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Monthly variation of trace metals in North Sea sediments. From experimental data to modeling calculations
Lourino-Cabana, B; Billon, G; Lesven, L; Sabbe, K.; Gillan, D.C.; Gao, Y.; Leermakers, M.; Baeyens, W. (2014). Monthly variation of trace metals in North Sea sediments. From experimental data to modeling calculations. Mar. Pollut. Bull. 87(1-2): 237-246. dx.doi.org/10.1016/j.marpolbul.2014.07.053
In: Marine Pollution Bulletin. Macmillan: London. ISSN 0025-326X; e-ISSN 1879-3363
Peer reviewed article  
Available in  Authors 
    Vlaams Instituut voor de Zee: Open Marine Archive 279012 [ download pdf ]
Keyword
    Marine/Coastal
Author keywords
    Sediment; Porewater; Trace metals; Sulfides; Thermodynamic calculations;Seasonal effect
Authors  Top 
  • Lourino-Cabana, B
  • Billon, G
  • Lesven, L
  • Sabbe, K.
  • Gillan, D.C.
  • Gao, Y.
  • Leermakers, M.
  • Baeyens, W.
Abstract
    Seasonal variation in trace metal contamination in surface sediments was studied through high resolution profiles assessed monthly by DGT probes in muddy sediments of the North Sea. General parameters such as pH, temperature, dissolved oxygen and sulfides were also recorded to estimate their role in the speciation of trace metals. Experimental data were included in a thermodynamic equilibrium model to calculate major (geo)chemical processes at the water-sediment interface and to predict the fate of the trace metals in case of (physico-)chemical changes. Results showed lowest Fe, Co, Ni and Cd concentrations in summer, which are most probably due to the very high sulfide concentrations according to our theoretical calculations. Cu and Pb behavior were found to be less influenced by sulfides, since they are also strongly associated to organic matter. The whole set of results clearly indicated that metal speciation in these sediments is controlled by sulfides and OM contents.
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