Document Detail


Changes in the leachability of metals from dredged canal sediments during drying and oxidation.
MedLine Citation:
PMID:  11584639     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
The behaviour of metals in canal sediments after their disposal to land has important implications for the environmental management of canal dredgings. The leaching behaviour of trace metals was investigated in a laboratory-based experiment using sediment from a canal in the UK (139 mg Zn kg-1dry sediment, 1.1 mg Cd, kg-1dry sediment 31.5 mg Cr kg-1dry sediment, 20.6 mg Cu kg-1dry sediment 48.4 mg Ni kg-1dry sediment, 43.4 mg Pb kg-1dry sediment and 7.6 mg As kg-1dry sediment). The sediment was allowed to dry. Cores (10 cm long) of the drying canal sediment were taken over a period of 12 weeks. A simple water extraction procedure was used to investigate changes in metal leachability at varying depths through the cores. Metal leachability increased over the first five weeks of drying and then subsequently decreased between weeks five and twelve, (e.g. Cd increased from approximately 0.006 to 0.018 mg/kgsediment then decreased to approximately 0.006 mg/kgsediment, Zn increased from approximately 1.5 to 3 mg/kgsediment and then decreased to approximately 1.5 mg/kgsediment). These results were combined with sulphide/sulphate ratios, which showed a decrease as the sediment dried (e.g. at 2-4 cm depth from approximately 1 to 0.49), and BCR sequential extraction data. Most metals (except Cd and As) showed a redistribution from the residual phase into more mobile phases as the sediment dried and oxidised. Metal leachability was strongly correlated with the sulphide/sulphate ratio with leachability normally increasing with decreasing sulphide/sulphate ratio. The combined results were used to infer the likely behaviour of dredged material upon disposal to land.
Authors:
S R Stephens; B J Alloway; A Parker; J E Carter; M E Hodson
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Environmental pollution (Barking, Essex : 1987)     Volume:  114     ISSN:  0269-7491     ISO Abbreviation:  Environ. Pollut.     Publication Date:  2001  
Date Detail:
Created Date:  2001-10-04     Completed Date:  2002-02-05     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  8804476     Medline TA:  Environ Pollut     Country:  England    
Other Details:
Languages:  eng     Pagination:  407-13     Citation Subset:  IM    
Affiliation:
Postgraduate Research Institute for Sedimentology, PO Box 227, University of Reading, Whiteknights, Reading RG6 6AB, UK. s.r.stephens@reading.ac.uk
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MeSH Terms
Descriptor/Qualifier:
Environmental Monitoring
Geologic Sediments / chemistry*
Metals, Heavy / chemistry*
Oxidation-Reduction
Refuse Disposal
Solubility
Transportation
Water
Water Supply
Chemical
Reg. No./Substance:
0/Metals, Heavy; 7732-18-5/Water

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


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