期刊
WATER RESEARCH
卷 41, 期 18, 页码 4251-4261出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.watres.2007.05.058
关键词
binding; heavy metals; redox potential; sediments; sequential extraction
Heavy metal binding forms for Cu, Zn and Pb were determined at four representative sediment sites in the canals of Delft (The Netherlands), using selective chemical extraction methods. Small differences (on average < 5%) were found between duplicate extraction experiments. The dominant Cu binding form was always related to sulphide and organics in the sediment. Zn was mainly bound to iron+manganese (hydr)oxides, whereas Pb was rather evenly distributed over the different labile and non-labile binding fractions. A gradual (over about 1 month) increase in redox potentials of the anaerobic sediments led to a 7-37% sediment release of the above heavy metals; this could mainly be ascribed to oxidation of the heavy metal-sulphide bindings. Part of the released heavy metals was re). Contrary to adsorbed by the labile binding phases (exchangeable and carbonate bound expectations, we found a decrease rather than an increase in the Fe+Mn (hydr)oxide binding forms. This can probably be ascribed to non-equilibrium reactions in the time span of the experiments, as well as side reactions such as complexation with humic acids and hindered precipitation reactions due to organic matter coatings. (c) 2007 Elsevier Ltd. All rights reserved.
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