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Article: Magnetic properties and heavy-metal contents of contaminated seabed sediments of Penny's Bay, Hong Kong

TitleMagnetic properties and heavy-metal contents of contaminated seabed sediments of Penny's Bay, Hong Kong
Authors
KeywordsHeavy metals
Hong Kong
Magnetic susceptibility
Marine contamination
Penny's Bay
Sediment cores
Issue Date2001
PublisherPergamon. The Journal's web site is located at http://www.elsevier.com/locate/marpolbul
Citation
Marine Pollution Bulletin, 2001, v. 42 n. 7, p. 569-583 How to Cite?
AbstractMagnetic properties and heavy-metal concentrations of vibrocore samples were found to be potential indicators of shipping contamination in seabed sediments in Hong Kong Harbour. Geochemical results of 74 vibrocores located off Penny's Bay on Lantau Island revealed an enrichment of heavy metals in the upper 1-2 m of the cores within the eastern part of the study site. Whole-core magnetic susceptibility measurements also showed a greater concentration of magnetic particles in the surficial layer of these cores. A significant correlation exists between the magnetic susceptibility and the concentrations of Pb, Zn and Cu, as well as the Tomlinson pollution load index (PLI). The proximity of these cores to a major navigation fairway and an anchorage site suggests probable contamination of the surficial seabed sediments by shipping-related wastes. A study of the magnetic properties of one of the cores, VT60, revealed a difference in the magnetic properties between the contaminated and the uncontaminated sediments. Samples from the contaminated zone exhibited relatively stronger magnetic remanence and susceptibility. The two groups of samples also formed distinct trends on the hysteresis ratios plot. A level of unusually high magnetic susceptibility within the contaminated zone was attributable to the presence of strongly magnetized granules, which were probably refuse from shipping-related activities. Geochemical and magnetic results were also conducted on samples of different size-fractions from this core. The <63 μm fraction was found to contain a relatively higher magnetic susceptibility and greater heavy-metal content. Copyright © 2001 Elsevier Science Ltd.
Persistent Identifierhttp://hdl.handle.net/10722/151050
ISSN
2015 Impact Factor: 3.099
2015 SCImago Journal Rankings: 1.264
ISI Accession Number ID
References

 

DC FieldValueLanguage
dc.contributor.authorChan, LSen_HK
dc.contributor.authorNg, SLen_HK
dc.contributor.authorDavis, AMen_HK
dc.contributor.authorYim, WWSen_HK
dc.contributor.authorYeung, CHen_HK
dc.date.accessioned2012-06-26T06:16:30Z-
dc.date.available2012-06-26T06:16:30Z-
dc.date.issued2001en_HK
dc.identifier.citationMarine Pollution Bulletin, 2001, v. 42 n. 7, p. 569-583en_HK
dc.identifier.issn0025-326Xen_HK
dc.identifier.urihttp://hdl.handle.net/10722/151050-
dc.description.abstractMagnetic properties and heavy-metal concentrations of vibrocore samples were found to be potential indicators of shipping contamination in seabed sediments in Hong Kong Harbour. Geochemical results of 74 vibrocores located off Penny's Bay on Lantau Island revealed an enrichment of heavy metals in the upper 1-2 m of the cores within the eastern part of the study site. Whole-core magnetic susceptibility measurements also showed a greater concentration of magnetic particles in the surficial layer of these cores. A significant correlation exists between the magnetic susceptibility and the concentrations of Pb, Zn and Cu, as well as the Tomlinson pollution load index (PLI). The proximity of these cores to a major navigation fairway and an anchorage site suggests probable contamination of the surficial seabed sediments by shipping-related wastes. A study of the magnetic properties of one of the cores, VT60, revealed a difference in the magnetic properties between the contaminated and the uncontaminated sediments. Samples from the contaminated zone exhibited relatively stronger magnetic remanence and susceptibility. The two groups of samples also formed distinct trends on the hysteresis ratios plot. A level of unusually high magnetic susceptibility within the contaminated zone was attributable to the presence of strongly magnetized granules, which were probably refuse from shipping-related activities. Geochemical and magnetic results were also conducted on samples of different size-fractions from this core. The <63 μm fraction was found to contain a relatively higher magnetic susceptibility and greater heavy-metal content. Copyright © 2001 Elsevier Science Ltd.en_HK
dc.languageengen_US
dc.publisherPergamon. The Journal's web site is located at http://www.elsevier.com/locate/marpolbulen_HK
dc.relation.ispartofMarine Pollution Bulletinen_HK
dc.subjectHeavy metalsen_HK
dc.subjectHong Kongen_HK
dc.subjectMagnetic susceptibilityen_HK
dc.subjectMarine contaminationen_HK
dc.subjectPenny's Bayen_HK
dc.subjectSediment coresen_HK
dc.subject.meshEnvironmental Monitoringen_US
dc.subject.meshGeologic Sediments - Chemistryen_US
dc.subject.meshMagneticsen_US
dc.subject.meshMetals, Heavy - Analysis - Chemistryen_US
dc.subject.meshShipsen_US
dc.subject.meshWater Pollutants - Analysisen_US
dc.titleMagnetic properties and heavy-metal contents of contaminated seabed sediments of Penny's Bay, Hong Kongen_HK
dc.typeArticleen_HK
dc.identifier.emailChan, LS: chanls@hku.hken_HK
dc.identifier.emailYim, WWS: wwsyim@hku.hken_HK
dc.identifier.authorityChan, LS=rp00665en_HK
dc.identifier.authorityYim, WWS=rp01746en_HK
dc.description.naturelink_to_subscribed_fulltexten_US
dc.identifier.doi10.1016/S0025-326X(00)00203-4en_HK
dc.identifier.pmid11488237-
dc.identifier.scopuseid_2-s2.0-0034888132en_HK
dc.identifier.hkuros64624-
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-0034888132&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.volume42en_HK
dc.identifier.issue7en_HK
dc.identifier.spage569en_HK
dc.identifier.epage583en_HK
dc.identifier.isiWOS:000170150300017-
dc.publisher.placeUnited Kingdomen_HK
dc.identifier.scopusauthoridChan, LS=7403540528en_HK
dc.identifier.scopusauthoridNg, SL=7403358592en_HK
dc.identifier.scopusauthoridDavis, AM=7404295484en_HK
dc.identifier.scopusauthoridYim, WWS=7007024728en_HK
dc.identifier.scopusauthoridYeung, CH=36848789500en_HK

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