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Behaviour of heavy metals in a mud flat of the Scheldt estuary, Belgium
Panutrakul, S.; Baeyens, W.F.J. (1990). Behaviour of heavy metals in a mud flat of the Scheldt estuary, Belgium, in: IZWO Coll. Rep. 20(1990). IZWO Collected Reprints, 20: pp. chapter 34
In: (1990). IZWO Coll. Rep. 20(1990). IZWO Collected Reprints, 20[s.n.][s.l.], more
In: IZWO Collected Reprints. Instituut voor Zeewetenschappelijk Onderzoek: Bredene. ISSN 0772-1250, more

Also published as
  • Panutrakul, S.; Baeyens, W.F.J. (1991). Behaviour of heavy metals in a mud flat of the Scheldt estuary, Belgium. Mar. Pollut. Bull. 22(3): 128-134, more

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Keywords
    Cadmium; Chemical reactions; Estuaries; Iron; Lead; Manganese; Marine pollution; Mud flats; Physicochemical properties; Sediment chemistry; Sediment pollution; Sediments; ANE, Netherlands, Westerschelde, Ballastplaat [Marine Regions]; Marine; Brackish water

Authors  Top 
  • Panutrakul, S., more
  • Baeyens, W.F.J., more

Abstract
    The Ballasplaat intertidal mud flat in the Scheldt estuary has been polluted by Cd and Pb and also high amounts of organic matter as a result of suspended matter deposition. The degree of pollution is, however, not uniform over the mud flat due to varying physico-chemical conditions (essentially variable redox profiles). Measurements of the redox profile, and the metal concentrations in the pore water, the total sediment and the fraction <63 µm combined with sequential extraction results and enrichment factors can explain the behaviour of Cd, Pb, Fe and Mn in the sediments. In a strong anoxic sediment, where sulphate reducing bacteria are active, the heavy metals are trapped as poorly soluble metal complexes while in an oxic or suboxic sediment metals tend to be redissolved due to the oxidation of organic matter, and the reduction of particulate Fe and Mn oxyhydroxides. The transportation of heavy metals across the sediment water interface is very much depending upon the physiochemical conditions of the sediment.

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