Seawaters, estuaries
Sediment pollution
Sediments
Slurries
Studies
Suspended sediments
Trace elements
Trace metals
Turbidity
Water treatment and pollution
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Summary:The sediments of the Tagus estuary North Channel are characterised by high concentrations of trace metals and monosulphides. During dredging operations Cd, Cu and Pb were analysed in water and suspended sediments collected 50 to 100 m around the dredging point. Concentrations in both fractions fluctuated randomly: 2-3 fold for Cd and Cu and 10 for Pb. Since sampling in the dredging point reflects integration of rapid chemical reactions, a short-term laboratory experiment was conducted to follow the geochemical alterations occurring in the highest turbidity sites. The experiment was monitored as a function of time over a period of 4 hr in short time intervals. Dissolved oxygen, pH, E^sub H^,AVS, SO^sub 4^^sup 2-^, Cl^sup -^ and metals were monitored in the slurry samples. Iron, Mn, Cd, Pb and Cu were determined in the dissolved fraction (
ISSN:0049-6979
1573-2932
DOI:10.1023/A:1022877120813